10 Communication

The value of the protocol address (COM1 SD2542, COM2 SD2592) and the protocol modification flag (COM1 SD2543, COM2 SD2593) can be directly set according to the command parameters.

39

40

The specific calculation formula for setting the protocol modification flag (COM1 SD2543, COM2 SD2593) is: (parameter setting value + offset of the corresponding serial port's initial special soft component + 10)*2

41

42

For example, setting the protocol to 2 is (2 +2593-2590 +10)*2, which is (2+3+10) *2=30. At this time, SD2592 will be set to 1, and SD2593 will be set to 32.

43

44

(% class="box infomessage" %)

45

(((

46

**✎Note: **Whether it is by self-calculation and then modifying the setting value of the identifier (COM1 SD2543, COM2 SD2593) to the protocol, or using this instruction to set, it is possible to modify the protocol when the PLC is in the RUN state.

47

)))

48

49

Regarding the protocol modification flags (COM1 SD2543, COM2 SD2593): During the RUN process, the first cycle of setting the protocol and modifying the flags is correct (judging at END) to the correct first cycle. When the modification is completed, the protocol modification flags (COM1 SD2543, COM2 SD2593) is cleared, and then set the same value will not be processed. Mainly to avoid repeated settings multiple times.

**Agreement Number**

(% class="table-bordered" %)

54

|**Agreement Number**|**Content**

55

|0 H|Wecon Modbus slave

56

|2 H|ModbusRTU slave

57

|3 H|ModbusASCII slave

58

|10 H|User-defined protocol

59

|20 H|ModbusRTU master station

60

|30 H|ModbusASCII master

61

62

**Related software components**

63

64

(% class="table-bordered" %)

65

|**Devices**|**Content**

66

|SD2542|COM1 protocol settings

67

|SD2543|COM1 protocol modification sign

68

|SD2592|COM2 protocol settings

69

|SD2593|COM2 protocol modification sign

70

71

(% class="box infomessage" %)

(((

**✎Note:**

The setting of communication parameters will affect the overall communication. The processing in the PLC is to modify it when there is no communication or after a round of communication is completed. This point needs attention.

76

)))

77

78

If the set protocol does not match the provided protocol number, the protocol modification flag (COM1 SD2543, COM2 SD2593) will not be cleared after setting. At this time, the protocol will not be set successfully, and it will run according to the original protocol.

**Error code**

(% class="table-bordered" %)

83

|**Error code**|**Content**

84

|4085H|The read address of (s) and (N) exceeds the device range

|4084H|(N) is not 1

**Example**

(% style="text-align:center" %)

90

[[image:10_html_2947ba20da1d1c90.png||class="img-thumbnail"]]

Example above

M1 changes from OFF to ON during the run

95

96

SD2592 will be set to 32 (20H), SD2593 will be set to 90 and then it will be cleared. At this time, it means that the setting is successful.

97

98

(% style="text-align:center" %)

99

[[image:10_html_38333ed8624e86d1.png||class="img-thumbnail"]]

100

101

If you turn M1 from OFF to ON again

102

103

SD2592 will be set to 32 (20H), SD2593 will be set to 90 but will not be cleared.

104

105

(% style="text-align:center" %)

106

[[image:10_html_54692bd97d6e3bfd.png||class="img-thumbnail"]]

107

108

= **Modbus serial port parameter setting** =

109

110

== {{id name="_PORTPARA/MODBUS串口参数设置"/}}{{id name="_Toc1121"/}}{{id name="_Toc11010"/}}**PORTPARA/Modbus serial port parameter setting** ==

**PORTPARA(P)**

Set (s) serial port parameters for (N) communication port.

-[PORTPARA (s) (N)]

**Content, range and data type**

119

120

(% class="table-bordered" %)

121

122

|(s)|Serial port parameters to be set|-|Unsigned BIN 16 bit|ANY16

123

|(N)|Which communication port to set, 0 means COM1, 1 means COM2|0, 1|Unsigned BIN 16 bit|ANY16

**Device used**

(% class="table-bordered" %)

128

|(% rowspan="2" %)**Instruction**|(% rowspan="2" %)**Parameter**|(% colspan="10" %)**Devices**|(((

**Offset**

**modification**

)))|(((

**Pulse**

**extension**

)))

|**KnY**|**KnM**|**KnS**|**T**|**C**|**D**|**R**|**SD**|**K**|**H**|**[D]**|**XXP**

138

|(% rowspan="2" %)ECAMCUT|Parameter 1|●|●|●|●|●|●|●|●|●|●|●|●

139

|Parameter 2|●|●|●|●|●|●|●|●|●|●|●|●

**Features**

This instruction is mainly used to set serial port parameters during run, and can also be used in the first cycle of run.

144

145

Can directly set the serial port parameter address (COM1 SD2540, COM2 SD2590) and the value of the serial parameter modification flag (COM1 SD2541, COM2 SD2591) according to the command parameters.

146

147

The specific calculation formula for setting the serial port parameter modification flags (COM1 SD2541, COM2 SD2591) is: (parameter setting value + offset of the corresponding serial port's initial special soft component + 10)*2

148

149

For example, setting the COM1 serial port parameter to 193 (HC1) is (193 +2541-2540 +10)*2 which is (193 +1+10) *2=408. At this time, 193 (HC1) will be set for SD2540 and 408 for SD2541.

150

151

(% class="box infomessage" %)

152

(((

153

**✎Note: **Whether it is by self-calculation and then to the serial port parameter to modify the flag (COM1 SD2541, COM2 SD2591) setting value, or use this instruction to set, it is possible to modify the serial port parameter when the PLC is in the RUN state.

154

)))

155

156

About serial port parameter modification flags (COM1 SD2541, COM2 SD2591): During RUN, when the serial port parameters are set and the modified flag is correct (judging at END) to the correct first cycle, the serial port parameter modification flag (COM1 SD2541, COM2, SD2591) are cleared, and then set the same value will not be processed. Mainly to avoid repeated settings multiple times.

157

158

**Serial port parameter setting table**

159

160

(% class="table-bordered" %)

161

|(% colspan="2" %)**Bit number**|**B0**|**B1、B2**|**B3**|**B4、B5、B6、B7、B8、B9**|**B10**|**B11**

162

163

|(% rowspan="2" %)**Content**|**0 off**|7bit|(% rowspan="2" %)(((

b2,b1

(0,0):None

(0,1):Odd parity(ODD)

169

170

(1,1):Even parity(EVEN)

171

)))|1bit|(% rowspan="2" %)(((

|4800|0111

|9600|1000

|19200|1001

|38400|1010

|57600|1011

|115200|1100

|187500|1101

|230400|1110

|460800|1111

|921600|10000

)))|Turn off STX function|Turn off ETX function

183

|**1 on**|8bit|2bit|Enable STX function, the specific value is set by D8124|Turn on the ETX function, the specific value is set by D8125

184

185

**Related software components**

186

187

(% class="table-bordered" %)

188

|**Devices**|**Content**

189

|SD2540|COM1 serial port parameter setting

190

|SD2541|COM1 serial port parameter modification identification

191

|SD2590|COM2 serial port parameter setting

192

|SD2591|COM2 serial port parameter modification sign

193

194

(% class="box infomessage" %)

195

(((

196

**✎Note:** The setting of communication parameters will affect the overall communication. The processing in the PLC is to be modified when there is no communication or after a round of communication is completed. This point needs attention.

197

198

STX function and ETX function are only useful in the case of custom protocol.

199

)))

200

201

If the set protocol does not match the provided protocol number, the serial port parameter modification flags (COM1 SD2541, COM2 SD2591) will not be cleared after setting. At this time, the protocol will not be set successfully, and it will run according to the original protocol.

**Error code**

(% class="table-bordered" %)

206

|**Error code**|**Content**

207

|4085H|The read address of (s) and (N) exceeds the device range

208

|4084H|(N) is not 0 or 1

**Example**

(% style="text-align:center" %)

213

[[image:10_html_4a65cac3b7fac971.png||class="img-thumbnail"]]

Example above

M1 changes from OFF->ON during run

218

219

SD2540 will be set to 129 (H81, baud rate: 9600, stop bit: 1, data bit: 8, parity bit: none), SD2541 will be set to 280 and then cleared. At this time it has been set successfully

220

221

(% style="text-align:center" %)

222

[[image:10_html_6c71076e92745b55.png||class="img-thumbnail"]]

223

224

If you turn M1 from OFF->ON again

225

226

SD2540 will be set to 129 (H81), SD2541 will be set to 280 but will be cleared.

227

228

(% style="text-align:center" %)

229

[[image:10_html_b19182554f11878c.png||class="img-thumbnail"]]

230

231

= {{id name="_Toc18012"/}}**{{id name="_Toc31925"/}}Modbus station number setting** =

232

233

== {{id name="_Toc27385"/}}**{{id name="_Toc31405"/}}STATION/Modbus station number setting** ==

**STATION(P)**

Under the Modbus slave station protocol. Set the station number (s) for the (N) communication port.

-[STATION (s) (N)]

**Content, range and data type**

242

243

(% class="table-bordered" %)

244

245

|(s)|Station number to be set|0 to 255|Unsigned BIN 16 bit|ANY16

246

|(N)|Which communication port to set 0 means COM1, 1 means COM2|0, 1|Unsigned BIN 16 bit|ANY16

**Device used**

(% class="table-bordered" %)

251

|(% rowspan="2" %)**Instruction**|(% rowspan="2" %)**Parameter**|(% colspan="10" %)**Devices**|(((

**Offset**

**modification**

)))|(((

**Pulse**

**extension**

)))

|**KnY**|**KnM**|**KnS**|**T**|**C**|**D**|**R**|**SD**|**K**|**H**|**[D]**|**XXP**

261

|(% rowspan="2" %)ECAMCUT|Parameter 1|●|●|●|●|●|●|●|●|●|●|●|(% rowspan="2" %)●

262

|Parameter 2|●|●|●|●|●|●|●|●|●|●|●

**Features**

●This instruction is mainly used to set the station number during run, and it can also be used in the first cycle of run.

267

268

●The value of the station number address (COM1 SD2544, COM2 SD2594) and the station number modification flag (COM1 SD2545, COM2 SD2595) can be directly set according to the command parameters.

269

270

●The specific calculation formula for setting the station number modification flag (COM1 SD2545, COM2 SD2595) is: (parameter setting value + offset of the corresponding serial port's initial special device + 10)*2

271

272

●For example, setting the COM2 station number to 1 is (1 +2595-2590 +10)*2, which is (1 +5+10) *2=32. At this time, SD2594 will be set to 1, and SD2595 will be set to 32.

273

274

**✎Note: **Whether it is by self-calculation and then modifying the ID (COM1 SD2545, COM2 SD2595) setting value to the station number, or setting with this instruction, the station number can be modified when the PLC is in the RUN state.

275

276

●Regarding station number modification identification (COM1 SD2545, COM2 SD2595): During RUN, when the station number is set and the modification identification is correct (judgment at END) to the correct first cycle, the station number will be modified when the modification is completed (COM1 SD2545, COM2 SD2595) are cleared, and then set the same value will not be processed. Mainly to avoid repeated settings multiple times.

277

278

**Related software components**

279

280

(% class="table-bordered" %)

281

|**Devices**|**Content**

282

|SD2544|COM1 station number setting

283

|SD2545|COM1 station number modification sign

284

|SD2594|COM2 station number setting

285

|SD2595|COM2 station number modification sign

**Error code**

(% class="table-bordered" %)

290

|**Error code**|**Content**

291

|4085H|The read address of (s) and (N) exceeds the device range

292

|(% rowspan="2" %)4084H|(s) not in the range of 0 to 255

|(N) is not 0 or 1

**✎Note:**

The setting of communication parameters will affect the overall communication. The processing in the PLC is to modify it when there is no communication or after a round of communication is completed. This point needs attention.

**Example**

(% style="text-align:center" %)

302

[[image:10_html_687577f8e28f9089.png||class="img-thumbnail"]]

Example above

M1 changes from OFF->ON during run

307

308

SD2594 will be set to 2, SD2595 will be set to 34 and then it will be cleared. At this time it has been set successfully

309

310

(% style="text-align:center" %)

311

[[image:10_html_b474623d8ed5305f.png||class="img-thumbnail"]]

312

313

If you turn M1 from OFF->ON again

314

315

SD2594 will be set to 2, SD2595 will be set to 34 but will not be cleared.

316

317

(% style="text-align:center" %)

318

[[image:10_html_309b7cb63c6f5d1b.png||class="img-thumbnail"]]

319

320

= {{id name="_Toc1836"/}}**{{id name="_Toc10711"/}}{{id name="_Toc29509"/}}{{id name="_Toc5112"/}}RS instruction** =

321

322

== {{id name="_Toc10635"/}}**{{id name="_Toc16249"/}}{{id name="_Toc17183"/}}{{id name="_Toc29599"/}}RS/External communication instruction** ==

**RS**

In the case of Modbus master station protocol: This instruction is the setting interface for the master station to send protocol frames. The function code (s), slave address (m), length (d) of the station number set according to the instruction, and the function code determines whether the data of n is required to be automatically combined to send and receive protocol frames. If it is a read type function code, the data will be written into (N).

327

328

-[RS (s) (m) (d) (N)]

329

330

**{{id name="_Toc26963"/}}Content, range and data type**

331

332

In the case of user-defined protocol:

333

334

(% class="table-bordered" %)

335

336

|(s)|The start address of register area that stores the data to be sent|-|Unsigned BIN 16 bit|ANY16

337

|(m)|The length of data to be sent (bytes)|0 to 523|Unsigned BIN 16 bit|ANY16

338

|(d)|The device start number that stores the written data|-|Unsigned BIN 16 it|ANY16

339

|(N)|Number of data written (bytes)|0 to 523|Unsigned BIN 16 bit|ANY16

340

341

In the case of Modbus protocol:

342

343

(% class="table-bordered" %)

**Data type**

**(label)**

)))

|(s)|The high byte stores the station number of slave station, and the low byte stores function code of Modbus|-|Unsigned BIN 16 bit|ANY16

350

|(m)|Slave address. The address provided by the slave station will read or write data from this address of the slave station|-|Unsigned BIN 16 bit|ANY16

351

|(d)|Length. The length of Modbus read or write. The unit is determined by function code.|-|Unsigned BIN 16 bit|ANY16

352

|(N)|Start address for reading or writing data|-|Unsigned BIN 16 bit|ANY16

353

354

{{id name="_Toc26776"/}}{{id name="_Toc17529"/}}**Device used**

355

356

(% class="table-bordered" %)

**Pulse**

**extension**

)))

|**T**|**C**|**D**|**R**|**K**|**H**|**[D]**|**XXP**

363

|(% rowspan="4" %)RS|Parameter 1|●|●|●|●|●|●| |

364

|Parameter 2|●|●|●|●|●|●| |

365

|Parameter 3|●|●|●|●|●|●| |

366

|Parameter 4|●|●|●|●|●|●| |

367

368

**{{id name="OLE_LINK409"/}}(1) {{id name="_Toc13811"/}}Custom protocol**

369

370

When the communication protocol is set as a [[custom protocol>>url:http://dict.cn/self-defined%20protocol]]. When the contact in before RS instruction is turned on and SM2591 is also turned on at the same time, if the sending length (m) is not 0, the data of (s) will be sent (m) bytes out, and then it will be in the mode of waiting for reception. When the data is received, (N) bytes of data will be stored in (d). SM2593 will be turned ON after receiving (N) data.

371

372

In addition, when the sending length (m) is 0, it will be in the receive-only mode. When the receiving length (N) is 0, it will be in the send-only mode.

373

374

To enable the start character (STX) and the end character (ETX) modes of RS instruction, the status of the 10th and 11th bits of the special address SD2600 must be set. See the table below for detailed settings:

375

376

(% class="table-bordered" %)

377

|(% colspan="2" %)**Bit number**|**B0**|**B1、B2**|**B3**|(((

**B4、B5、B6、**

**B7、B8、B9**

)))|**B10**|**B11**

|(% rowspan="2" %)**Content**|(((

**0**

**off**

)))|7-bit|(% rowspan="2" %)(((

b2, b1

(0,0): None

(0,1): Odd parity (ODD)

393

394

(1,1): Even parity (EVEN)

395

)))|1-bit|(% rowspan="2" %)(((

|9600|001000

|19200|001001

|38400|001010

|57600|001011

|115200|001100

|187500|001101

|230400|001110

|460800|001111

|921600|010000

)))|None|None

|(((

**1**

**on**

)))|8-bit|2-bit|Turn on STX, the STX value is set in SD2600|Turn on ETX, the ETX value is set in SD2601

**Example**

(% style="text-align:center" %)

415

[[image:10_html_dbd00c955b74b44.png||class="img-thumbnail"]]

416

417

When M1 is ON, the sending and receiving data of communication after executing instruction is stored as the following figure.

418

419

(% style="text-align:center" %)

420

[[image:10_html_fa670961ae3e6f05.gif||class="img-thumbnail"]]

421

422

Some configuration and preparation of serial communication are needed for actual programming to communicate as expected, such as setting the transceiver mode of serial port, baud rate, number of bits, parity, software protocol settings, timeout judgment conditions, and data preparation for the transceiver buffer, send and receive flag processing, etc.,

423

424

A relatively complete RS communication setup program is shown as follows:

425

426

(% style="text-align:center" %)

427

[[image:10_html_487e57593173359e.png||class="img-thumbnail"]]

428

429

(((

430

Serial port parameters settings:

431

432

Baud rate 112500, stop bit 1, data bit 8, parity bit none

)))

(((

Set the protocol as a custom protocol

437

438

Sending interval: 5ms

439

440

Receiving timeout: 100ms

441

442

Number of repetitions: 3 times

443

444

Timeout between characters: 30ms

445

446

Custom protocol, send start address D200, sending length 8, receive start address D300, receiving length 8,

447

448

Receive start address D300 Receive length 6

449

450

Send directly after trigger

451

452

After receiving, close the instruction directly and reset the instruction receiving flag

453

)))

454

455

For detailed user-defined protocol instructions, please refer to "__[[10.7.1 Custom protocol description>>path:#_10.7.1 Custom protocol description]]__"

456

457

**{{id name="_Toc24060"/}}(2) Modbus protocol**

458

459

When the protocol is set to Modbus master protocol (whether it is RTU or ASCII). When the contact before RS instruction is turned ON, the RS instruction will send the combined data frame according to the station number function code (s), slave station address (m), length (d) and judge whether the data of (N) is needed according to the function code.

460

461

(% style="text-align:center" %)

462

[[image:10_html_9d0ddca3305d21b0.png||class="img-thumbnail"]]

463

464

(% class="table-bordered" %)

465

|**Parameter**|**Content**

466

|(s)|The high byte stores the station number of slave station, and the low byte stores the function code of Modbus

467

|(m)|Slave address. The address provided by the slave station will read or write data from this address of the slave station

468

|(d)|Length, the length of Modbus read or write. The unit is determined by the function code.

469

|(N)|Start address for reading or writing data

470

471

(% style="text-align:center" %)

472

[[image:10_html_a7e64b4f4526b73e.png||class="img-thumbnail"]]

473

474

(((

475

Serial port parameter setting

476

477

Baud rate 115200, data bit 8, parity bit none, stop bit 1

478

479

Communication protocol setting: ModbusRTU master station protocol

480

481

Sending interval: 5ms

482

483

Receiving timeout: 100ms

484

485

Timeout retry times: 3 times

486

487

Station number 01H, function code 03H, slave address 10, length 05

488

)))

489

490

As the ladder program shown above:

491

492

When M1 is turned ON, PLC will send data (hexadecimal) from COM2 of PLC: 01 03 00 0A 00 05 A5 C8

493

494

01: represents slave address, the upper 8 bits of (s);

495

496

03: Modbus instruction code, the lower 8 bits of (s), meaning to read the slave register;

497

498

00 0A: The address of slave register to be read, the value of (m);

499

500

00 05: The number of registers to be read, the value of (d),

501

502

A5 C8: CRC check code.

503

504

For detailed custom protocol instructions, please refer to "[[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)__10.7.2 Modbus protocol description__>>path:#_10.7.2 Modbus protocol description]](%%)"

**✎Note: **

Although the RS instruction currently allows all the parameters of the instruction to use constants such as K and H, there are different restrictions depending on the protocol.

509

510

When the protocol is a custom protocol, S and D cannot be constants, otherwise it will report (3189H) error.

511

512

When the protocol is Modbus protocol, n cannot be a constant, otherwise it will report (3189H) error.

513

514

The combination of RTU protocol and 7-bit data bits cannot be set.

515

516

If the serial port parameter settings are different, it may still be able to communicate. At present, it is normal to set one.

517

518

Currently, the RS instruction cannot be used in interrupts and events.

519

520

**{{id name="_Toc8113"/}}Error code**

521

522

(% class="table-bordered" %)

523

|(% style="width:102px" %)**Error code**|(% style="width:979px" %)**Content**

524

|(% style="width:102px" %)4085H|(% style="width:979px" %)The read address of (s), (m), (d) and (N) exceed the device range.

525

|(% style="width:102px" %)3180H|(% style="width:979px" %)COM2 data reception error. There may be interference on the communication line, it is recommended to connect the ground wire.

526

|(% style="width:102px" %)3181H|(% style="width:979px" %)COM2 data reception timed out. "Check the wiring, check whether the serial port parameter settings are compatible with master and slave, check whether there is interference. Check whether the slave station is too late to respond. For this reason, you can try to increase the sending interval SD2546."

527

|(% style="width:102px" %)3182H|(% style="width:979px" %)COM2 CRC check error. There may be interference on the communication line, it is recommended to connect the ground wire.

528

|(% style="width:102px" %)3183H|(% style="width:979px" %)COM2 LRC check error. There may be interference on the communication line, it is recommended to connect the ground wire.

529

|(% style="width:102px" %)3184H|(% style="width:979px" %)The COM2 station number is incorrectly configured. Check the slave station number setting, and check whether there is any problem with the receiving and sending mechanism of slave station.

530

|(% style="width:102px" %)3185H|(% style="width:979px" %)COM2 send buffer overflow. Contact a technician if this error occurs

531

|(% style="width:102px" %)3186H|(% style="width:979px" %)COM2 function code is wrong. Check whether the set function code is a function code supported by PLC

532

|(% style="width:102px" %)3187H|(% style="width:979px" %)COM2 address is wrong. Check whether the slave station has this address (please refer to Modbus Abnormal 02)

533

|(% style="width:102px" %)3188H|(% style="width:979px" %)The length of COM2 is wrong. Check whether the communication length exceeds the length range specified by the Modbus protocol, or whether it exceeds the specified length range of the custom protocol.

534

|(% style="width:102px" %)3189H|(% style="width:979px" %)COM2 data error. "Check whether there are errors in the parameters of the instruction. Check whether the slave station supports the setting of this value. (Please refer to Modbus Abnormal 03)"

535

|(% style="width:102px" %)318AH|(% style="width:979px" %)COM2 slave station is busy. Slave station returns information: Slave station is busy (please refer to Modbus exception 06)

536

|(% style="width:102px" %)318BH|(% style="width:979px" %)COM2 slave station does not support function codes. Check whether the slave station supports this function code (please refer to Modbus exception 01)

537

|(% style="width:102px" %)318CH|(% style="width:979px" %)COM2 slave station is faulty. Slave station returns information: Slave station is faulty, please check whether the slave station is faulty (please refer to Modbus Abnormal 04)

538

|(% style="width:102px" %)318DH|(% style="width:979px" %)COM2 slave station confirmation. Slave station return information: slave station confirmation (please refer to Modbus abnormal 05)

539

|(% style="width:102px" %)318EH|(% style="width:979px" %)COM2 current protocol does not support this instruction or function. The related conmunication instruction of master station or the function of maste station cannot be used when it is set to slave station protocol, please change the protocol or close the contact before the corresponding instruction or diable the corresponding communication function.

540

|(% style="width:102px" %)318FH|(% style="width:979px" %)COM2 sending timed out. Contact a technician if this error occurs

541

|(% style="width:102px" %)31A0H|(% style="width:979px" %)COM2 is not available as a gateway. Slave station returns information: unavailable gateway (please refer to Modbus exception 0A)

542

|(% style="width:102px" %)31A1H|(% style="width:979px" %)COM2 indicates that no response was obtained from the target device. Slave station returns information: the device is not in the network (please refer to Modbus exception 0B)

543

544

= {{id name="_Toc3328"/}}**{{id name="_Toc27516"/}}{{id name="_Toc32747"/}}RS2 instruction** =

545

546

== **RS2/External communication instruction** ==

**RS2**

In custom protocol: This instruction is a communication send and receive instruction. It takes out (M) of the initial data specified (s) and send it, and stores (N) of the data received through the serial port in (d) and sent by (n1) automatic communication port.

551

552

In Modbus master station protocol: This instruction is the setting interface for the master station to send protocol frames. According to the station number function code (s), slave address (m), length (d) set by the instruction, and the function code to determine whether n data is required to automatically combined sending and receiving protocol frames. If it is a read type function code, the data would be written to (N) and sent by (n1) custom communication port.

553

554

-[RS2 (s) (m) (d) (N) (n1)]

555

556

**Content, range and data type**

In custom protocol

(% class="table-bordered" %)

In Modbus protocol

(% class="table-bordered" %)

571

572

|=(s)|(% style="width:517px" %)The high byte stores the station number of slave station, and the low byte stores function code of Modbus|(% style="width:114px" %)-|(% style="width:173px" %)Unsigned BIN 16 bit|(% style="width:185px" %)ANY16

573

|=(m)|(% style="width:517px" %)Slave address. The address provided by the slave station will read or write data from this address of the slave station|(% style="width:114px" %)-|(% style="width:173px" %)Unsigned BIN 16 bit|(% style="width:185px" %)ANY16

574

|=(d)|(% style="width:517px" %)Length. The length of Modbus read or write. The unit is determined by function code.|(% style="width:114px" %)-|(% style="width:173px" %)Unsigned BIN 16 bit|(% style="width:185px" %)ANY16

**Device used**

(% class="table-bordered" style="width:1078px" %)

581

|=(% rowspan="2" style="width: 116px;" %)**Instruction**|=(% rowspan="2" style="width: 101px;" %)**Parameter**|=(% colspan="7" style="width: 496px;" %)**Devices**|=(% style="width: 175px;" %)(((

582

**Offset modification**

583

)))|=(% style="width: 187px;" %)(((

**Pulse extension**

)))

**Features**

Parameter (n1) is the specified port. Curently, k0 indicates COM1, and k1 indicates COM2.

596

597

**(1) Custom protocol**

598

599

When the communication protocol is set as a [[custom protocol>>url:http://dict.cn/self-defined%20protocol]]. When the contact in before RS2 instruction is turned on and “sending control enable” is also turned on at the same time, and the sending length (m) is not 0, the data of (s) will be sent (m) bytes out, and then it will be in the mode of waiting for reception. When the data is received, (N) bytes of data will be stored in (d). “reception control or reception notice” will be turned ON after receiving (N) data.

600

601

In addition, when the sending length (m) is 0, it will be in the receive-only mode. When the receiving length (N) is 0, it will be in the send-only mode.

602

603

To enable the start character (STX) and the end character (ETX) modes of RS2 instruction, the status of the 10th and 11th bits of the special address “communication port setting” must be set. See the table below for detailed settings:

604

605

(% class="table-bordered" style="width:1073px" %)

**B4、B5、B6、**

**B7、B8、B9**

)))|(% style="width:207px" %)**B10**|(% style="width:213px" %)**B11**

611

612

|(% rowspan="2" style="width:85px" %)**Content**|(% style="width:69px" %)(((

**0**

**off**

)))|(% style="width:68px" %)7-bit|(% rowspan="2" style="width:181px" %)(((

b2, b1

(0,0): none

(0,1): odd parity (ODD)

622

623

(1,1): even parity (EVEN)

624

)))|(% style="width:68px" %)1-bit|(% rowspan="2" style="width:180px" %)(((

625

(% style="width:164px" %)

626

|(% style="width:83px" %)9600|(% style="width:79px" %)001000

627

|(% style="width:83px" %)19200|(% style="width:79px" %)001001

628

|(% style="width:83px" %)38400|(% style="width:79px" %)001010

629

|(% style="width:83px" %)57600|(% style="width:79px" %)001011

630

|(% style="width:83px" %)115200|(% style="width:79px" %)001100

631

|(% style="width:83px" %)187500|(% style="width:79px" %)001101

632

|(% style="width:83px" %)230400|(% style="width:79px" %)001110

633

|(% style="width:83px" %)460800|(% style="width:79px" %)001111

634

|(% style="width:83px" %)921600|(% style="width:79px" %)010000

635

)))|(% style="width:207px" %)None|(% style="width:213px" %)None

636

|(% style="width:69px" %)(((

**1**

**on**

)))|(% style="width:68px" %)8-bit|(% style="width:68px" %)2-bit|(% style="width:207px" %)Turn on STX, the STX value is set in the device of the corresponding communication|(% style="width:213px" %)Turn on ETX, the ETX value is set in the device of the corresponding communication

**Example**

(% style="text-align:center" %)

645

[[image:10_html_42196c0b440282c3.gif||class="img-thumbnail"]]

646

647

When M1 is ON, the sending and receiving data of communication after executing instruction is stored as the following figure.

648

649

(% style="text-align:center" %)

650

[[image:image-20220926140831-1.jpeg||class="img-thumbnail"]]

651

652

Some configuration and preparation of serial communication are needed for actual programming to communicate as expected, such as setting the transceiver mode of serial port, baud rate, number of bits, parity, software protocol settings, timeout judgment conditions, and data preparation for the transceiver buffer, send and receive flag processing, etc.,

653

654

A relatively complete RS communication setup program is shown as follows:

655

656

(% style="text-align:center" %)

657

[[image:10_html_1917cca86a75115b.png||class="img-thumbnail"]]

658

659

(((

660

Set the protocol to a custom protocol.

661

662

Set serial port parameter: baud rate 115200 stop bit 1, data bit 8, no parity bit

663

)))

664

665

For detailed custom protocol instructions, please refer to "__[[10.7.1 Custom protocol description>>path:#_10.7.1 Custom protocol description]]__"

666

667

**(2) Modbus protocol**

668

669

When the protocol is set to Modbus master protocol (whether it is RTU or ASCII). When the contact before RS2 instruction is turned ON, the RS2 instruction will send the combined data frame according to the station number function code (s), slave station address (m), length (d) and judge whether the data of (N) is needed according to the function code.

670

671

(% style="text-align:center" %)

672

[[image:10_html_d97afb4fe5346ca.gif||class="img-thumbnail"]]

673

674

(% class="table-bordered" %)

675

|=(% scope="row" %)**Parameter**|=**Content**

676

|=(s)|The high byte stores the station number of slave station, and the low byte stores function code of Modbus

677

|=(m)|Slave address. The address provided by the slave station will read or write data from this address of the slave station

678

|=(d)|Length. The length of Modbus read or write. The unit is determined by function code.

679

|=(N)|The start address of the data to be read or written

680

|=(n1)|Specify the communicatiom port

681

682

(% style="text-align:center" %)

683

[[image:10_html_7400bc2aa339cd6d.png||class="img-thumbnail"]]

684

685

(((

686

As the ladder program shown above:

687

688

When M1 is turned ON, PLC will send data (hexadecimal) from COM2 of PLC: 01 03 00 0A 00 05 A5 C8

689

690

* 01: represents slave address, the high 8 bits of (s);

691

* 03: Modbus command code, the low 8 bits of (s), which means to read the slave register;

692

* 00 0A: The address of slave register to be read, the value of (m);

693

* 00 05: The number of registers to be read, the value of (d),

694

* A5 C8: CRC check code.

695

)))

696

697

For detailed custom protocol instructions, please refer to "[[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)__10.7.2 Modbus protocol description__>>path:#_10.7.2 Modbus protocol description]](%%)"

**✎Note: **

* The RS2 instruction allows parameters to be represented by K and H constants, but there are different restrictions depending on the protocol.

702

* When the protocol is a custom protocol, S and D cannot be constants, otherwise it will report (3X89H) error.

703

* When the protocol is Modbus protocol, n cannot be a constant, otherwise it will report (3X89H) error.

704

* When the protocol is set to the RTU protocol, only 8 bits of data can be selected

705

* If the serial port parameter settings are different, it may still be able to communicate. However, it is recommended that the serial port parameters be the same to avoid other faults.

706

* Currently, the RS2 instruction cannot be used in interrupts and events.

**Error code**

(% class="table-bordered" %)

711

|=(% scope="row" style="width: 104px;" %)**Error code**|=(% style="width: 977px;" %)**Content**

712

|=(% style="width: 104px;" %)4085H|(% style="width:977px" %)The read address of (s), (m), (d) and (N) exceed the device range.

713

|=(% style="width: 104px;" %)4084H|(% style="width:977px" %)The parameter value exceed the specified range

714

|=(% style="width: 104px;" %)3080H|(% style="width:977px" %)COM1 data reception error. There may be interference on the communication line, it is recommended to connect the ground wire.

715

|=(% style="width: 104px;" %)3081H|(% style="width:977px" %)COM1 data reception timed out. "Check the wiring, check whether the serial port parameter settings are compatible with master and slave, check whether there is interference. Check whether the slave station is too late to respond. For this reason, you can try to increase “the sending interval".

716

|=(% style="width: 104px;" %)3082H|(% style="width:977px" %)COM1 CRC check error. There may be interference on the communication line, it is recommended to connect the ground wire.

717

|=(% style="width: 104px;" %)3083H|(% style="width:977px" %)COM1 LRC check error. There may be interference on the communication line, it is recommended to connect the ground wire.

718

|=(% style="width: 104px;" %)3084H|(% style="width:977px" %)The COM1 station number is incorrectly configured. Check the slave station number setting, and check whether there is any problem with the receiving and sending mechanism of slave station.

719

|=(% style="width: 104px;" %)3085H|(% style="width:977px" %)COM1 send buffer overflow. Contact a technician if this error occurs.

720

|=(% style="width: 104px;" %)3086H|(% style="width:977px" %)COM1 function code is wrong. Check whether the set function code is a function code supported by PLC

721

|=(% style="width: 104px;" %)3087H|(% style="width:977px" %)COM1 address is wrong. Check whether the slave station has this address (please refer to Modbus Abnormal 02)

722

|=(% style="width: 104px;" %)3088H|(% style="width:977px" %)The length of COM1 is wrong. Check whether the communication length exceeds the length range specified by the Modbus protocol, or whether it exceeds the specified length range of the custom protocol.

723

|=(% style="width: 104px;" %)3089H|(% style="width:977px" %)COM1 data error. "Check whether there are errors in the parameters of the instruction. Check whether the slave station supports the setting of this value. (Please refer to Modbus Abnormal 03)"

724

|=(% style="width: 104px;" %)308AH|(% style="width:977px" %)COM1 slave station is busy. Slave station returns information: Slave station is busy (please refer to Modbus exception 06)

725

|=(% style="width: 104px;" %)308BH|(% style="width:977px" %)COM1 slave station does not support function codes. Check whether the slave station supports this function code (please refer to Modbus exception 01)

726

|=(% style="width: 104px;" %)308CH|(% style="width:977px" %)COM1 slave station is faulty. Slave station returns information: Slave station is faulty, please check whether the slave station is faulty (please refer to Modbus Abnormal 04)

727

|=(% style="width: 104px;" %)308DH|(% style="width:977px" %)COM1 slave station confirmation. Slave station return information: slave station confirmation (please refer to Modbus abnormal 05)

728

|=(% style="width: 104px;" %)308EH|(% style="width:977px" %)COM1 current protocol does not support this instruction or function. The related conmunication instruction of master station or the function of maste station cannot be used when it is set to slave station protocol, please change the protocol or close the contact before the corresponding instruction or diable the corresponding communication function.

729

|=(% style="width: 104px;" %)308FH|(% style="width:977px" %)COM1 sending timed out. Contact a technician if this error occurs.

730

|=(% style="width: 104px;" %)30A0H|(% style="width:977px" %)COM1 is not available as a gateway. Slave station returns information: unavailable gateway (please refer to Modbus exception 0A)

731

|=(% style="width: 104px;" %)30A1H|(% style="width:977px" %)COM1 indicates that no response was obtained from the target device. Slave station returns information: the device is not in the network (please refer to Modbus exception 0B)

732

|=(% style="width: 104px;" %)3181H|(% style="width:977px" %)COM2 data reception timed out. "Check the wiring, check whether the serial port parameter settings are compatible with master and slave, check whether there is interference. Check whether the slave station is too late to respond. For this reason, you can try to increase the “sending interval".

733

|=(% style="width: 104px;" %)3182H|(% style="width:977px" %)COM2 CRC check error. There may be interference on the communication line, it is recommended to connect the ground wire.

734

|=(% style="width: 104px;" %)3183H|(% style="width:977px" %)COM2 LRC check error. There may be interference on the communication line, it is recommended to connect the ground wire.

735

|=(% style="width: 104px;" %)3184H|(% style="width:977px" %)The COM2 station number is incorrectly configured. Check the slave station number setting, and check whether there is any problem with the receiving and sending mechanism of slave station.

736

|=(% style="width: 104px;" %)3185H|(% style="width:977px" %)COM2 send buffer overflow. Contact a technician if this error occurs.

737

|=(% style="width: 104px;" %)3186H|(% style="width:977px" %)COM2 function code is wrong. Check whether the set function code is a function code supported by PLC.

738

|=(% style="width: 104px;" %)3187H|(% style="width:977px" %)COM2 address is wrong. Check whether the slave station has this address (please refer to Modbus Abnormal 02)

739

|=(% style="width: 104px;" %)3188H|(% style="width:977px" %)The length of COM2 is wrong. Check whether the communication length exceeds the length range specified by the Modbus protocol, or whether it exceeds the specified length range of the custom protocol.

740

|=(% style="width: 104px;" %)3189H|(% style="width:977px" %)COM2 data error. "Check whether there are errors in the parameters of the instruction. Check whether the slave station supports the setting of this value. (Please refer to Modbus Abnormal 03)"

741

|=(% style="width: 104px;" %)318AH|(% style="width:977px" %)COM2 slave station is busy. Slave station returns information: Slave station is busy (please refer to Modbus exception 06)

742

|=(% style="width: 104px;" %)318BH|(% style="width:977px" %)COM2 slave station does not support function codes. Check whether the slave station supports this function code (please refer to Modbus exception 01)

743

|=(% style="width: 104px;" %)318CH|(% style="width:977px" %)COM2 slave station is faulty. Slave station returns information: Slave station is faulty, please check whether the slave station is faulty (please refer to Modbus Abnormal 04)

744

|=(% style="width: 104px;" %)318DH|(% style="width:977px" %)COM2 slave station confirmation. Slave station return information: slave station confirmation (please refer to Modbus abnormal 05)

745

|=(% style="width: 104px;" %)318EH|(% style="width:977px" %)COM2 current protocol does not support this instruction or function. The related conmunication instruction of master station or the function of maste station cannot be used when it is set to slave station protocol, please change the protocol or close the contact before the corresponding instruction or diable the corresponding communication function.

746

|=(% style="width: 104px;" %)318FH|(% style="width:977px" %)COM2 sending timed out. Contact a technician if this error occurs.

747

|=(% style="width: 104px;" %)31A0H|(% style="width:977px" %)COM2 is not available as a gateway. Slave station returns information: unavailable gateway (please refer to Modbus exception 0A)

748

|=(% style="width: 104px;" %)31A1H|(% style="width:977px" %)COM2 indicates that no response was obtained from the target device. Slave station returns information: the device is not in the network (please refer to Modbus exception 0B)

749

750

= **Expansion module communication** =

751

752

== {{id name="_Toc15142"/}}**{{id name="_Toc7013"/}}{{id name="_Toc4135"/}}Single word data writing from TO/PLC to the module (16-bit specification)** ==

**TO(P)**

Write the data at the start (N) point of the device specified in (s3) to the buffer memory in the intelligent function module specified in (s1) after the address specified in (s2).

757

758

-[TO (s1) (s2) (s3) (N)]

759

760

**{{id name="OLE_LINK401"/}}Content, range and data type**

761

762

(% class="table-bordered" %)

763

764

|(s1)|(% style="width:419px" %)Module number, the first module is 0, the second module is 1, and so on|(% style="width:152px" %)0 to 32767|(% style="width:228px" %)Unsigned BIN 16 bit|(% style="width:177px" %)ANY16

**Device used**

(% class="table-bordered" %)

772

|(% rowspan="2" %)**Instruction**|(% rowspan="2" %)**Parameter**|(% colspan="10" %)**Devices**|(((

**Offset**

**modification**

)))|(((

**Pulse**

**extension**

)))

|**KnY**|**KnM**|**KnS**|**T**|**C**|**D**|**R**|**SD**|**K**|**H**|**[D]**|**XXP**

782

|(% rowspan="4" %)TO|Parameter 1|●|●|●|●|●|●|●|●|●|●|●|●

783

|Parameter 2|●|●|●|●|●|●|●|●|●|●|●|●

784

|Parameter 3|●|●|●|●|●|●|●|●|●|●|●|●

785

|Parameter 4|●|●|●|●|●|●|●|●|●|●|●|●

**Features**

Write the data at the start (N) point of the device specified in (s3) to the buffer memory in the intelligent function module specified in (s1) after the address specified in (s2).

790

791

(% style="text-align:center" %)

792

[[image:10_html_603a54a4bdbc6b8f.gif||class="img-thumbnail"]]

793

794

As the following Circuit program

795

796

(% style="text-align:center" %)

797

[[image:10_html_9d053b1a8c234094.png||class="img-thumbnail"]]

798

799

Indicates that when X1 is ON, write the data in the PLC's D220 register to the buffer register (BFM) #24 in the #1 (second) special module. When X1 is OFF, no operation is performed.

800

801

Currently LX5VPLC supports 16 special expansion modules at the same time.

802

803

The special devices used are as follows

804

805

(% class="table-bordered" %)

806

|**Devices**|**Content**

807

|SD2081|Total number of modules

808

|SD2082|Number of IO expansion modules

809

|SD2083|Number of special expansion modules

810

|SD2084|The first missing expansion module. When the value is -1, it means not lost

**Error code**

(% class="table-bordered" %)

815

|**Error code**|**Content**

816

|4085H|The read addresses of (s1), (s2), (s3) and (N) exceed the device range

817

|4084H|(s1) and (s2) is not in the range of 0 to 32767 or (N) is not in the range of 0 to 512

818

|7080H|Check error when communicating between PLC and module

819

|7081H|Expansion module communication message is abnormal

820

|7082H|FROM/TO instruction error

821

|7083H|The specified extension module was not found

**Example**

(% style="text-align:center" %)

826

[[image:10_html_936412ccc04cc4cb.png||class="img-thumbnail"]]

When M1 is turned on

The values of D200 and D201 will be passed to BFM2 and BFM3 of module #0 (the first)

831

832

(% style="text-align:center" %)

833

[[image:10_html_555c0224c9a9e02d.png||class="img-thumbnail"]]

834

835

(% style="text-align:center" %)

836

[[image:10_html_ab29c2a6c272559.png||class="img-thumbnail"]]

837

838

== **Double word data write from DTO/PLC to the module (32-bit specification)** ==

DTO(P)

Write the data of (N)×2 points from the device specified in (s3) to the buffer memory in the intelligent function module specified in (s1) and beyond the address specified in (s2).

843

844

-[DTO (s1) (s2) (s3) (N)]

845

846

**Content, range and data type**

847

848

(% class="table-bordered" %)

**Device used**

(% class="table-bordered" %)

858

|(% rowspan="2" %)**Instruction**|(% rowspan="2" %)**Parameter**|(% colspan="12" %)**Devices**|(((

**Offset**

**modification**

)))|(((

**Pulse**

**extension**

)))

|**KnY**|**KnM**|**KnS**|**T**|**C**|**D**|**R**|**SD**|**LC**|**HSC**|**K**|**H**|**[D]**|**XXP**

868

|(% rowspan="4" %)DTO|Parameter 1|●|●|●|●|●|●|●|●| | |●|●|●|●

869

|Parameter 2|●|●|●|●|●|●|●|●| | |●|●|●|●

870

|Parameter 3|●|●|●|●|●|●|●|●|●|●|●|●|●|●

871

|Parameter 4|●|●|●|●|●|●|●|●| | |●|●|●|●

**Features**

Write the data of (N)×2 points from the device specified in (s3) to the buffer memory in the intelligent function module specified in (s1) and beyond the address specified in (s2).

876

877

(% style="text-align:center" %)

878

[[image:10_html_86bfbd89b2652fbf.gif||class="img-thumbnail"]]

879

880

As the following Circuit program

881

882

(% style="text-align:center" %)

883

[[image:10_html_d3dfe7b80f649f8e.png||class="img-thumbnail"]]

884

885

Indicates that when M1 is ON, write the data in the PLC's D200 and D201 registers to the buffer registers (BFM) #1 and #2 in the #0 (first) special module. When X1 is OFF, no operation is performed.

886

887

Currently LX5V PLC supports 16 special expansion modules at the same time.

888

889

The special devices used are as follows

890

891

(% class="table-bordered" %)

892

|**Devices**|**Content**

893

|SD2081|Total number of modules

894

|SD2082|Number of IO expansion modules

895

|SD2083|Number of special expansion modules

896

|SD2084|The first missing expansion module. When the value is -1, it means not lost

**Error code**

(% class="table-bordered" %)

901

|**Error code**|**Content**

902

|4085H|(s1) (s2) (s3) (N) The read address exceeds the device range

903

|4084H|(s1) (s2) is not in the range of 0 to 32767 or (N) is not in the range of 0 to 256

904

|7080H|Check error when communicating between PLC and module

905

|7081H|Expansion module communication message is abnormal

906

|7082H|FROM/TO instruction error

907

|7083H|The specified extension module was not found

**Example**

(% style="text-align:center" %)

912

[[image:10_html_12ff08a3df52558c.png||class="img-thumbnail"]]

When M1 is turned on

The values from D200 to D203 will be transferred to BFM1 to BFM4 of module #0 (first)

917

918

(% style="text-align:center" %)

919

[[image:10_html_fe06c272cbdd1f7f.png||class="img-thumbnail"]]

920

921

(% style="text-align:center" %)

922

[[image:10_html_adeb00a341e12368.png||class="img-thumbnail"]]

923

924

== {{id name="_Toc9726"/}}**{{id name="_Toc721"/}}{{id name="_Toc151"/}}{{id name="_Toc25394"/}}FROM/Read single word data from the module (16-bit specification)** ==

**FROM(P)**

Read (N) word data from the buffer memory specified in (s2) in the module specified in (s1), and store it in the device specified in (d) and later.

Ladder

-[FROM (s1) (s2) (d) (N)]

933

934

**Content, range and data type**

935

936

(% class="table-bordered" %)

937

938

|(s1)|(% style="width:473px" %)Module number, the first module is 0, the second module is 1, and so on|(% style="width:134px" %)0 to 32767|(% style="width:185px" %)Unsigned BIN 16 bit|(% style="width:180px" %)ANY16

**Device used**

(% class="table-bordered" style="width:1098px" %)

946

|=(% rowspan="2" style="width: 76px;" %)**Instruction**|=(% rowspan="2" style="width: 114px;" %)**Parameter**|=(% colspan="10" style="width: 490px;" %)**Devices**|=(% style="width: 218px;" %)(((

947

**Offset modification**

948

)))|=(% style="width: 119px;" %)(((

**Pulse extension**

)))

**Features**

Read (N) word data from the buffer memory specified in (s2) in the intelligent function module specified in (s1) and store it in the device specified in (d) and later.

960

961

(% style="text-align:center" %)

962

[[image:10_html_1b9d34e74f852368.gif||class="img-thumbnail"]]

963

964

As the following Circuit program

965

966

(% style="text-align:center" %)

967

[[image:10_html_ad9897d46ca8f957.png||class="img-thumbnail"]]

968

969

It means that when M1 is ON, the data in the buffer registers (BFM) #10 and #11 in the special module #0 (the first) will be written into the D200 and D201 registers of the PLC. When M1 is OFF, no operation is performed.

970

971

Currently LX5V PLC supports 16 special expansion modules at the same time.

972

973

The special soft components used are as follows:

974

975

(% class="table-bordered" %)

976

|=(% scope="row" style="width: 163px;" %)**Devices**|=(% style="width: 911px;" %)**Content**

977

|=(% style="width: 163px;" %)SD2081|(% style="width:911px" %)Total number of modules

978

|=(% style="width: 163px;" %)SD2082|(% style="width:911px" %)Number of IO expansion modules

979

|=(% style="width: 163px;" %)SD2083|(% style="width:911px" %)Number of special expansion modules

980

|=(% style="width: 163px;" %)SD2084|(% style="width:911px" %)The first missing expansion module. When the value is -1, it means not lost

**Error code**

(% class="table-bordered" %)

985

|=(% scope="row" %)**Error code**|=**Content**

986

|=4085H|(s1) (s2) (N) The read address exceeds the device range

987

|=4086H|(d) The write address exceeds the device range

988

|=4084H|(s1) (s2) is not in the range of 0 to 32767 or (N) is not in the range of 0 to 512

989

|=7080H|Check error when communicating between PLC and module

990

|=7081H|Expansion module communication message is abnormal

991

|=7082H|FROM/TO instruction error

992

|=7083H|The specified extension module was not found

**Example**

(% style="text-align:center" %)

997

[[image:10_html_a9071734dc5cfce5.png||class="img-thumbnail"]]

When M1 is turned on

The values of BFM3, BFM4, and BFM5 of the #0 (first) module will be transferred to D200, D201, D202

1002

1003

(% style="text-align:center" %)

1004

[[image:10_html_f1df0562ea9002cf.png||class="img-thumbnail"]]

1005

1006

(% style="text-align:center" %)

1007

[[image:10_html_73bb66d1890735ff.png||class="img-thumbnail"]]

1008

1009

== {{id name="_Toc18124"/}}{{id name="_Toc10981"/}}{{id name="_Toc21090"/}}**DFROM/single word data read from the module (32-bit specification)** ==

**DFROM(P)**

Read (N)*2 words of data from the buffer memory specified in (s2) in the module specified in (s1), and store it in the device specified in (d) and later.

1014

1015

-[DFROM (s1) (s2) (d) (N)]

1016

1017

**Content, range and data type**

1018

1019

(% class="table-bordered" %)

1020

1021

|=(s1)|(% style="width:473px" %)Module number, the first module is 0, the second module is 1, and so on|(% style="width:134px" %)0 to 32767|(% style="width:193px" %)Unsigned BIN 16 bit|(% style="width:172px" %)ANY16

**Device used**

(% class="table-bordered" style="width:1074px" %)

1029

|=(% rowspan="2" %)**Instruction**|=(% rowspan="2" %)**Parameter**|=(% colspan="12" %)**Devices**|=(((

**Offset**

**modification**

)))|=(% style="width: 147px;" %)(((

**Pulse**

**extension**

)))

|=**KnY**|=**KnM**|=**KnS**|=**T**|=**C**|=**D**|=**R**|=**SD**|=**LC**|=(% style="width: 40px;" %)**HSC**|=(% style="width: 55px;" %)**K**|=**H**|=**[D]**|=(% style="width: 147px;" %)**XXP**

1039

|=(% rowspan="4" %)DFROM|Parameter 1|●|●|●|●|●|●|●|●| |(% style="width:40px" %) |(% style="width:55px" %)●|●|●|(% style="width:147px" %)●

1040

|Parameter 2|●|●|●|●|●|●|●|●| |(% style="width:40px" %) |(% style="width:55px" %)●|●|●|(% style="width:147px" %)●

1041

|Parameter 3|●|●|●|●|●|●|●|●|●|(% style="width:40px" %)●|(% style="width:55px" %) | |●|(% style="width:147px" %)●

1042

|Parameter 4|●|●|●|●|●|●|●|●| |(% style="width:40px" %) |(% style="width:55px" %)●|●|●|(% style="width:147px" %)●

**Features**

Read (N)×2 words of data from the buffer memory specified in (s2) in the intelligent function module specified in (s1), and store it in the device specified in (d) and later.

1047

1048

(% style="text-align:center" %)

1049

[[image:10_html_ea4017a0483ddbbe.gif||class="img-thumbnail"]]

1050

1051

As the following Circuit program

1052

1053

(% style="text-align:center" %)

1054

[[image:10_html_6d0c9e8bc37fe95.png||class="img-thumbnail"]]

1055

1056

It means that when M1 is ON, the data in the buffer register (BFM) #10 to #13 in the special module #0 (the first) will be written to the D200 to D203 registers of the PLC. When M1 is OFF, no operation is performed.

1057

1058

Currently LX5V PLC supports 16 special expansion modules at the same time.

1059

1060

The special soft components used are as follows:

1061

1062

(% class="table-bordered" %)

1063

|=(% scope="row" %)**Devices**|=**Content**

1064

|=SD2081|Total number of modules

1065

|=SD2082|Number of IO expansion modules

1066

|=SD2083|Number of special expansion modules

1067

|=SD2084|The first missing expansion module. When the value is -1, it means not lost

**Error code**

(% class="table-bordered" %)

1072

|=(% scope="row" style="width: 140px;" %)**Error code**|=(% style="width: 934px;" %)**Content**

1073

|=(% style="width: 140px;" %)4085H|(% style="width:934px" %)(s1) (s2) (N) The read address exceeds the device range

1074

|=(% style="width: 140px;" %)4086H|(% style="width:934px" %)(d) The write address exceeds the device range

1075

|=(% style="width: 140px;" %)4084H|(% style="width:934px" %)(s1) (s2) is not in the range of 0 to 32767 or (N) is not in the range of 0 to 256

1076

|=(% style="width: 140px;" %)7080H|(% style="width:934px" %)Check error when communicating between PLC and module

1077

|=(% style="width: 140px;" %)7081H|(% style="width:934px" %)Expansion module communication message is abnormal

1078

|=(% style="width: 140px;" %)7082H|(% style="width:934px" %)FROM/TO instruction error

1079

|=(% style="width: 140px;" %)7083H|(% style="width:934px" %)The specified extension module was not found

**Example**

(% style="text-align:center" %)

1084

[[image:10_html_7389fb305b495d09.png||class="img-thumbnail"]]

When M1 is turned on

The value of BFM3 to BFM8 of module #0 (first) will be transferred to D200 to D205

1089

1090

(% style="text-align:center" %)

1091

[[image:10_html_2f6f4ddff10c30ec.png||class="img-thumbnail"]]

1092

1093

(% style="text-align:center" %)

1094

[[image:10_html_8a1de3e41b64afe1.png||class="img-thumbnail"]]

1095

1096

= {{id name="_Toc28953"/}}**{{id name="_Toc13721"/}}{{id name="_Toc14994"/}}{{id name="_Toc4655"/}}RS and RS2 instructions corresponding protocol description** =

1097

1098

== {{id name="_10.7.1 Custom protocol description"/}}**{{id name="_Toc19972"/}}{{id name="_Toc7163"/}}{{id name="_Toc25715"/}}{{id name="_Toc23891"/}}{{id name="_Toc21391"/}}{{id name="_自定义协议说明"/}}Custom protocol description** ==

1099

1100

**{{id name="_Toc28071132"/}}Introduction**

1101

1102

The function of custom protocol is that it can directly transmit data with the device without any processing or communicate with other devices with the corresponding protocol set by the customer.

1103

1104

At present, the custom protocol of 5V PLC is configured and sent by COM2, and the instruction used is RS instruction, and it need to configure the protocol and serial port parameters through the Devices.

1105

1106

The current custom protocol is generally close to 3V series.

1107

1108

**{{id name="_Toc28071133"/}}Basic configuration**

**(1) Instructions**

The RS instruction itself has the same usage as the previous RS instruction at 3V, and it can use R device.

1113

1114

-[RS (s) (m) (d) (N)]

1115

1116

**Content, range and data type**

1117

1118

(% class="table-bordered" %)

1119

1120

|(s)|The start address of the register area where the data to be sent is stored|-|Unsigned BIN 16 bit|ANY16

1121

|(m)|Is the length of the data to be sent (number of bytes)|0 to 528|Unsigned BIN 16 bit|ANY16

1122

|(d)|Start number of the device storing the written data|-|Unsigned BIN 16 bit|ANY16

1123

|(N)|Number of data written|0 to 528|Unsigned BIN 16 bit|ANY16

1124

1125

**{{id name="_Toc20319"/}}Device used**

1126

1127

(% class="table-bordered" %)

**Pulse**

**extension**

)))

|**T**|**C**|**D**|**R**|**K**|**H**|**[D]**|**XXP**

1134

|(% rowspan="4" %)RS|Parameter 1|●|●|●|●|●|●| |

1135

|Parameter 2|●|●|●|●|●|●| |

1136

|Parameter 3|●|●|●|●|●|●| |

1137

|Parameter 4|●|●|●|●|●|●| |

1138

1139

**✎Note: **Although the RS instruction currently allows all the parameters of the instruction to use constants such as K and H, there are different restrictions according to the different protocol. When the protocol is a custom protocol, S and D cannot be constants, otherwise it will report an error.

1140

1141

**{{id name="_Toc28071135"/}}(2) Special device settings**

1142

1143

Special address table

1144

1145

(% class="table-bordered" %)

1146

|(% colspan="2" %)**COM2 special D device (SD)**|(% colspan="2" %)**COM2 special M Device (SM)**

1147

|2590|__**Communication port setting**__|2590|__**Send control on**__

1148

|2591|__**Serial parameter modification identification**__|2591|__**Send control/send reminder**__

1149

|2592|Protocol settings|2592|__**Receive control on**__

1150

|2593|Protocol modification logo|2593|__**Accept control/receive prompt**__

1151

|2594|Station number setting|2594|__**8-bit mode (for custom protocol)**__

1152

|2595|Station number modification logo|2595|

1153

|2596|(((

1154

__**Sending interval (0.1ms) 0-32767**__

1155

1156

__**It is 10 (1ms) when set to 0**__

1157

)))|2596|

1158

|2597|(((

1159

__**Communication timeout setting (10ms) 0-32767**__

1160

1161

__**It is 10(100ms) when set to 0**__

1162

)))|2597|

1163

|2598|__**Timeout retry times 0-32767**__|2598|

1164

|2599|(((

1165

__**Character interval timeout setting (for custom protocol) (0.1ms)**__

1166

1167

__**0-32767 . It is 10 (1ms) when set to 0**__

1168

)))|2599|

1169

|2600|__**STX value**__|2600|

1170

|2601|__**ETX value**__|2601|

1171

|...| |...|

1172

|2610|**The amount of data received**|2610|**Communication complete flag**

1173

|2611|**Last error**|2611|**Receiving flag**

1174

|2612|**Current error**|2612|**Retry occurred**

1175

|2613|**Error steps**|2613|**Communication error**

1176

|2614|**Error station number**|2614|**Communication timeout**

1177

|2615|**Cumulative number of errors**|2615|

1178

1179

The contents that the custom protocol will be used and set has been marked with underline and bold.

1180

1181

In addition, the devices to be used as judgment conditions have also been marked in bold in the table.

1182

1183

**✎Note: **COM1 currently does not support custom protocols.

1184

1185

**{{id name="_Toc28071136"/}}1) Communication port setting SD2590**

1186

1187

(% class="table-bordered" %)

1188

|(% colspan="2" %)**Bit number**|**B0**|**B1、B2**|**B3**|(((

**B4、B5、B6、**

**B7、B8、B9**

)))|**B10**|**B11**

|(% rowspan="2" %)**Content**|**0 off**|7 bit|(% rowspan="2" %)(((

b2,b1

(0,0): None

(0,1): Odd parity (ODD)

1200

1201

(1,1): Even parity (EVEN)

1202

)))|1 bit|(% rowspan="2" %)(((

|4800|0111

|9600|1000

|19200|1001

|38400|1010

|57600|1011

|115200|1100

|187500|1101

|230400|1110

|460800|1111

|921600|10000

)))|None|None

|**1 on**|8 bit|2 bit|Turn on ETX, the ETX value is set in SD2600|Turn on ETX, the ETX value is set in SD2601

1215

1216

Set the serial port parameters to SD2590 according to the bit settings provided in the table above. The setting is roughly the same as 3V. It is mainly because the baud rate can be set to a higher baud rate, the bit used need backward two bits when STX and ETX start.

1217

1218

For example: To set the serial port parameters: baud rate 115200, stop bit 1, data bit 8, no parity bit, turn on STX, you need to set the value H4C1 (K1217) on SD2590. The parameters directly set to SD2590 are only valid in the first cycle of PLC RUN.

1219

1220

If you need to modify it during RUN, you can use the PORTPARAM instruction to set it.

1221

1222

**{{id name="_Toc28071137"/}}2) Protocol setting SD2592**

1223

1224

(% class="table-bordered" %)

1225

|(% colspan="2" %)**Protocol settings**|(% colspan="2" %)**Protocol settings**

1226

|0 H|Wecon Modbus slave station|10 H|Cunstom protocol

1227

|2 H|ModbusRTU slave station|20 H|ModbusRTU master station

1228

|3 H|ModbusASCII slave station|30 H|ModbusASCII master station

1229

1230

The corresponding protocol can be set by setting the corresponding value in SD2592.

1231

1232

The parameters directly set to SD2592 are only valid in the first cycle of PLC RUN.

1233

1234

If you need to modify it during RUN, you can use the PROTOCOL instruction to set it.

1235

1236

**{{id name="_Toc28071138"/}}3) Sending interval SD2596**

1237

1238

The main function of sending interval is: how long to wait for sending the next instruction after one instruction is completed. If the value is set to 0, there is basically no waiting for sending interval, but it will be affected by the scan cycle.

1239

1240

The unit of the sending interval is 0.1ms, that is, the interval time is 10ms when the setting is 100.

1241

1242

**{{id name="_Toc28071139"/}}4) Communication timeout SD2597 and timeout retry SD2598**

1243

1244

(% style="text-align:center" %)

1245

[[image:10_html_53f716718aad2197.png||class="img-thumbnail"]]

1246

1247

The main function of communication timeout is: How long does it take to wait for no data to be received after the PLC sends retry or occurs an error. When 0 is set, the default is 100ms.

1248

1249

The unit of communication timeout is 10ms, that is, the timeout judgment time is 10ms when the setting is 100.

1250

1251

When a receiving timeout occurs, it will determine whether there are retry times and the current retry times. If the retry times are greater than or equal to SD2598, an error will be reported.

1252

1253

If SD2598 is set to 0, it will not try again.

1254

1255

If it is set to 1, send once again after sending a timeout.

1256

1257

**{{id name="_Toc28071140"/}}5) Character interval timeout SD2599**

1258

1259

Currently this setting is only available for custom protocols.

1260

1261

The main function of the character interval timeout is: after receiving at least one character before the communication timeout, judge whether the interval time between the following two characters has exceeded. if it is, report an error and end the communication.

1262

1263

(% style="text-align:center" %)

1264

[[image:10_html_3725d523c70bd43d.png||class="img-thumbnail"]]

1265

1266

This setting is mainly designed considering that some devices may send slow or have other specific sending requirements.

1267

1268

{{id name="_Toc28071141"/}}The character interval timeout will not retry.

1269

1270

**(3) Serial port parameter setting instructions**

1271

1272

**1) Host computer interface settings**

1273

1274

(% style="text-align:center" %)

1275

[[image:10_html_3f08ef293fcbfcf1.png||class="img-thumbnail"]]

1276

1277

Through the PLC parameter setting in the upper computer interface, If protocol is set to none, it is a custom protocol.

1278

1279

The serial port parameter content mainly sets the serial port parameters such as baud rate and data bit.

1280

1281

After the start character is enabled, the start/end character can be sent. The start/end character will also be distinguished when receiving. See the description in the sending and receiving process for details.

1282

1283

**✎Note: **The characters here are decimal values.

1284

1285

**{{id name="_Toc28071142"/}}2) PORTPARA instruction**

-[PORTPARA (s) (N)]

**Content, range and data type**

1290

1291

(% class="table-bordered" %)

**Data type**

**(label)**

)))

|(s)|Serial port parameters to be set|0 to 256|Unsigned BIN 16 bit|ANY16

1298

|(N)|Which communication port to set (0 means COM1, 1 means COM2)|0, 1|Unsigned BIN 16 bit|ANY16

1299

1300

**{{id name="_Toc23976"/}}Device used**

1301

1302

(% class="table-bordered" %)

**Pulse**

**extension**

)))

|**KnY**|**KnM**|**KnS**|**T**|**C**|**D**|**R**|**SD**|**K**|**H**|**[D]**|**XXP**

1309

|(% rowspan="2" %)PROTPARA|Parameter 1|●|●|●|●|●|●|●|●|●|●|●|●

1310

|Parameter 2|●|●|●|●|●|●|●|●|●|●|●|●

1311

1312

Function: To set communication parameters when running.

1313

1314

Please refer to "PORTPARA instruction description" for details.

1315

1316

**{{id name="_Toc28071143"/}}3) PROTOCOL instruction**

-[PROTOCOL (s) (N)]

**Content, range and data type**

1321

1322

(% class="table-bordered" %)

1323

1324

|(s)|Protocol number to be set|0 to 65535|Unsigned BIN 16 bit|ANY16

1325

|(N)|Which communication port to set (0 means COM1, 1 means COM2 *1)|1|Unsigned BIN 16 bit|ANY16

1326

1327

**{{id name="_Toc1191"/}}Device used**

1328

1329

(% class="table-bordered" %)

1330

|(% rowspan="2" %)**Instruction**|(% rowspan="2" %)**Parameter**|(% colspan="10" %)**Devices**|(((

**Offset**

**modification**

)))|(((

**Pulse**

**extension**

)))

|**KnY**|**KnM**|**KnS**|**T**|**C**|**D**|**R**|**SD**|**K**|**H**|**[D]**|**XXP**

1340

|(% rowspan="2" %)PORTOCOL|Parameter 1|●|●|●|●|●|●|●|●|●|●|●|

1341

|Parameter 2|●|●|●|●|●|●|●|●|●|●|●|

**Features:**

It is used to set the communication protocol when running. The above instruction actually sets a specific value for the parameter modification flag. The specific calculation formula is: (parameter setting value + the offset of the start special device corresponding to the serial port + 10)*2

1346

1347

For example, setting the protocol to Modbusrtu master station (H20) is (0x20 +2593-2590 +10)*2, that is (32 +3+10) *2=90. This is to prevent the serial port parameters from being modified at will.

1348

1349

The trigger of setting parameters in custom protocol will not change the value until an instruction is completed.

1350

1351

The trigger of setting parameters in Modbus master station protocol won’t change the value until an instruction is completed.

1352

1353

The trigger of setting parameters in the Modbus slave protocol can be switched as long as it is not processing the received data. Please refer to "PROTOCOL instruction description" for details.

1354

1355

**4) Priority description of serial port parameters**

1356

1357

The priority of serial port parameter settings are listed as blow. The serial port parameters are saved by power failure currently.

1358

1359

Serial port parameter set instruction setting = Ladder program MOV instruction set the corresponding SD device > the download parameters of host computer > Previous power-off save data.

1360

1361

**(4) Ladder program**

1362

1363

(% style="text-align:center" %)

1364

[[image:10_html_487e57593173359e.png||class="img-thumbnail"]]

1365

1366

(((

1367

* Set serial port parameters:

1368

* Baud rate 112500, stop bit 1, data bit 8, no parity bit none

1369

* Set protocol to custom protocol

1370

* Sending interval: 5ms

1371

* Receiving timeout: 100ms

1372

* Number of repetitions: 3 times

1373

* Characters interval timeout: 30ms

1374

* Custom protocol sending start address D200, sending length 8.

1375

* Receiving start address D300, receiving length 6

1376

* Send directly after trigger

1377

* After receiving is completed, close the instruction directly and reset the instruction receiving flag

1378

)))

1379

1380

**{{id name="_Toc28071145"/}}Sending and receiving process**

1381

1382

**{{id name="_Toc28071146"/}}(1) Sending and receiving mechanism**

1383

1384

**1) **{{id name="_Toc28071147"/}}**No start character (STX) and end character (ETX)**

1385

1386

①16-bit (SM2594 is OFF)

1387

1388

The devices will be divided into high and low directly, and send data from the low address first and then the high address in order.

1389

1390

(% style="text-align:center" %)

1391

[[image:10_html_5891dcc3161d6651.png||class="img-thumbnail"]]

1392

1393

(% style="text-align:center" %)

1394

[[image:image-20220926145824-1.jpeg||height="430" width="607"]]

1395

1396

②8-bit (SM2594 is ON)

1397

1398

Get the value of the low address of device directly and send it

1399

1400

(% style="text-align:center" %)

1401

[[image:10_html_1d76c606ba1b2ba8.png||class="img-thumbnail"]]

1402

1403

(% style="text-align:center" %)

1404

[[image:10_html_a46b2be94cb51e78.png||class="img-thumbnail"]]

1405

1406

The data sent in the case of the ladder program and the data above should be 70 E1 31 62 6C.

1407

1408

(% style="text-align:center" %)

1409

[[image:10_html_1920f501fdbca9b8.png||class="img-thumbnail"]]

1410

1411

Receiving will also be stored in the lower address

1412

1413

**{{id name="_Toc28071148"/}}2) Open and set the start character STX**

1414

1415

The value of the start character SD2600 is only valid in the low bit

1416

1417

When STX is enabled, the send will start with STX. When receiving, the send will start with STX, but STX will not be displayed.

1418

1419

If it receives the STX during the receiving, the receiving will restart.

1420

1421

If the first character is not received, the timeout period is judged by the first character timeout. When a character is received, no matter what data is received, the inter-character timeout will be counted from the last character received.

1422

1423

(% style="text-align:center" %)

1424

[[image:10_html_bd054fd74ccaddc.png||class="img-thumbnail"]]

1425

1426

(% style="text-align:center" %)

1427

[[image:10_html_a46b2be94cb51e78.png||class="img-thumbnail"]]

1428

1429

For example, the result of the above ladder program and the above data sending is FE 70 7D E1 00 31.

1430

1431

Sending FE 51 26 34 15 to the PLC at this time will receive the following data. And if you send FE 25 63 FE 51 26 34 15 you will also receive the following data.

1432

1433

(% style="text-align:center" %)

1434

[[image:10_html_f2dbc2f6fb276e3f.png||class="img-thumbnail"]]

1435

1436

**{{id name="_Toc28071149"/}}3) Open and set the end character ETX situation**

1437

1438

The value of ending character SD2601 is only valid in the low bit.

1439

1440

When ETX is enabled, the send will end with ETX.

1441

1442

When ETX is received, SM2610 and SM2593 are immediately turned ON, regardless of whether sufficient length is received.

1443

1444

(% style="text-align:center" %)

1445

[[image:10_html_17fa71d20bec1531.png||class="img-thumbnail"]]

1446

1447

(% style="text-align:center" %)

1448

[[image:10_html_a46b2be94cb51e78.png||class="img-thumbnail"]]

1449

1450

For example, the result of the above Circuit program and the above data transmission is 70 7D E1 00 31 FD.

1451

1452

If the above Circuit program sends 01 06 FD to him, the following data will be received. If the FD is sent directly, it will be judged as the end directly.

1453

1454

(% style="text-align:center" %)

1455

[[image:10_html_72c7fdeee574504.png||class="img-thumbnail"]]

1456

1457

**{{id name="_Toc28071150"/}}4) Both the start character STX and the end character ETX are turned on**

1458

1459

When both are opened, it is basically a combination of the above single opened states. But if only ETX data is received when both start, it will not end immediately. It will judge the character interval time and does not start receiving data.

1460

1461

**{{id name="_Toc28071151"/}}(2) Receiving after sending (similar to Modbus master station mechanism)**

1462

1463

**{{id name="_Toc28071152"/}}1) Send control switch (SM2590) and receive control switch (SM2592) OFF (default)**

1464

1465

When the contact of RS instruction is on, turn SM2591 on and send it immediately. SM2591 will be automatically OFF immediately after sending.

1466

1467

After sending, SM2593 is ON, it will always stop at this instruction, and wait for it to be OFF and then receive data. If it is OFF, it will start to receive data.

1468

1469

After the first character timeout period (SD2597), if no character is received, it is judged as a timeout. If there are retry times, it will retry. But after retrying, the communication still does not report an error, and SM2593 and SM2614 are turned on.

1470

1471

After receiving the first character, it will judge whether that the interval between characters exceeds the time set by SD2599. If it it doesn’t. it will report an error.(For the details, please refer to [the timeout of the interval character].)

1472

1473

When there are two or more instructions, the first RS instruction which is set ON will be sent after SM2591 is ON. Later, if this RS instruction is completed*1, then turn ON, SM2591 will switch to the next RS instruction*2 in the ladder sequence.

1474

1475

When there are two or more instructions, switch to another one during the data reception and it continue to stay back in the original instruction to until the reception is complete.

**✎Note:**

**✎**Completion refers to receiving data or reporting an error.

1480

1481

**✎**If there is no other open RS instruction after the ladder sequence, it will return to the first RS instruction that was opened in the ladder sequence for execution.

1482

1483

**{{id name="_Toc28071153"/}}2) The sending way when the sending control switch (SM2590) is ON**

1484

1485

When the sending control switch (SM2590) is ON, there is no need to set SM2591 ON. At this time, as long as the contact of the RS instruction is triggered, it can be sent, and SM2591 is automatically turned ON.

1486

1487

**{{id name="_Toc28071154"/}}3) The receiving way when the receiving control switch (SM2592) is ON**

1488

1489

When the receiving control switch (SM2592) is ON, SM2593 will be OFF automatically when the instruction is executed. It will no longer judge the status of SM2593 when receiving, and SM2593 will still be turned ON after receiving.

1490

1491

**{{id name="_Toc28071155"/}}4) Sending control switch (SM2590) and receiving control switch (SM2592) ON**

1492

1493

In this case, you only need to trigger the contact before the RS instruction to send data, then it will automatically switch to the waiting status. When the reception is completed, it will turn to the next RS instruction that is turned on.

1494

1495

**{{id name="_Toc28071156"/}}(3) Send-only**

1496

1497

(% style="text-align:center" %)

1498

[[image:10_html_ee6092e0d3a61be2.png||class="img-thumbnail"]]

1499

1500

When the sending length is set to a value other than 0, and the receiving length is set to 0, it is send-only mode.

1501

1502

**{{id name="_Toc28071157"/}}1) The sending control switch (SM2590) is OFF**

1503

1504

When SM2591 is turned ON, the data will be sent without receiving.

1505

1506

When there are two or more instructions, the first RS instruction which is turned ON will be sent after SM2591 is turned ON. After this RS instruction is completed, then turn ON SM2591 will switch to the next RS instruction in the ladder program.

1507

1508

**{{id name="_Toc28071158"/}}2) The Sending control switch (SM2590) is ON**

1509

1510

The RS instruction will be sent when triggered. Multiple instructions are triggered and sent in a loop. During the sending cycle, the interval will be sent according to the set sending interval.

1511

1512

**{{id name="_Toc28071159"/}}(4) Receive-only**

1513

1514

(% style="text-align:center" %)

1515

[[image:10_html_46075eaee9d78457.png||class="img-thumbnail"]]

1516

1517

When the sending length is 0 and the receiving length is not 0, it is only receiving.

1518

1519

**{{id name="_Toc28071160"/}}1) SM2592 receiving control switch OFF**

1520

1521

SM2593 will be turned ON when receiving, and the ladder program control must be turned OFF to continue receiving. SM2593 will not turn ON without receiving data.

1522

1523

When multiple instructions are enabled to receive only at the same time, it will start to receive from the smallest number of steps in the ladder diagram. Time out or received data will be forwarded to the second to continue receiving.

1524

1525

**{{id name="_Toc28071161"/}}2) SM2592 receiving control switch ON**

1526

1527

It can receive normally and will not be controlled by the flag bit. The SM2593 receiving identifier serves as the receiving prompt identifier,and SM2593 will not turn ON without receiving data.

1528

1529

If multiple RS receive only instructions are turned on at the same time, the receiving position is uncertain due to the timeout judgment and switching to the next one.

1530

1531

**{{id name="_Toc28071162"/}}(5) Use receive-only and send-only methods to send after receiving (similar to Modbus slave mechanism)**

1532

1533

(% style="text-align:center" %)

1534

[[image:10_html_a70fbc189fa39660.png||class="img-thumbnail"]]

1535

1536

(((

1537

Receive-only: When it is determined that the reception is complete, it will determine the instruction to be triggered according to the received content, and save the received data at the same time.

1538

1539

Send-only: The content sent by triggered M2 is different from that of triggered M3. After the trigger is over, they will return to trigger the receive-only of M1.

1540

)))

1541

1542

**{{id name="_Toc28071163"/}}10.7.1.4 Error message**

1543

1544

Currently The Error code will be displayed on SD7, SD0, SD 2611 and SD2612.

1545

1546

The Error codes that will appear in the custom protocol are mainly as follows.

1547

1548

(% class="table-bordered" %)

1549

|(% style="width:106px" %)**Error code**|(% style="width:975px" %)**Content**

1550

|(% style="width:106px" %)3181H|(% style="width:975px" %)Data receiving timeout

1551

|(% style="width:106px" %)3188H|(% style="width:975px" %)Wrong length

1552

|(% style="width:106px" %)3189H|(% style="width:975px" %)COM2 data error. "Check whether there are errors in the parameters of instruction. Check whether the slave station supports the setting of this value. (Please refer to Modbus exception 03)"

1553

|(% style="width:106px" %)318EH|(% style="width:975px" %)(((

1554

Current protocol does not support this instruction

1555

1556

(This error is only displayed on SD7 and SD0)

1557

)))

1558

|(% style="width:106px" %)318FH|(% style="width:975px" %)COM2 sending timed out. Contact a technician if this error occurs

1559

|(% style="width:106px" %)3190H|(% style="width:975px" %)COM2 receiving data exceeds the buffer limit.

1560

1561

After resetting the protocol or communication parameters, the error will be cleared.

1562

1563

In addition, the communication completion/communication error/communication timeout flag will be set after the executed instruction.

1564

1565

**10.7.1.5 The difference with Mitsubishi**

1566

1567

The current differences:

1568

1569

1. STX and ETX: Mitsubishi can set up to 4 bytes, we only have one byte.

1570

1. Add sum check and CR, LF.

1571

1. The instruction control of Mitsubishi is that the first instruction triggered is fixed to execute this instruction. It will not be switched to other instructions midway, unless the contact of this instruction is closed.

1572

1573

== **Modbus protocol description** ==

**Introduction**

The Modbus master station protocol is generally close to LX3V. The address was modified in the slave station.

1578

1579

**Basic configuration**

**(1) Introduction**

The RS instruction has the same usage as the previous RS instruction of 3V, and can use R device.

1584

1585

-[RS (s) (m) (d) (N)]

1586

1587

**Content, range and data type**

1588

1589

(% class="table-bordered" %)

1590

1591

|(s)|(% style="width:589px" %)The high byte stores the station number of slave station, and the low byte stores the Modbus function code.|(% style="width:119px" %)-|(% style="width:168px" %)Unsigned BIN 16 bit|(% style="width:113px" %)ANY16

1592

|(m)|(% style="width:589px" %)Slave address. The address provided by slave station will read or write data from this address of the slave station|(% style="width:119px" %)-|(% style="width:168px" %)Unsigned BIN 16 bit|(% style="width:113px" %)ANY16

1593

|(d)|(% style="width:589px" %)Length. The length of Modbus read or write. The unit is determined by function code.|(% style="width:119px" %)-|(% style="width:168px" %)Unsigned BIN 16 bit|(% style="width:113px" %)ANY16

1594

1595

1596

**{{id name="_Toc20576"/}}Device used**

1597

1598

(% class="table-bordered" style="width:1058px" %)

**Pulse**

**extension**

)))

|**T**|**C**|**D**|**R**|**K**|(% style="width:96px" %)**H**|(% style="width:226px" %)**[D]**|**XXP**

1605

|(% rowspan="4" %)RS|Parameter 1|●|●|●|●|●|(% style="width:96px" %)●|(% style="width:226px" %) |

1606

|Parameter 2|●|●|●|●|●|(% style="width:96px" %)●|(% style="width:226px" %) |

1607

|Parameter 3|●|●|●|●|●|(% style="width:96px" %)●|(% style="width:226px" %) |

1608

|Parameter 4|●|●|●|●| |(% style="width:96px" %) |(% style="width:226px" %) |

1609

1610

**✎Note: **Although the RS instruction currently allows all the parameters of the instruction to use constants such as K and H, there are different restrictions according to the different protocols. When the protocol is Modbus master station protocol, n cannot be a constant, otherwise an error will be reported.

1611

1612

**{{id name="_Toc33979607"/}}(2) Special device setting**

1613

1614

Special address table

1615

1616

(% class="table-bordered" %)

1617

|(% colspan="2" %)**COM 1 special D device (SD)**

1618

|2540|__**Communication port settings**__

1619

|2541|__**Serial parameter modification identification**__

1620

|2542|

1621

|2543|

1622

|2544|__**Station number setting**__

1623

|2545|__**Station number modification logo**__

1624

1625

**✎Note: **COM1 does not support modifying the protocol.

1626

1627

(% class="table-bordered" %)

1628

|(% colspan="2" %)**COM2 special D device (SD)**|(% colspan="2" %)**COM2 special M Device (SM)**

1629

|2590|__**Communication port setting**__|2590|Send control start

1630

|2591|__**Serial parameter modification identifier**__|2591|**Send control/send reminder**

1631

|2592|__**Protocol setting**__|2592|Receive control start

1632

|2593|__**Protocol modification identifier**__|2593|**Receive control/receive prompt**

1633

|2594|__**Station number setting**__|2594|8-bit mode (for custom protocol)

1634

|2595|__**Station number modification identifier**__|2595|

1635

|2596|(((

1636

__**Sending interval (0.1ms) 0-32767.**__

1637

1638

__**It is 10 when set to 0 (1ms)**__

1639

)))|2596|

1640

|2597|(((

1641

__**Communication timeout setting (10ms) 0-32767**__

1642

1643

__**It is 10 when set to 0 (100ms)**__

1644

)))|2597|

1645

|2598|__**Timeout retry times 0-32767**__|2598|

1646

|2599|Character interval timeout setting (for custom protocol) (0.1ms) 0-32767. It is 10 when set to 0 (1ms)|2599|

1647

|2600|STX value|2600|

1648

|2601|ETX value|2601|

1649

|...| |...|

1650

|2610|**The amount of data received**|2610|**Communication complete flag**

1651

|2611|**Last error**|2611|**Receiving flag**

1652

|2612|**Current error**|2612|**Retry occurred**

1653

|2613|**Error steps**|2613|**Communication error**

1654

|2614|**Error station number**|2614|**Communication timeout**

1655

|2615|**Cumulative number of errors**|2615|

1656

1657

{{id name="_Toc33979608"/}}The contents that the custom protocol will be used and set has been marked with underline and bold. In addition, the devices to be used as judgment conditions have also been marked in bold in the table.

1658

1659

**1) Communication port setting SD2590**

1660

1661

(% class="table-bordered" %)

1662

|(% colspan="2" %)**Bit number**|**B0**|**B1、B2**|**B3**|**B4、B5、B6、B7、B8、B9**

1663

1664

|(% rowspan="2" %)**Content**|**0 off**|7 bit|(% rowspan="2" %)(((

b2,b1

(0,0): None

(0,1): Odd parity (ODD)

1670

1671

(1,1): Even parity (EVEN)

1672

)))|1 bit|(% rowspan="2" %)(((

|4800|0111

|9600|1000

|19200|1001

|38400|1010

|57600|1011

|115200|1100

|187500|1101

|230400|1110

|460800|1111

|921600|10000

)))

|**1 on**|8 bit|2 bit

1685

1686

Set the serial port parameters to SD2590 according to the bit settings provided in the table above. The setting is roughly the same as 3V. It is mainly because the baud rate can be set to a higher baud rate, the bit used need backward two bits when STX and ETX start.

1687

1688

{{id name="_Toc33979609"/}}For example: To set the serial port parameters: baud rate 115200, stop bit 1, data bit 8, no parity bit, you need to set the value H4C1 (K1217) on SD2590. The parameters directly set to SD2590 are only valid in the first cycle of PLC RUN. If you need to modify it during RUN, you can use the PORTPARAM instruction to set it.

1689

1690

**2) Protocol setting SD2592**

1691

1692

(% class="table-bordered" %)

1693

|(% colspan="4" %)**Protocol settings**

1694

|0 H|Wecon Modbus slave station|10 H|Custom protocol

1695

|2 H|ModbusRTU slave station|20 H|ModbusRTU master station

1696

|3 H|ModbusASCII slave station|30 H|ModbusASCII master station

1697

1698

The corresponding protocol can be set by setting the corresponding value in SD2592. The parameters directly set to SD2592 are only valid in the first cycle of PLC RUN. If you need to modify it during RUN, you can use the PROTOCOL instruction to set it. COM1 cannot use protocols other than Wecon Modbus slave station Currently.

1699

1700

**{{id name="_Toc33979610"/}}3) Sending interval SD2596**

1701

1702

The main function of sending interval is: how long to wait for sending the next instruction after one instruction is completed. If it is set to 0, there is basically no waiting for interval sending, but it will be affected by the scan cycle. The unit of the sending interval is 0.1ms, that is, the interval is 10ms when set to 100.

1703

1704

**{{id name="_Toc33979611"/}}4) Communication timeout SD2597 and timeout retry SD2598**

1705

1706

(% style="text-align:center" %)

1707

[[image:10_html_8c204d3cecb508d7.png||class="img-thumbnail"]]

1708

1709

The main function of communication timeout is: How long does it take to wait for no data to be received and then retry or report an error after the PLC sends. When it is set to 0, the default value is 100ms.

1710

1711

The unit of communication timeout is 10ms, that is, the timeout determine time is 100ms when set to 10.

1712

1713

When a receiving timeout occurs, it will determine whether there are retry times and the current retry times. If the retry times are greater than or equal to SD2598, an error will be reported.

1714

1715

If SD2598 is set to 0, it will not retry.

1716

1717

If it is set to 1, send once and then send once again after timeout.

1718

1719

(% class="wikigeneratedid" id="HSerialportparametersetting" %)

1720

**Serial port parameter setting**

1721

1722

(% class="wikigeneratedid" id="HPORTPARAinstruction" %)

1723

**PORTPARA instruction**

-[PORTPARA (s) (N)]

**Content, range and data type**

1728

1729

(% class="table-bordered" %)

**{{id name="_Toc3250"/}}Device used**

1735

1736

(% class="table-bordered" %)

1737

|(% rowspan="2" %)**Instruction**|(% rowspan="2" %)**Parameter**|(% colspan="10" %)**Devices**|(((

**Offset**

**modification**

)))|(((

**Pulse**

**extension**

)))

|**KnY**|**KnM**|**KnS**|**T**|**C**|**D**|**R**|**SD**|**K**|**H**|**[D]**|**XXP**

1747

|(% rowspan="2" %)PORTPARA|Parameter 1|●|●|●|●|●|●|●|●|●|●|●|●

1748

|Parameter 2|●|●|●|●|●|●|●|●|●|●|●|●

**Features**

Set communication parameters when used for run. Please refer to "__[[PORTPARA instruction description>>path:#_PORTPARA/MODBUS serial port parameter setting]]__" for details**.**

1753

1754

**PROTOCOL instruction**

-[PROTOCOL (s) (N)]

**Content, range and data type**

1759

1760

(% class="table-bordered" %)

1761

1762

|(s)|Protocol number to be set|0 to 65535|Unsigned BIN 16 bit|ANY16

1763

|(N)|Which communication port to set (0 means COM1, 1 means COM2 *1)|1|Unsigned BIN 16 bit|ANY16

**Device used**

(% class="table-bordered" %)

**Pulse**

**extension**

)))

|**KnY**|**KnM**|**KnS**|**T**|**C**|**D**|**R**|**SD**|**K**|(% style="width:33px" %)**H**|**[D]**|**XXP**

1774

|(% rowspan="2" %)PROTOCOL|Parameter 1|●|●|●|●|●|●|●|●|●|(% style="width:33px" %)●|●|●

1775

|Parameter 2|●|●|●|●|●|●|●|●|●|(% style="width:33px" %)●|●|●

1776

1777

**{{id name="_Toc13079"/}}Features**

1778

1779

Set the communication protocol when used for run. The instruction above actually is to set a specific value for the parameter modification flag.

1780

1781

The calculation formula is: (parameter setting value + the offset of the start special device corresponding to the serial port + 10)*2

1782

1783

For example, setting the protocol to ModbusRTU master station (H20) is (0x20 +2593-2590 +10)*2, which is (32 +3+10) *2=90. This is to prevent the serial port parameters from being modified at will. .

1784

1785

In Modbus master protocol, the trigger of setting parameters is to change the value after an instruction is completed.

1786

1787

In Modbus slave protocol, the trigger of setting parameters is that to switch as long as it is not processing the received data.

1788

1789

For details, please refer to "PROTOCOL instruction description"

1790

1791

**3) Host computer settings**

1792

1793

The PLC parameter setting of host computer can set the corresponding serial port parameters.

1794

1795

(% style="text-align:center" %)

1796

[[image:10_html_4208a2ce93bb23e7.png||class="img-thumbnail"]]

1797

1798

Specialized protocol station number cannot be 0.

1799

1800

The station number under ModbusRTU and ModbusASCII protocol is 0: the protocol sets the master station.

1801

1802

The station number under ModbusRTU and ModbusASCII protocol is not 0: the protocol sets the slave station.

1803

1804

The serial port parameters are filled in according to the content in the form.

1805

1806

**✎Note: **RTU protocol cannot set data bit of 7-bit.

1807

1808

**4)Priority description of serial port parameters**

1809

1810

The priority of serial port parameter settings are listed as blow. The serial port parameters are saved by power failure currently.

1811

1812

Serial port parameter set instruction setting = Ladder program MOV instruction set the corresponding SD device > the download parameters of host computer > Previous power-off save data.

1813

1814

**{{id name="_Toc33979615"/}}(4) Basic ladder program**

1815

1816

(% style="text-align:center" %)

1817

[[image:10_html_a7e64b4f4526b73e.png||class="img-thumbnail"]]

1818

1819

(((

1820

Serial port parameter setting

1821

1822

Baud rate 115200, data bit 8, parity bit none, stop bit 1

1823

1824

Communication protocol setting: ModbusRTU master station protocol

1825

1826

Sending interval: 5ms

1827

1828

Receiving timeout: 100ms

1829

1830

Timeout retry times: 3 times

1831

1832

Station number 01H, function code 03H, slave address 10, length 05

)))

**{{id name="_Toc33979616"/}}10.7.2.3 Send and receive process**

1838

1839

**{{id name="_Toc33979617"/}}(1) Modbus master station**

1840

1841

When programming, before each RS (Modbus mode) instruction, the assignment of each operand unit, such as the communication operation object address, operation type, operation register address, data number, sending or receiving unit, etc., is completed, once the execution starts, the system program will automatically calculate the CRC check, organize the communication frame, and complete the operation of sending data and receiving response.

1842

1843

If you use Modbus-ASC protocol communication (set SD2592 as H30), the HEX-ASC format conversion of sending and receiving data is automatically completed by the PLC system program. The RS (Modbus mode) instruction method and the Modbus-RTU protocol method are exactly the same.

1844

1845

In the plc program, if multiple RS (Modbus mode) instructions are driven, the system program will still execute the "sending, waiting for answer, receiving, verification, analysis and storage" of an RS instruction, and then perform the same process for the next RS instruction until all RS instructions are executed and then restarted. You don not need to care about the timing and process of its execution, which simplifies the PLC programming design. This is the advantage of Modbus instruction.

1846

1847

Modbus master function list

1848

1849

(% class="table-bordered" %)

1850

|**Function code**|**Function name**|**Details**

1851

|0x01|Coil readout|Coil readout (multiple points optional)

1852

|0x02|Input readout|Input and read (multiple points optional)

1853

|0x03|Holding register readout|Holding register readout(multiple points optional)

1854

|0x04|Input register readout|Input register readout (multiple points optional)

1855

|0x05|1 coil write|Coil writing (only 1 point)

1856

|0x06|1 register write|Holding register write (only 1 point)

1857

|0x0F|Batch coil write|Multi-point coil writing

1858

|0x10|Batch register write|Multi-point holding register write

1859

1860

(((

1861

Serial port parameter setting

1862

1863

Baud rate 115200, data bit 8, no parity bit, stop bit 1

Example:

)))

(% style="text-align:center" %)

1869

[[image:10_html_a7e64b4f4526b73e.png||class="img-thumbnail"]]

1870

1871

(((

1872

Communication protocol setting: ModbusRTU master station protocol

1873

1874

Sending interval: 5ms

1875

1876

Receiving timeout: 100ms

1877

1878

Timeout retry times: 3 times

1879

1880

Station number 01H, function code 03H, slave address 10, length 05

)))

As shown in the ladder program shown:

1886

1887

When M1 is turned ON, PLC will send data (hexadecimal) from COM2 of PLC: 01 03 00 0A 00 05 A5 C8

1888

1889

* 01: Slave address, the high 8 bits of (s);

1890

* 03: Modbus instruction code, the lower 8 bits of (s). It is to read the slave register;

1891

* 00 0A: The address of the slave register to be read, the value of (m);

1892

* 00 05: The number of registers to be read, the value of (d),

1893

* A5 C8: CRC check code.

**✎Note: **

When using 1 coil to write (0x05), the value used for writing 1 is 0xFF00, and the value used for writing 0 is 0x0000.

1898

1899

When using batch coil write (0x0F), pay attention to the high and low byte exchange. For example, when writing 1 length, the fourth parameter value is 1 (0x0001), which means 0 is sent. You need to write 256 (0x0100) to write 1 to the target address.

1900

1901

**{{id name="_Toc33979618"/}}(2) Modbus slave**

1902

1903

When the PLC series is used as a Modbus slave, it supports Modbus communication operation instructions such as 0x01, 0x03, 0x05, 0x06, 0x 0f, 0x10. The coils of the PLC that can be read and written include M, S, T, C, X (only Read) SM, Y, LC, HSC and other variables through these instructions. Register variables include D, T, C, R, SD, LC, HSC.

1904

1905

When the Modbus communication master accesses (reads or rewrites) the internal variables of the PLC slave, it must follow the following communication instruction frame definition and the variable address index method in order to carry out normal communication operations.

1906

1907

**{{id name="_Toc33979619"/}}1) instruction code 0x01 (01): read coil**

1908

1909

(% class="table-bordered" %)

1910

|**Serial number**|**Data (byte) meaning**|**Number of bytes**|**Instruction**

1911

|1|Slave address|1 byte|Value 1 to 247, set by SD2544, SD2594

1912

|2|0x01 (instruction code)|1 byte|Read coil

1913

|3|Coil start address|2 bytes|High bit in front, low bit in back, see coil addressing

1914

|4|Number of coils|2 bytes|High bit in front, low bit in back (N)

1915

|5|CRC check|2 bytes|Low bit in front, high bit in back

1916

1917

Response frame format: slave address + 0x01 + number of bytes + coil status + CRC check

1918

1919

(% class="table-bordered" %)

1920

|**Serial number**|**Data (byte) meaning**|**Number of bytes**|**Instruction**

1921

|1|Slave address|1 byte|Value 1 to 247, set by SD2544, SD2594

1922

|2|0x01 (instruction code)|1 byte|Read coil

1923

|3|Number of bytes|1 byte|Value: [(N+7)/8]

1924

|4|Coil state|[(N+7)/8] bytes|Every 8 coils are combined into one byte. If the last one is less than 8 bits, fill in 0 in the undefined part. The first 8 coils are in the first byte, and the coil with the smallest address is in the lowest bit. And so on

1925

|5|CRC check|2 bytes|High bit first, then low bit

1926

1927

Error response: refer to error response frame.

1928

1929

**{{id name="_Toc33979620"/}}2) instruction code 0x03 (03): read register**

1930

1931

Request frame format: slave address + 0x03 + register start address + number of registers + CRC check.

1932

1933

(% class="table-bordered" %)

1934

|**Serial number**|**Data (byte) meaning**|**Number of bytes**|**Instruction**

1935

|1|Slave address|1 byte|Value 1 to 247, set by SD2544, SD2594

1936

|2|0x03 (instruction code)|1 byte|Read register

1937

|3|Register start address|2 bytes|High bit in front, low bit in back, see register addressing

1938

|4|Number of registers|2 bytes|High bit in front, low bit in back (N)

1939

|5|CRC check|2 bytes|High bit in front, low bit in back

1940

1941

Response frame format: slave address + 0x03 + number of bytes + register value + CRC check.

1942

1943

(% class="table-bordered" %)

1944

|**Serial number**|**Data (byte) meaning**|**Number of bytes**|**Instruction**

1945

|1|Slave address|1 byte|Value 1 to 247, set by SD2544, SD2594

1946

|2|0x03 (instruction code)|1 byte|Read register

1947

|3|Number of bytes|1 byte|Value: N*2

1948

|4|Register value|N*2 bytes|Every two bytes represent a register value, with high bit in front, low bit in back. The smallest register address comes first

1949

|5|CRC check|2 bytes|High bit in front, low bit in back

1950

1951

Error response: See error response frame.

1952

1953

**{{id name="_Toc216324734"/}}3)** {{id name="_Toc267753989"/}}{{id name="_Toc33979621"/}}**instruction code 0x05 (05): write single coil**

1954

1955

Request frame format: slave address + 0x05 + coil address + coil status + CRC check.

1956

1957

(% class="table-bordered" %)

1958

|**Serial number**|**Data (byte) meaning**|**Number of bytes**|**Instruction**

1959

|1|Slave address|1 byte|Value 1 to 247, set by SD2544, SD2594

1960

|2|0x05 (instruction code)|1 byte|Write single coil

1961

|3|Coil address|2 bytes|High bit in front, low bit in back, see coil addressing

1962

|4|Coil state|2 bytes|High bit in front, low bit in back. Non-zero is valid

1963

|5|CRC check|2 bytes|High bit in front, low bit in back

1964

1965

Response frame format: slave address + 0x05 + coil address + coil status + CRC check.

1966

1967

(% class="table-bordered" %)

1968

|**Serial number**|**Data (byte) meaning**|**Number of bytes**|**Instruction**

1969

|1|Slave address|1 byte|Value 1 to 247, set by SD2544, SD2594

1970

|2|0x05 (instruction code)|1 byte|Write single coil

1971

|3|Coil address|2 bytes|High bit in front, low bit in back, see coil addressing

1972

|4|Coil state|2 bytes|High bit in front, low bit in back. Non-zero is valid

1973

|5|CRC check|2 bytes|High bit in front, low bit in back

1974

1975

{{id name="_Toc33979622"/}}{{id name="_Toc267753990"/}}{{id name="_Toc216324735"/}}Error response: see error response frame. The coil status 0xFF00 means ON, and 0x0000 means OFF.

1976

1977

**4) instruction code 0x06 (06): write a single register**

1978

1979

Request frame format: slave address + 0x06 + register address + register value + CRC check.

1980

1981

(% class="table-bordered" %)

1982

|**Serial number**|**Data (byte) meaning**|**Number of bytes**|**Instruction**

1983

|1|Slave address|1 byte|Value 1 to 247, set by SD2544, SD2594

1984

|2|0x06 (instruction code)|1 byte|Write single coil

1985

|3|Register|2 bytes|High bit in front, low bit in back, see coil addressing

1986

|4|Register value|2 bytes|High bit in front, low bit in back. Non-zero is valid

1987

|5|CRC check|2 bytes|High bit in front, low bit in back

1988

1989

Response frame format: slave address + 0x06 + register address + register value + CRC check.

1990

1991

(% class="table-bordered" %)

1992

|**Serial number**|**Data (byte) meaning**|**Number of bytes**|**Instruction**

1993

|1|Slave address|1 byte|Value 1 to 247, set by SD2544, SD2594

1994

|2|0x06 (instruction code)|1 byte|Write single coil

1995

|3|Register|2 bytes|High bit in front, low bit in back, see coil addressing

1996

|4|Register value|2 bytes|High bit in front, low bit in back. Non-zero is valid

1997

|5|CRC check|2 bytes|High bit in front, low bit in back

1998

1999

Error response: See error response frame.{{id name="_Toc33979623"/}}{{id name="_Toc216324736"/}}{{id name="_Toc267753991"/}}

2000

2001

**5) instruction code 0x 0f (15): write multiple coils**

2002

2003

Request frame format: slave address + 0x 0f + coil start address + coil number + byte number + coil status + CRC check.

2004

2005

(% class="table-bordered" %)

2006

|**Serial number**|**Data (byte) meaning**|**Number of bytes**|**Instruction**

2007

|1|Slave address|1 byte|Value 1 to 247, set by SD2544, SD2594

2008

|2|0x 0f (instruction code)|1 byte|Write multiple single coils

2009

|3|Coil start address|2 bytes|High bit in front, low bit in back, see coil addressing

2010

|4|Number of coils|2 bytes|High bit in front, low bit in back. The maximum of N is 1968

2011

|5|Number of bytes|1 byte|Value: [(N+7)/8]

2012

|6|Coil state|[(N+7)/8] bytes|Every 8 coils are combined into one byte. If the last one is less than 8 bits, fill in 0 in the undefined part. The first 8 coils are in the first byte, and the coil with the smallest address is in the lowest bit. And so on

2013

|7|CRC check|2 bytes|High bit in front, low bit in back

2014

2015

Response frame format: slave address + 0x 0f + coil start address + coil number + CRC check

2016

2017

(% class="table-bordered" %)

2018

|**Serial number**|**Data (byte) meaning**|**Number of bytes**|**Instruction**

2019

|1|Slave address|1 byte|Value 1 to 247, set by SD2544, SD2594

2020

|2|0x 0f (instruction code)|1 byte|Write multiple single coils

2021

|3|Coil start address|2 bytes|High bit in front, low bit in back, see coil addressing

2022

|4|Number of coils|2 bytes|High bit in front, low bit in back

2023

|5|CRC check|2 bytes|High bit in front, low bit in back

2024

2025

Error response: See error response frame.

2026

2027

**{{id name="_Toc33979624"/}}6)** {{id name="_Toc216324737"/}}{{id name="_Toc267753992"/}}**3.2.6 instruction code 0x10 (16): write multiple registers**

2028

2029

Request frame format: slave address + 0x10 + register start address + register number + byte number + register value + CRC check.

2030

2031

(% class="table-bordered" %)

2032

|**Serial number**|**Data (byte) meaning**|**Number of bytes**|**Instruction**

2033

|1|Slave address|1 byte|Value 1 to 247, set by SD2544, SD2594

2034

|2|0x10(instruction code)|1 byte|Write multiple registers

2035

|3|Register start address|2 bytes|High bit in front, low bit in back, see register addressing

2036

|4|Number of registers|2 bytes|High bit in front, low bit in back. The maximum of N is 120

2037

|5|Number of bytes|1 byte|Value: N*2

2038

|6|Register value|N*2 (N*4)|

2039

|7|CRC check|2 bytes|High bit in front, low bit in back

2040

2041

Response frame format: slave address + 0x10 + register start address + register number + CRC check.

2042

2043

(% class="table-bordered" %)

2044

|**Serial number**|**Data (byte) meaning**|**Number of bytes**|**Instruction**

2045

|1|Slave address|1 byte|Value 1 to 247, set by SD2544, SD2594

2046

|2|0x10 (instruction code)|1 byte|Write multiple registers

2047

|3|Register start address|2 bytes|High bit in front, low bit in back, see register addressing

2048

|4|Number of registers|2 bytes|High bit in front, low bit in back. The maximum of N is 120

2049

|5|CRC check|2 bytes|High bit in front, low bit in back

2050

2051

Error response: See error response frame.{{id name="_Toc33979625"/}}{{id name="_Toc216324738"/}}{{id name="_Toc267753993"/}}

2052

2053

**7) Error response frame**

2054

2055

Error response: slave address + (instruction code + 0x80) + Error code + CRC check.

2056

2057

(% class="table-bordered" %)

2058

|**Serial number**|**Data (byte) meaning**|**Number of bytes**|**Instruction**

2059

|1|Slave address|1 byte|Value 1 to 247, set by SD2544, SD2594

2060

|2|Instruction code+0x80|1 byte|Error instruction code

2061

|3|Code|1 byte|1 to 4

2062

|4|CRC check|2 bytes|High bit in front, low bit in back

2063

2064

(% class="table-bordered" %)

2065

|**Serial number**|**Error code**|**Instruction**

2066

|1|01|Unsupported function code

2067

|2|02|Wrong address or function code

2068

|3|03|Wrong length

2069

|4|04|Imperfect instruction

2070

|5|05|Address not allowed

2071

2072

**{{id name="_Toc33979626"/}}8) Slave address table**

2073

2074

(% class="table-bordered" %)

2075

|(% colspan="5" %)**Word address**

(% class="table-bordered" %)

2086

|(% colspan="5" %)**Bit address**

2087

2088

|T0 to T511|512 bit|0x0000-0x01ff| |1536

2089

|C0 to C255|256 bit|0x0600-0x06ff|1536|1024

2090

|LC0 to LC255|256 bit|0x0A00-0x0AFF|2560|1024

2091

|HSC0 to HSC15|16 bit|0x0E00-0x0E0F|3584|512

2092

|M0 to M7999|8000 bit|0x1000-0x2F3F|4096|16384

2093

|SM0 to SM4095|4096 bit|0x5000-0x5FFF|20480|12288

2094

2095

|S0 to S4095|4096 bit|0xC000-0xCFFF|49152|8192

2096

|X0 to X1777|1024 bit|0xE000-0xE3FF|57344|4096

2097

|Y0 to Y1777|1024 bit|0xF000-0xF3FF|61440|4096

**Error message**

Currently the Error code will be displayed on SD7 and SD0 and SD2611 and SD2612.

2102

2103

The Error codes that appear in the Modbus protocol are mainly as follows.

2104

2105

(% class="table-bordered" %)

2106

|(% style="width:101px" %)**Error code**|(% style="width:980px" %)**Content**

2107

|(% style="width:101px" %)4085H|(% style="width:980px" %)(s)(m)(d)(N) The read address is out of the device range (this error is only displayed on SD7 and SD0)

2108

|(% style="width:101px" %)3180H|(% style="width:980px" %)COM2 data reception error. There may be interference on the communication line, it is recommended to connect the ground wire.

2109

|(% style="width:101px" %)3181H|(% style="width:980px" %)COM2 data reception timed out. "Check the wiring, check whether the serial port parameter settings are compatible with master and slave, check whether there is interference. Check whether the slave station is too late to respond. For this reason, you can try to increase the sending interval SD2546."

2110

|(% style="width:101px" %)3182H|(% style="width:980px" %)COM2 CRC check error. There may be interference on the communication line, it is recommended to connect the ground wire.

2111

|(% style="width:101px" %)3183H|(% style="width:980px" %)COM2 LRC check error. There may be interference on the communication line, it is recommended to connect the ground wire.

2112

|(% style="width:101px" %)3184H|(% style="width:980px" %)The COM2 station number is incorrectly configured. Check the slave station number setting. And check whether there is any problem with the receiving and sending mechanism from the station.

2113

|(% style="width:101px" %)3185H|(% style="width:980px" %)COM2 send buffer overflow. Contact a technician if this error occurs

2114

|(% style="width:101px" %)3186H|(% style="width:980px" %)COM2 function code is wrong. Check whether the set function code is a function code supported by PLC

2115

|(% style="width:101px" %)3187H|(% style="width:980px" %)COM2 address is wrong. Check whether the slave station has this address (please refer to Modbus Abnormal 02)

2116

|(% style="width:101px" %)3188H|(% style="width:980px" %)The length of COM2 is wrong. Check whether the communication length exceeds the length range specified by the Modbus protocol, or whether it exceeds the specified length range of the custom protocol.

2117

|(% style="width:101px" %)3189H|(% style="width:980px" %)COM2 data error. "Check whether there are errors in the parameters of the instruction. Check whether the slave station supports the setting of this value. (Please refer to Modbus Abnormal 03)"

2118

|(% style="width:101px" %)318AH|(% style="width:980px" %)COM2 slave is busy. Slave station returns information: Slave station is busy (please refer to Modbus exception 06)

2119

|(% style="width:101px" %)318BH|(% style="width:980px" %)The COM2 slave station does not support function codes. Check whether the slave station supports this function code (please refer to Modbus exception 01)

2120

|(% style="width:101px" %)318CH|(% style="width:980px" %)The COM2 slave is faulty. Slave station returns information: Slave station is faulty, please check whether the slave station is faulty (please refer to Modbus Abnormal 04)

2121

|(% style="width:101px" %)318DH|(% style="width:980px" %)COM2 slave confirms. Slave station return information: slave station confirmation (please refer to Modbus abnormal 05)

2122

|(% style="width:101px" %)318EH|(% style="width:980px" %)COM2 current protocol does not support this instruction. RS instruction cannot be used when it is set to slave station protocol, please change the protocol or close the contact before RS instruction (this error is only displayed on SD7 and SD0)

2123

|(% style="width:101px" %)318FH|(% style="width:980px" %)COM2 sending timed out. Contact a technician if this error occurs

2124

|(% style="width:101px" %)3190H|(% style="width:980px" %)COM2 receiving data exceeds the buffer limit.

2125

|(% style="width:101px" %)31A0H|(% style="width:980px" %)COM2 is not available as a gateway. Returned information from the station: unavailable gateway (please refer to Modbus exception 0A)

2126

|(% style="width:101px" %)31A1H|(% style="width:980px" %)COM2 indicates that no response was obtained from the target device. Slave station returns information: the device is not in the network (please refer to Modbus exception 0B)

2127

2128

After resetting the protocol or communication parameters, the error will be cleared.

2129

2130

In addition, the communication completion/communication error/communication timeout flag will be set after the executed instruction.

2131

2132

== {{id name="_10.7 WECON MODBUS protocol description"/}}**PLCLINK/Fast interconnect** ==

2133

2134

PLCLINK function is used to simplify the fast connection between PLCs. The fast communication of the LX5V series PLC could be achieved only using the configuration parameters without using the communication instruction(RS).

2135

2136

The topological diagram is shown in the figure below.

2137

2138

(% style="text-align:center" %)

2139

[[image:image-20220614170612-1.jpeg]]

2140

2141

When using the PLCLINK function:

2142

2143

* Master station configuration: Select COM2 port and set the protocol to PLCLINK protocol.

2144

* Slave configuration: Select COM1 or COM2 and set the protocol to dedicated protocol.

2145

2146

(% class="wikigeneratedid" id="H28129Createatable" %)

2147

**(1) Create a table**

2148

2149

In [Project manager]-[Extended function]-[PLCLINK], right click [PLCLINK], and click it to create a table.

2150

2151

(% style="text-align:center" %)

2152

[[image:10_html_347d7923523ad9af.png||class="img-thumbnail"]]

2153

2154

Click it and a prompt box as below would pop up.

2155

2156

(% style="text-align:center" %)

2157

[[image:10_html_dbbb9b1ddaa56dce.png||class="img-thumbnail"]]

2158

2159

Click "Yes" will automatically change the protocol to PLCLINK, click "No" will not change the protocol.

2160

2161

The number of PLCLINK protocol is H60.

2162

2163

(% class="table-bordered" %)

2164

|**0H**|Wecon Modbus slave station

2165

|**2H**|ModbusRTU slave station

2166

|**3H**|ModbusASCII slave station

2167

|**10H**|user-defined protocol

2168

|**20H**|ModbusRTU main station

2169

|**30H**|ModbusASCII main station

2170

|**60H**|PLCLINK protocol

2171

2172

Click "Yes" will generate an empty table MAIN.

2173

2174

(% style="text-align:center" %)

2175

[[image:10_html_39ce9cf6a41c3901.png||class="img-thumbnail"]]

2176

2177

Double click MAIN will pop up the POLCLINK table as below.

2178

2179

(% style="text-align:center" %)

2180

[[image:10_html_14072bc2a32c267.png||class="img-thumbnail"]]

2181

2182

Currently only one PLCLINK table can be created. Creating a new table after creating one is disallowed.

2183

2184

(% style="text-align:center" %)

2185

[[image:10_html_f4bec5285beb7949.png||class="img-thumbnail"]]

(2) Write the table

Write station number in

2190

2191

After writing the station number in the new instruction station number in the table, click the new instruction to add the communication instruction.

2192

2193

The range of station number is 1 to 31. The maximum number of communication instruction is 255.

2194

2195

(% style="text-align:center" %)

2196

[[image:10_html_21d3b9789058efb3.png||class="img-thumbnail"]]

2197

2198

(% style="text-align:center" %)

2199

[[image:10_html_20232344eaa6cb2a.png||class="img-thumbnail"]]

2200

2201

Currently the station number is only selected by drop-down box.

2202

2203

(% style="text-align:center" %)

2204

[[image:10_html_f09857f93ae04f0a.png||class="img-thumbnail"]]

2205

2206

The devices of main station and slave station are selected by drop-down box.

2207

2208

(% style="text-align:center" %)

2209

[[image:10_html_99c7d435825defd1.png||class="img-thumbnail"]]

2210

2211

(% style="text-align:center" %)

2212

[[image:10_html_f62cce6501331b8d.png||class="img-thumbnail"]]

2213

2214

The transfer direction are read and write, and also selected by drop-down box.

2215

2216

(% style="text-align:center" %)

2217

[[image:10_html_7b3de12a134b4e95.png||class="img-thumbnail"]]

2218

2219

The device address range limitations are as below.

2220

2221

1. The device address could not exceed the current device range

2222

1. {{id name="OLE_LINK102"/}}In the device of bit written, the mantissa of points of X and Y must be zero, such as X0, X10, X20, Y0, Y10, Y20 and so on. The software PLC Editor 2 will adjust automatically.

2223

1. {{id name="OLE_LINK106"/}}The Points of bit device other than X and Y must be a multiple of 8,such as M0, M8, N16, T(bit) 16, C(bit) 24 and so on. The software PLC Editor 2 will adjust automatically.

2224

1. {{id name="OLE_LINK103"/}}Bit device must communicate with bit device , and word device must communicate with word device. Double word device can only communicate with double word device. This is to avoid length perception differences.

2225

2226

{{id name="OLE_LINK104"/}}The number limitations of slave station device are as below.

2227

2228

1. The number of bit device ranges from 8 to 2,032.

2229

1. {{id name="OLE_LINK105"/}}The number of word device ranges from 1 to 126.

2230

1. The number of double word device ranges from 1 to 63. HSC can only use a maximum of 16 due to the number limitation.

2231

1. The number of bit device must be a multiple of 8, such as 8, 16, 24, 32 and so on. The software PLC Editor 2 will adjust automatically.display the corresponding device address and range.

(3) Download

{{id name="OLE_LINK107"/}}Currently PLCLINK could only be downloaded with the program and could not downloaded separately.

2236

2237

(% style="text-align:center" %)

2238

[[image:10_html_a586bd0ca75cd8f.png||class="img-thumbnail"]]

2239

2240

Click on PLCLINK in monitoring mode to re-write part of the table into PLC, but the start device could not be modified.

2241

2242

(% style="text-align:center" %)

2243

[[image:10_html_92ca328b83e6ef12.png||class="img-thumbnail"]]

2244

2245

In monitoring mode, monitoring read and monitoring write could not be executed if the ladder program comparison is incorrect.

(4) Automatic check

Click “Check” in monitoring mode, the PLC that can communicate will be automatically searched and enabled. Stations that could not communicate will be closed. The Stations without instructions will not be checked. The PLCLINK table will be updated after the automatic check of the upper computer is finished.

2250

2251

(% style="text-align:center" %)

2252

[[image:10_html_d6ff78427b75140d.png||class="img-thumbnail"]]

2253

2254

Write 1 to in the table for addresses whose start address is offset 12 (for example, R200 is R212). The corresponding function is as below.

2255

2256

(% class="table-bordered" %)

|**S1+12**|(((

Auto check mode

(Reserved)

)))|(((

{{id name="OLE_LINK109"/}}0: No check; 1: Automatic check mode; 2: Automatic check in progress.

2263

2264

{{id name="OLE_LINK110"/}}{{id name="OLE_LINK111"/}}When enabled, all the station numbers will send data to determine whether the station number exists. The corresponding communication switch will be turned on if it exists. If not, the corresponding communication switch will be turned off.

2265

)))

2266

2267

No error will be reported during auto check after the auto check is enabled. After the check is complete, the corresponding station number will be automatically enabled and disabled.

2268

2269

(% class="table-bordered" %)

2270

|**S1+13**|Corresponding station number communication switch 1|(((

2271

The switch control of station 1 to 15

2272

2273

{{id name="OLE_LINK112"/}}Bit0: ON: Station number 0 (broadcast) normal communication

2274

2275

OFF: Station number 0 (broadcast) communication prohibited (broadcast prohibited)

2276

2277

Bit1: ON: Station number 1 normal communication; OFF: Station 1 communication prohibited

2278

2279

Bit2: ON: Station number 2 normal communication; OFF: Station 2 communication prohibited

2280

)))

2281

|**S1+14**|Corresponding station number communication switch 2|The switch control of station 16 to 31

2282

2283

Click [station number enable] to set the station enable according to the corresponding situations.

2284

2285

(% style="text-align:center" %)

2286

[[image:10_html_beda0fdc84802959.png||class="img-thumbnail"]]

2287

2288

(% style="text-align:center" %)

2289

[[image:10_html_f84703130b23d8f6.png||class="img-thumbnail"]]

2290

2291

**✎Note: **When in the automatic check state, forcibly turn off the automatic check state (write 0 in S1+12), an error may occur.

2292

2293

{{id name="OLE_LINK113"/}}(5) Main station parameter configuration

2294

2295

(% style="text-align:center" %)

2296

[[image:10_html_434fac0fa8c16597.png||class="img-thumbnail"]]

2297

2298

The protocol must be PLCLINK protocol, and the data bit can not be 7-bit data bit. Other parameters can be selected as required.

2299

2300

(6) Slave station configuration

2301

2302

For PLCLINK communication ports, select the dedicated protocol from the station protocol.

2303

2304

(% style="text-align:center" %)

2305

[[image:10_html_2641eb7c39f4f4aa.png||class="img-thumbnail"]]

2306

2307

The settings of Baud rate, data bit, stop bit, parity bit must be consistent with main station. The parameters above are consistent if not modified. The station number needs to be configured separately. The slave station number ranges from 1 to 31.

2308

2309

{{id name="OLE_LINK115"/}}(7) Close PLCLINK

2310

2311

In S1+11, The pause and start of PLCLINK are controlled by bit 8. If bit 8 is ON, PLCLINK would be closed. No error is reported when switching protocol after this function is disabled.

2312

2313

(% class="table-bordered" %)

2314

|**S1+11**|Operation state|(((

2315

Bit0=1，Port is occupied. This function obtains the right of data transaction transmission.

2316

2317

Bit2=1，One cycle has been executed.

2318

2319

{{id name="OLE_LINK114"/}}Bit4，Communication transmission output indication

2320

2321

Bit5，Communication error output indication (Exceeds the number of retry times)

2322

2323

Bit6，Communication completion output indication

2324

2325

Bit8，PLCLINK suspension (0: Normal operation, 1: Operation paused)

)))

(8) Table contents

{{id name="OLE_LINK119"/}}Currently the communication table is downloaded to the device to operate. The details of the table are as follows.

2331

2332

(% class="table-bordered" %)

2333

|(% rowspan="2" %)**Address offset**|(% colspan="2" %){{id name="OLE_LINK116"/}}**Brief description**|(% rowspan="2" %)**Detailed description**

2334

|**High byte**|**Low byte**

2335

|S1+0|(% colspan="2" %)Header|{{id name="OLE_LINK117"/}}Header =70h, correct PLCLINK table. (modification prohibited)

2336

|S1+1|(% colspan="2" %)Number of communication instructions|1 to 255 (modification prohibited)

2337

|S1+2|(% colspan="2" %)Version|{{id name="OLE_LINK121"/}}{{id name="OLE_LINK118"/}}V1.100 (modification prohibited)

2338

|S1+3|(% colspan="2" %){{id name="OLE_LINK120"/}}The start address of communication table|modification prohibited

2339

|S1+4|(% colspan="2" %)Check bit of the number of header and communication|Simple check calculation for table header, number of communication instructions, version, and the start address of communication table ((modification prohibited))

2340

|S1+5|(% colspan="2" %)Which instruction currently is running|Display the current running command (read only)

2341

|S1+6|Station NO.1|Read/write direction|(% rowspan="5" %)The instruction content of current communication

2342

|S1+7|(% colspan="2" %)The data start address of station NO.1

2343

|S1+8|Station NO.2|Address type distinction

2344

|S1+9|(% colspan="2" %)The data start address of station NO.2

2345

|S1+10|(% colspan="2" %)Data length

2346

|S1+11|(% colspan="2" %)Operation state|(((

2347

Bit0=1,Port is occupied. This function obtains the right of data transaction transmission.

2348

2349

Bit2=1, One cycle has been executed.

2350

2351

Bit4, Communication transmission output indication

2352

2353

Bit5, Communication error output indication (Exceeds the number of retry times)

2354

2355

Bit6, Communication completion output indication

2356

2357

Bit8, PLCLINK suspension (0: Normal operation, 1: Operation paused)

2358

)))

2359

|S1+12|(% colspan="2" %)Auto check mode (Reserved)|(((

2360

0: No check; 1: Automatic check mode; 2: Automatic check in progress.

2361

2362

When enabled, all the station numbers will send data to determine whether the station number exists. The corresponding communication switch will be turned on if it exists. If not, the corresponding communication switch will be turned off.

2363

)))

2364

|S1+13|(% colspan="2" %)Corresponding station number communication switch 1|(((

2365

The switch control of station 1 to 15

2366

2367

Bit0: ON: Station NO. 0 (broadcast) normal communication

2368

2369

OFF: Station NO.0 (broadcast) communication prohibited (broadcast prohibited)

2370

2371

Bit1: ON: Station NO.1 normal communication;

2372

2373

OFF: Station NO.1 communication prohibited

2374

2375

Bit2: ON: Station NO.2 normal communication;

2376

2377

OFF: Station NO.2 communication prohibited

2378

)))

2379

|S1+14|(% colspan="2" %)Corresponding station number communication switch 2|The switch control of station 16 to 31

2380

|S1+15|(% colspan="2" %)Reserved|

2381

|S1+16|(% colspan="2" %)Reserved|

2382

|S1+17|(% colspan="2" %)Reserved|

2383

|S1+18|(% colspan="2" %)Reserved|

2384

|S1+19|(% colspan="2" %)Reserved|

2385

|S1+20|(% colspan="2" %)Reserved|

2386

|S1+21|Station NO.1|Read/write direction|(((

2387

• Station NO. 1 to 32, FF(FF represents main station)

• Function code:

~=01H, read

~=02H, write

)))

|S1+22|(% colspan="2" %)The data start address of station NO.1|• Valid word. Define operating the start address of slave station data

2396

|S1+23|Station NO.2|Address type distinction|(((

2397

•Station NO.0 to 32 (If it is 0, broadcast to all the slave stations on behalf of master station, and slave stations do not respond

2398

2399

•Distinguish the type of the starting device for storing data in the main station.

2400

2401

Main station address type distinction. 0: word address; 1: bit address

2402

)))

2403

|S1+24|(% colspan="2" %)The data start address of station NO.2|• Valid word. Define operating the start device of slave station data. Define the corresponding address by MUDBUS address of 5V.

2404

|S1+25|(% colspan="2" %)Data length|• Valid word. Range 1 to 126(bit data), 1 to 2,032(bit data)

2405

|S1+26|Station NO.1|Read/write direction|(% rowspan="5" %)(((

2406

The second data transmission description.

2407

2408

Main station address type distinction.

2409

)))

2410

|S1+27|(% colspan="2" %)The data start address of station NO.1

2411

|S1+28|Station NO.2|Address type distinction

2412

|S1+29|(% colspan="2" %)The data start address of station NO.2

2413

|S1+30|(% colspan="2" %)Data length

2414

|•|(% colspan="2" %) |　

2415

|•|(% colspan="2" %) |　

2416

|S1+20+ n×5|(% colspan="2" %)Reserved|• n is the total number of data transmission commands.

2417

2418

**{{id name="_Toc27709"/}}✎Note: **

2419

2420

1. It is forbidden to modify S0 to S4.

2421

1. It is not recommended to change the value except the function enable or station number enable. Otherwise, the operation or upload may be abnormal.

2422

2423

**{{id name="_Toc18822"/}}Error code**

2424

2425

(% class="table-bordered" %)

2426

|(% style="width:105px" %)**Error code**|(% style="width:976px" %)**Contents**

2427

|(% style="width:105px" %)31C0H|(% style="width:976px" %){{id name="OLE_LINK129"/}}Abnormal PLCLINK header. Re-download the program.

2428

|(% style="width:105px" %)31C1H|(% style="width:976px" %)PLCLINK function is not supported by COM port currently.

2429

|(% style="width:105px" %)31C2H|(% style="width:976px" %)PLCLINK table version is incompatible. Re-download the program.

2430

|(% style="width:105px" %)31C3H|(% style="width:976px" %)The number of PLCLINK command exceeds the range. The value ranges from 1 to 255 Currently.

2431

|(% style="width:105px" %)31C4H|(% style="width:976px" %){{id name="OLE_LINK133"/}}{{id name="OLE_LINK132"/}}The station number of PLCLINK table exceeds the range. Check the station number in the table.

2432

|(% style="width:105px" %)31C5H|(% style="width:976px" %)PLCLINK table exceeds the range of device. Check the corresponding device range of table.

2433

|(% style="width:105px" %)31C6H|(% style="width:976px" %)The device used by PLCLINK table command exceeds the range. Check the device used for each command in the table.

2434

|(% style="width:105px" %)3180H|(% style="width:976px" %)COM2 data reception error. There may be interference on the communication line. It is recommended to connect the ground wire.

2435

|(% style="width:105px" %)3181H|(% style="width:976px" %)COM2 data reception time. Check wiring, whether the parameters of the serial port setting is master-slave correspondence, whether there is interference, whether it is caused by the delay of the slave station. For this reason, try to increase the sending interval SD2546.

2436

|(% style="width:105px" %)3182H|(% style="width:976px" %)COM2 CRC check error. There may be interference on the communication line. It is recommended to connect the ground wire.

2437

|(% style="width:105px" %)3184H|(% style="width:976px" %)COM2 station number error. Check the setting of slave station number. Check whether there is a problem with the slave receiving and sending mechanism.

2438

|(% style="width:105px" %)3186H|(% style="width:976px" %){{id name="OLE_LINK135"/}}COM2 function code error. Check whether the function code is supported by PLC.

2439

|(% style="width:105px" %)3187H|(% style="width:976px" %)COM2 address error.

2440

|(% style="width:105px" %)3188H|(% style="width:976px" %){{id name="OLE_LINK136"/}}COM2 length error. Check whether the communication length exceeds the length range specified by Modbus or user-defined protocol.

2441

|(% style="width:105px" %)3189H|(% style="width:976px" %){{id name="OLE_LINK137"/}}{{id name="OLE_LINK138"/}}COM2 data error. Check whether the parameter of instruction is wrong. Check whether the setting of the value is supported by slave station. (Please refer to Modbus abnormal 03)

2442

|(% style="width:105px" %)318AH|(% style="width:976px" %){{id name="OLE_LINK139"/}}{{id name="OLE_LINK140"/}}COM2 slave station is busy. Slave station returns message: Slave station is busy. (Please refer to Modbus abnormal 06)

2443

|(% style="width:105px" %)318BH|(% style="width:976px" %){{id name="OLE_LINK141"/}}COM2 slave station does not support function codes. Check whether the function code is supported by slave station. (Please refer to Modbus abnormal 01)

2444

|(% style="width:105px" %)318CH|(% style="width:976px" %)COM2 slave station fault. Slave station returns message: Slave station is fault. Check whether the slave station is faulty. (Please refer to Modbus abnormal 04)

2445

|(% style="width:105px" %)318DH|(% style="width:976px" %)COM2 slave station confirmation. Slave station returns message: Slave station confirmation.(Please refer to Modbus abnormal 05)

2446

|(% style="width:105px" %)318EH|(% style="width:976px" %)COM2 does not support this instruction or function. When slave station protocol is set, the corresponding communication instruction or function of main station could not be used. Please change the protocol or close the contacts before the corresponding instruction, or the corresponding communication function.

2447

|(% style="width:105px" %)3190H|(% style="width:976px" %)The data received by COM2 exceeds the cache limit.

2448

2449

**{{id name="_Toc25970"/}}Example**

2450

2451

Create a PLCLINK table and automatically switch the Com2 protocol to PLCLINK.

2452

2453

(% style="text-align:center" %)

2454

[[image:10_html_c4962fb2076781b9.png||class="img-thumbnail"]]

2455

2456

{{id name="OLE_LINK143"/}}Open PLCLINK table, write the master station D10 to the slave station D10 device number 10, and read the slave station D10 to the master station D20 device number 10.

2457

2458

(% style="text-align:center" %)

2459

[[image:10_html_3244c013d7d800c3.png||class="img-thumbnail"]]

2460

2461

{{id name="OLE_LINK144"/}}Connect Com2 of master station PLC to COM1 of slave station, and set the slave station number to 1. After downloading, set the value of main station D10 to 1 and D11 to 8192 . Then, D20 will change to 1 and and D21 will change to 8192.

2462

2463

(% style="text-align:center" %)

2464

[[image:10_html_ae5ef70ce179ad5e.png||class="img-thumbnail"]]

2465

2466

**{{id name="_Toc27083"/}}The situation of connecting more than one**

2467

2468

When adding commands, the station number that corresponding more slave station number can add more station number communication connections

2469

2470

(% style="text-align:center" %)

2471

[[image:10_html_98f836562979721.png||class="img-thumbnail"]]

2472

2473

== {{id name="_Toc7760"/}}**Wecon Modbus protocol description** ==

2474

2475

The current Wecon Modbus protocol description (special protocol) is modified based on the ModbusRTU protocol.

2476

2477

Therefore, 7-bit data bits cannot be used in the serial port parameter part.

2478

2479

The protocol of COM0 and COM1 can only use WECON Modbus protocol at present and cannot be changed.

2480

2481

This protocol is fully compatible with Modbus RTU protocol, and the address is also the same as the default address of LX5V PLC's Modbus RTU protocol.

2482

2483

The extended function is mainly used to communicate with PLCEDITOR.

Wiki source code of 10 Communication