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

**✎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.

45

46

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" %)

51

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

52

|0 H|Wecon Modbus slave

53

|2 H|ModbusRTU slave

54

|3 H|ModbusASCII slave

55

|10 H|User-defined protocol

56

|20 H|ModbusRTU master station

57

|30 H|ModbusASCII master

58

59

**Related software components**

60

61

(% class="table-bordered" %)

62

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

63

|SD2542|COM1 protocol settings

64

|SD2543|COM1 protocol modification sign

65

|SD2592|COM2 protocol settings

66

|SD2593|COM2 protocol modification sign

**✎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.

71

72

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" %)

77

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

78

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

|4084H|(N) is not 1

**Example**

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

84

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

Example above

M1 changes from OFF to ON during the run

89

90

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.

91

92

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

93

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

94

95

If you turn M1 from OFF to ON again

96

97

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

98

99

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

100

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

101

102

= **Modbus serial port parameter setting** =

103

104

== {{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**

113

114

(% class="table-bordered" %)

115

116

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

117

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

**Device used**

(% class="table-bordered" %)

122

|(% 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**

132

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

133

|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.

138

139

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.

140

141

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

142

143

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.

144

145

**✎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.

146

147

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.

148

149

**Serial port parameter setting table**

150

151

(% class="table-bordered" %)

152

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

153

154

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

b2,b1

(0,0):None

(0,1):Odd parity(ODD)

160

161

(1,1):Even parity(EVEN)

162

)))|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

174

|**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

175

176

**Related software components**

177

178

(% class="table-bordered" %)

179

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

180

|SD2540|COM1 serial port parameter setting

181

|SD2541|COM1 serial port parameter modification identification

182

|SD2590|COM2 serial port parameter setting

183

|SD2591|COM2 serial port parameter modification sign

**✎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.

188

189

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

190

191

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" %)

196

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

197

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

198

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

**Example**

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203

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

Example above

M1 changes from OFF->ON during run

208

209

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

210

211

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

212

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

213

214

If you turn M1 from OFF->ON again

215

216

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

217

218

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

219

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

220

221

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

222

223

== {{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**

232

233

(% class="table-bordered" %)

234

235

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

236

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

**Device used**

(% class="table-bordered" %)

241

|(% 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**

251

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

252

|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.

257

258

●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.

259

260

●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

261

262

●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.

263

264

**✎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.

265

266

●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.

267

268

**Related software components**

269

270

(% class="table-bordered" %)

271

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

272

|SD2544|COM1 station number setting

273

|SD2545|COM1 station number modification sign

274

|SD2594|COM2 station number setting

275

|SD2595|COM2 station number modification sign

**Error code**

(% class="table-bordered" %)

280

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

281

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

282

|(% 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" %)

292

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

Example above

M1 changes from OFF->ON during run

297

298

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

299

300

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

301

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

302

303

If you turn M1 from OFF->ON again

304

305

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

306

307

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

308

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

309

310

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

311

312

== {{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).

317

318

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

319

320

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

321

322

In the case of user-defined protocol:

323

324

(% class="table-bordered" %)

325

326

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

327

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

328

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

329

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

330

331

In the case of Modbus protocol:

332

333

(% 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

340

|(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

341

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

342

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

343

344

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

345

346

(% class="table-bordered" %)

**Pulse**

**extension**

)))

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

353

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

354

|Parameter 2|●|●|●|●|●|●| |

355

|Parameter 3|●|●|●|●|●|●| |

356

|Parameter 4|●|●|●|●|●|●| |

357

358

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

359

360

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.

361

362

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.

363

364

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:

365

366

(% class="table-bordered" %)

367

|(% 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)

383

384

(1,1): Even parity (EVEN)

385

)))|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" %)

405

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

406

407

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

408

409

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

410

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

411

412

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.,

413

414

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

415

416

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

417

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

418

419

(((

420

Serial port parameters settings:

421

422

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

)))

(((

Set the protocol as a custom protocol

427

428

Sending interval: 5ms

429

430

Receiving timeout: 100ms

431

432

Number of repetitions: 3 times

433

434

Timeout between characters: 30ms

435

436

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

437

438

Receive start address D300 Receive length 6

439

440

Send directly after trigger

441

442

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

443

)))

444

445

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

446

447

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

448

449

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.

450

451

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

452

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

453

454

(% class="table-bordered" %)

455

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

456

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

457

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

458

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

459

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

460

461

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

462

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

463

464

(((

465

Serial port parameter setting

466

467

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

468

469

Communication protocol setting: ModbusRTU master station protocol

470

471

Sending interval: 5ms

472

473

Receiving timeout: 100ms

474

475

Timeout retry times: 3 times

476

477

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

478

)))

479

480

As the ladder program shown above:

481

482

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

483

484

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

485

486

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

487

488

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

489

490

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

491

492

A5 C8: CRC check code.

493

494

For detailed custom protocol instructions, please refer to "[[(% class="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.

499

500

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

501

502

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

503

504

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

505

506

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

507

508

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

509

510

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

511

512

(% class="table-bordered" %)

513

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

514

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

515

|(% 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.

516

|(% 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."

517

|(% 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.

518

|(% 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.

519

|(% 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.

520

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

521

|(% 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

522

|(% 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)

523

|(% 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.

524

|(% 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)"

525

|(% 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)

526

|(% 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)

527

|(% 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)

528

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

529

|(% 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.

530

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

531

|(% 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)

532

|(% 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)

533

534

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

535

536

== **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.

541

542

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.

543

544

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

545

546

**Content, range and data type**

In custom protocol

(% class="table-bordered" %)

In Modbus protocol

(% class="table-bordered" %)

561

562

|=(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

563

|=(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

564

|=(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" %)

571

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

572

**Offset modification**

573

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

**Pulse extension**

)))

**Features**

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

586

587

**(1) Custom protocol**

588

589

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.

590

591

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.

592

593

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:

594

595

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

**B4、B5、B6、**

**B7、B8、B9**

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

601

602

|(% 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)

612

613

(1,1): even parity (EVEN)

614

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

615

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

616

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

617

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

618

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

619

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

620

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

621

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

622

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

623

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

624

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

625

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

626

|(% 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" %)

635

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

636

637

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

638

639

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

640

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

641

642

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.,

643

644

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

645

646

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

647

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

648

649

(((

650

Set the protocol to a custom protocol.

651

652

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

653

)))

654

655

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

656

657

**(2) Modbus protocol**

658

659

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.

660

661

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

662

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

663

664

(% class="table-bordered" %)

665

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

666

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

667

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

668

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

669

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

670

|=(n1)|Specify the communicatiom port

671

672

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

673

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

674

675

(((

676

As the ladder program shown above:

677

678

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

679

680

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

681

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

682

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

683

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

684

* A5 C8: CRC check code.

685

)))

686

687

For detailed custom protocol instructions, please refer to "[[(% class="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.

692

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

693

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

694

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

695

* 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.

696

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

**Error code**

(% class="table-bordered" %)

701

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

702

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

703

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

704

|=(% 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.

705

|=(% 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".

706

|=(% 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.

707

|=(% 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.

708

|=(% 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.

709

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

710

|=(% 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

711

|=(% 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)

712

|=(% 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.

713

|=(% 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)"

714

|=(% 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)

715

|=(% 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)

716

|=(% 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)

717

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

718

|=(% 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.

719

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

720

|=(% 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)

721

|=(% 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)

722

|=(% 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".

723

|=(% 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.

724

|=(% 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.

725

|=(% 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.

726

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

727

|=(% 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.

728

|=(% 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)

729

|=(% 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.

730

|=(% 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)"

731

|=(% 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)

732

|=(% 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)

733

|=(% 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)

734

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

735

|=(% 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.

736

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

737

|=(% 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)

738

|=(% 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)

739

740

= **Expansion module communication** =

741

742

== {{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).

747

748

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

749

750

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

751

752

(% class="table-bordered" %)

753

754

|(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" %)

762

|(% 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**

772

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

773

|Parameter 2|●|●|●|●|●|●|●|●|●|●|●|●

774

|Parameter 3|●|●|●|●|●|●|●|●|●|●|●|●

775

|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).

780

781

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

782

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

783

784

As the following Circuit program

785

786

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

787

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

788

789

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.

790

791

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

792

793

The special devices used are as follows

794

795

(% class="table-bordered" %)

796

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

797

|SD2081|Total number of modules

798

|SD2082|Number of IO expansion modules

799

|SD2083|Number of special expansion modules

800

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

**Error code**

(% class="table-bordered" %)

805

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

806

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

807

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

808

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

809

|7081H|Expansion module communication message is abnormal

810

|7082H|FROM/TO instruction error

811

|7083H|The specified extension module was not found

**Example**

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

816

[[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)

821

822

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

823

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

824

825

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

826

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

827

828

== **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).

833

834

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

835

836

**Content, range and data type**

837

838

(% class="table-bordered" %)

**Device used**

(% class="table-bordered" %)

848

|(% 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**

858

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

859

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

860

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

861

|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).

866

867

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

868

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

869

870

As the following Circuit program

871

872

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

873

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

874

875

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.

876

877

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

878

879

The special devices used are as follows

880

881

(% class="table-bordered" %)

882

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

883

|SD2081|Total number of modules

884

|SD2082|Number of IO expansion modules

885

|SD2083|Number of special expansion modules

886

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

**Error code**

(% class="table-bordered" %)

891

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

892

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

893

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

894

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

895

|7081H|Expansion module communication message is abnormal

896

|7082H|FROM/TO instruction error

897

|7083H|The specified extension module was not found

**Example**

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

902

[[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)

907

908

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

909

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

910

911

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

912

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

913

914

== {{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)]

923

924

**Content, range and data type**

925

926

(% class="table-bordered" %)

927

928

|(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" %)

936

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

937

**Offset modification**

938

)))|=(% 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.

950

951

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

952

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

953

954

As the following Circuit program

955

956

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

957

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

958

959

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.

960

961

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

962

963

The special soft components used are as follows:

964

965

(% class="table-bordered" %)

966

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

967

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

968

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

969

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

970

|=(% 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" %)

975

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

976

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

977

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

978

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

979

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

980

|=7081H|Expansion module communication message is abnormal

981

|=7082H|FROM/TO instruction error

982

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

**Example**

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

987

[[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

992

993

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

994

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

995

996

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

997

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

998

999

== {{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.

1004

1005

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

1006

1007

**Content, range and data type**

1008

1009

(% class="table-bordered" %)

1010

1011

|=(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" %)

1019

|=(% 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**

1029

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

1030

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

1031

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

1032

|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.

1037

1038

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

1039

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

1040

1041

As the following Circuit program

1042

1043

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

1044

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

1045

1046

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.

1047

1048

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

1049

1050

The special soft components used are as follows:

1051

1052

(% class="table-bordered" %)

1053

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

1054

|=SD2081|Total number of modules

1055

|=SD2082|Number of IO expansion modules

1056

|=SD2083|Number of special expansion modules

1057

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

**Error code**

(% class="table-bordered" %)

1062

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

1063

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

1064

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

1065

|=(% 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

1066

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

1067

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

1068

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

1069

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

**Example**

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

1074

[[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

1079

1080

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

1081

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

1082

1083

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

1084

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

1085

1086

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

1087

1088

== {{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** ==

1089

1090

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

1091

1092

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.

1093

1094

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.

1095

1096

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

1097

1098

**{{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.

1103

1104

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

1105

1106

**Content, range and data type**

1107

1108

(% class="table-bordered" %)

1109

1110

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

1111

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

1112

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

1113

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

1114

1115

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

1116

1117

(% class="table-bordered" %)

**Pulse**

**extension**

)))

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

1124

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

1125

|Parameter 2|●|●|●|●|●|●| |

1126

|Parameter 3|●|●|●|●|●|●| |

1127

|Parameter 4|●|●|●|●|●|●| |

1128

1129

**✎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.

1130

1131

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

1132

1133

Special address table

1134

1135

(% class="table-bordered" %)

1136

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

1137

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

1138

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

1139

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

1140

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

1141

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

1142

|2595|Station number modification logo|2595|

1143

|2596|(((

1144

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

1145

1146

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

1147

)))|2596|

1148

|2597|(((

1149

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

1150

1151

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

1152

)))|2597|

1153

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

1154

|2599|(((

1155

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

1156

1157

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

1158

)))|2599|

1159

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

1160

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

1161

|...| |...|

1162

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

1163

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

1164

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

1165

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

1166

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

1167

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

1168

1169

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

1170

1171

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

1172

1173

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

1174

1175

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

1176

1177

(% class="table-bordered" %)

1178

|(% 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)

1190

1191

(1,1): Even parity (EVEN)

1192

)))|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

1205

1206

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.

1207

1208

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.

1209

1210

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

1211

1212

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

1213

1214

(% class="table-bordered" %)

1215

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

1216

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

1217

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

1218

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

1219

1220

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

1221

1222

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

1223

1224

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

1225

1226

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

1227

1228

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.

1229

1230

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

1231

1232

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

1233

1234

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

1235

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

1236

1237

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.

1238

1239

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

1240

1241

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.

1242

1243

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

1244

1245

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

1246

1247

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

1248

1249

Currently this setting is only available for custom protocols.

1250

1251

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.

1252

1253

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

1254

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

1255

1256

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

1257

1258

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

1259

1260

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

1261

1262

**1) Host computer interface settings**

1263

1264

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

1265

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

1266

1267

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

1268

1269

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

1270

1271

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.

1272

1273

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

1274

1275

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

-[PORTPARA (s) (N)]

**Content, range and data type**

1280

1281

(% class="table-bordered" %)

**Data type**

**(label)**

)))

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

1288

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

1289

1290

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

1291

1292

(% class="table-bordered" %)

**Pulse**

**extension**

)))

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

1299

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

1300

|Parameter 2|●|●|●|●|●|●|●|●|●|●|●|●

1301

1302

Function: To set communication parameters when running.

1303

1304

Please refer to "PORTPARA instruction description" for details.

1305

1306

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

-[PROTOCOL (s) (N)]

**Content, range and data type**

1311

1312

(% class="table-bordered" %)

1313

1314

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

1315

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

1316

1317

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

1318

1319

(% class="table-bordered" %)

1320

|(% 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**

1330

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

1331

|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

1336

1337

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.

1338

1339

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

1340

1341

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

1342

1343

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.

1344

1345

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

1346

1347

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

1348

1349

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.

1350

1351

**(4) Ladder program**

1352

1353

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

1354

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

1355

1356

(((

1357

* Set serial port parameters:

1358

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

1359

* Set protocol to custom protocol

1360

* Sending interval: 5ms

1361

* Receiving timeout: 100ms

1362

* Number of repetitions: 3 times

1363

* Characters interval timeout: 30ms

1364

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

1365

* Receiving start address D300, receiving length 6

1366

* Send directly after trigger

1367

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

1368

)))

1369

1370

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

1371

1372

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

1373

1374

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

1375

1376

①16-bit (SM2594 is OFF)

1377

1378

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.

1379

1380

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

1381

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

1382

1383

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

1384

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

1385

1386

②8-bit (SM2594 is ON)

1387

1388

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

1389

1390

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

1391

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

1392

1393

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

1394

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

1395

1396

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

1397

1398

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

1399

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

1400

1401

Receiving will also be stored in the lower address

1402

1403

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

1404

1405

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

1406

1407

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

1408

1409

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

1410

1411

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.

1412

1413

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

1414

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

1415

1416

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

1417

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

1418

1419

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

1420

1421

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.

1422

1423

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

1424

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

1425

1426

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

1427

1428

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

1429

1430

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

1431

1432

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

1433

1434

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

1435

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

1436

1437

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

1438

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

1439

1440

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

1441

1442

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.

1443

1444

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

1445

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

1446

1447

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

1448

1449

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.

1450

1451

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

1452

1453

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

1454

1455

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

1456

1457

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.

1458

1459

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.

1460

1461

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].)

1462

1463

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.

1464

1465

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.

1470

1471

**✎**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.

1472

1473

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

1474

1475

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.

1476

1477

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

1478

1479

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.

1480

1481

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

1482

1483

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.

1484

1485

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

1486

1487

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

1488

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

1489

1490

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.

1491

1492

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

1493

1494

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

1495

1496

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.

1497

1498

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

1499

1500

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.

1501

1502

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

1503

1504

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

1505

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

1506

1507

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

1508

1509

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

1510

1511

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.

1512

1513

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.

1514

1515

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

1516

1517

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.

1518

1519

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.

1520

1521

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

1522

1523

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

1524

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

1525

1526

(((

1527

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.

1528

1529

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.

1530

)))

1531

1532

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

1533

1534

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

1535

1536

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

1537

1538

(% class="table-bordered" %)

1539

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

1540

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

1541

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

1542

|(% 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)"

1543

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

1544

Current protocol does not support this instruction

1545

1546

(This error is only displayed on SD7 and SD0)

1547

)))

1548

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

1549

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

1550

1551

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

1552

1553

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

1554

1555

**10.7.1.5 The difference with Mitsubishi**

1556

1557

The current differences:

1558

1559

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

1560

1. Add sum check and CR, LF.

1561

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.

1562

1563

== **Modbus protocol description** ==

**Introduction**

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

1568

1569

**Basic configuration**

**(1) Introduction**

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

1574

1575

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

1576

1577

**Content, range and data type**

1578

1579

(% class="table-bordered" %)

1580

1581

|(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

1582

|(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

1583

|(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

1584

1585

1586

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

1587

1588

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

**Pulse**

**extension**

)))

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

1595

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

1596

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

1597

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

1598

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

1599

1600

**✎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.

1601

1602

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

1603

1604

Special address table

1605

1606

(% class="table-bordered" %)

1607

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

1608

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

1609

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

1610

|2542|

1611

|2543|

1612

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

1613

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

1614

1615

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

1616

1617

(% class="table-bordered" %)

1618

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

1619

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

1620

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

1621

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

1622

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

1623

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

1624

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

1625

|2596|(((

1626

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

1627

1628

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

1629

)))|2596|

1630

|2597|(((

1631

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

1632

1633

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

1634

)))|2597|

1635

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

1636

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

1637

|2600|STX value|2600|

1638

|2601|ETX value|2601|

1639

|...| |...|

1640

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

1641

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

1642

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

1643

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

1644

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

1645

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

1646

1647

{{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.

1648

1649

**1) Communication port setting SD2590**

1650

1651

(% class="table-bordered" %)

1652

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

1653

1654

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

b2,b1

(0,0): None

(0,1): Odd parity (ODD)

1660

1661

(1,1): Even parity (EVEN)

1662

)))|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

1675

1676

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.

1677

1678

{{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.

1679

1680

**2) Protocol setting SD2592**

1681

1682

(% class="table-bordered" %)

1683

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

1684

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

1685

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

1686

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

1687

1688

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.

1689

1690

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

1691

1692

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.

1693

1694

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

1695

1696

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

1697

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

1698

1699

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.

1700

1701

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

1702

1703

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.

1704

1705

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

1706

1707

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

1708

1709

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

1710

**Serial port parameter setting**

1711

1712

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

1713

**PORTPARA instruction**

-[PORTPARA (s) (N)]

**Content, range and data type**

1718

1719

(% class="table-bordered" %)

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

1725

1726

(% class="table-bordered" %)

1727

|(% 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**

1737

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

1738

|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**.**

1743

1744

**PROTOCOL instruction**

-[PROTOCOL (s) (N)]

**Content, range and data type**

1749

1750

(% class="table-bordered" %)

1751

1752

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

1753

|(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**

1764

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

1765

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

1766

1767

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

1768

1769

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

1770

1771

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

1772

1773

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. .

1774

1775

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

1776

1777

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

1778

1779

For details, please refer to "PROTOCOL instruction description"

1780

1781

**3) Host computer settings**

1782

1783

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

1784

1785

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

1786

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

1787

1788

Specialized protocol station number cannot be 0.

1789

1790

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

1791

1792

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

1793

1794

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

1795

1796

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

1797

1798

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

1799

1800

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

1801

1802

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.

1803

1804

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

1805

1806

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

1807

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

1808

1809

(((

1810

Serial port parameter setting

1811

1812

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

1813

1814

Communication protocol setting: ModbusRTU master station protocol

1815

1816

Sending interval: 5ms

1817

1818

Receiving timeout: 100ms

1819

1820

Timeout retry times: 3 times

1821

1822

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

)))

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

1828

1829

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

1830

1831

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.

1832

1833

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.

1834

1835

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.

1836

1837

Modbus master function list

1838

1839

(% class="table-bordered" %)

1840

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

1841

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

1842

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

1843

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

1844

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

1845

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

1846

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

1847

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

1848

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

1849

1850

(((

1851

Serial port parameter setting

1852

1853

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

Example:

)))

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

1859

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

1860

1861

(((

1862

Communication protocol setting: ModbusRTU master station protocol

1863

1864

Sending interval: 5ms

1865

1866

Receiving timeout: 100ms

1867

1868

Timeout retry times: 3 times

1869

1870

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

)))

As shown in the ladder program shown:

1876

1877

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

1878

1879

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

1880

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

1881

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

1882

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

1883

* 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.

1888

1889

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.

1890

1891

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

1892

1893

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.

1894

1895

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.

1896

1897

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

1898

1899

(% class="table-bordered" %)

1900

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

1901

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

1902

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

1903

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

1904

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

1905

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

1906

1907

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

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

1914

|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

1915

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

1916

1917

Error response: refer to error response frame.

1918

1919

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

1920

1921

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

1922

1923

(% class="table-bordered" %)

1924

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

1925

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

1926

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

1927

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

1928

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

1929

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

1930

1931

Response frame format: slave address + 0x03 + number of bytes + register value + 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|Number of bytes|1 byte|Value: N*2

1938

|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

1939

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

1940

1941

Error response: See error response frame.

1942

1943

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

1944

1945

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

1946

1947

(% class="table-bordered" %)

1948

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

1949

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

1950

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

1951

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

1952

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

1953

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

1954

1955

Response 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

{{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.

1966

1967

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

1968

1969

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

1970

1971

(% class="table-bordered" %)

1972

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

1973

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

1974

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

1975

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

1976

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

1977

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

1978

1979

Response 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

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

1990

1991

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

1992

1993

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

1994

1995

(% class="table-bordered" %)

1996

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

1997

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

1998

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

1999

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

2000

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

2001

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

2002

|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

2003

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

2004

2005

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

2006

2007

(% class="table-bordered" %)

2008

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

2009

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

2010

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

2011

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

2012

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

2013

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

2014

2015

Error response: See error response frame.

2016

2017

**{{id name="_Toc33979624"/}}6)** {{id name="_Toc216324737"/}}{{id name="_Toc267753992"/}}**3.2.6 instruction code 0x10 (16): write multiple registers**

2018

2019

Request frame format: slave address + 0x10 + register start address + register number + byte number + register value + CRC check.

2020

2021

(% class="table-bordered" %)

2022

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

2023

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

2024

|2|0x10(instruction code)|1 byte|Write multiple registers

2025

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

2026

|4|Number of registers|2 bytes|High bit in front, low bit in back. The maximum of N is 120

2027

|5|Number of bytes|1 byte|Value: N*2

2028

|6|Register value|N*2 (N*4)|

2029

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

2030

2031

Response frame format: slave address + 0x10 + register start address + register number + CRC check.

2032

2033

(% class="table-bordered" %)

2034

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

2035

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

2036

|2|0x10 (instruction code)|1 byte|Write multiple registers

2037

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

2038

|4|Number of registers|2 bytes|High bit in front, low bit in back. The maximum of N is 120

2039

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

2040

2041

Error response: See error response frame.{{id name="_Toc33979625"/}}{{id name="_Toc216324738"/}}{{id name="_Toc267753993"/}}

2042

2043

**7) Error response frame**

2044

2045

Error response: slave address + (instruction code + 0x80) + Error code + CRC check.

2046

2047

(% class="table-bordered" %)

2048

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

2049

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

2050

|2|Instruction code+0x80|1 byte|Error instruction code

2051

|3|Code|1 byte|1 to 4

2052

|4|CRC check|2 bytes|High bit in front, low bit in back

2053

2054

(% class="table-bordered" %)

2055

|**Serial number**|**Error code**|**Instruction**

2056

|1|01|Unsupported function code

2057

|2|02|Wrong address or function code

2058

|3|03|Wrong length

2059

|4|04|Imperfect instruction

2060

|5|05|Address not allowed

2061

2062

**{{id name="_Toc33979626"/}}8) Slave address table**

2063

2064

(% class="table-bordered" %)

2065

|(% colspan="5" %)**Word address**

(% class="table-bordered" %)

2076

|(% colspan="5" %)**Bit address**

2077

2078

|T0 to T511|512 bit|0x0000-0x01ff| |1536

2079

|C0 to C255|256 bit|0x0600-0x06ff|1536|1024

2080

|LC0 to LC255|256 bit|0x0A00-0x0AFF|2560|1024

2081

|HSC0 to HSC15|16 bit|0x0E00-0x0E0F|3584|512

2082

|M0 to M7999|8000 bit|0x1000-0x2F3F|4096|16384

2083

|SM0 to SM4095|4096 bit|0x5000-0x5FFF|20480|12288

2084

2085

|S0 to S4095|4096 bit|0xC000-0xCFFF|49152|8192

2086

|X0 to X1777|1024 bit|0xE000-0xE3FF|57344|4096

2087

|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.

2092

2093

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

2094

2095

(% class="table-bordered" %)

2096

|(% style="width:101px" %)**Error code**|(% style="width:980px" %)**Content**

2097

|(% 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)

2098

|(% 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.

2099

|(% 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."

2100

|(% 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.

2101

|(% 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.

2102

|(% 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.

2103

|(% style="width:101px" %)3185H|(% style="width:980px" %)COM2 send buffer overflow. Contact a technician if this error occurs

2104

|(% 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

2105

|(% 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)

2106

|(% 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.

2107

|(% 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)"

2108

|(% 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)

2109

|(% 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)

2110

|(% 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)

2111

|(% style="width:101px" %)318DH|(% style="width:980px" %)COM2 slave confirms. Slave station return information: slave station confirmation (please refer to Modbus abnormal 05)

2112

|(% 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)

2113

|(% style="width:101px" %)318FH|(% style="width:980px" %)COM2 sending timed out. Contact a technician if this error occurs

2114

|(% style="width:101px" %)3190H|(% style="width:980px" %)COM2 receiving data exceeds the buffer limit.

2115

|(% 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)

2116

|(% 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)

2117

2118

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

2119

2120

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

2121

2122

== {{id name="_10.7 WECON MODBUS protocol description"/}}**PLCLINK/Fast interconnect** ==

2123

2124

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).

2125

2126

The topological diagram is shown in the figure below.

2127

2128

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

2129

[[image:image-20220614170612-1.jpeg]]

2130

2131

When using the PLCLINK function:

2132

2133

* Master station configuration: Select COM2 port and set the protocol to PLCLINK protocol.

2134

* Slave configuration: Select COM1 or COM2 and set the protocol to dedicated protocol.

2135

2136

(% class="wikigeneratedid" id="H28129Createatable" %)

2137

**(1) Create a table**

2138

2139

In [Project manager]-[Extended function]-[PLCLINK], right click [PLCLINK], and click it to create a table.

2140

2141

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

2142

[[image:10_html_347d7923523ad9af.png||class="img-thumbnail"]]

2143

2144

Click it and a prompt box as below would pop up.

2145

2146

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

2147

[[image:10_html_dbbb9b1ddaa56dce.png||class="img-thumbnail"]]

2148

2149

Click "Yes" will automatically change the protocol to PLCLINK, click "No" will not change the protocol.

2150

2151

The number of PLCLINK protocol is H60.

2152

2153

(% class="table-bordered" %)

2154

|**0H**|Wecon Modbus slave station

2155

|**2H**|ModbusRTU slave station

2156

|**3H**|ModbusASCII slave station

2157

|**10H**|user-defined protocol

2158

|**20H**|ModbusRTU main station

2159

|**30H**|ModbusASCII main station

2160

|**60H**|PLCLINK protocol

2161

2162

Click "Yes" will generate an empty table MAIN.

2163

2164

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

2165

[[image:10_html_39ce9cf6a41c3901.png||class="img-thumbnail"]]

2166

2167

Double click MAIN will pop up the POLCLINK table as below.

2168

2169

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

2170

[[image:10_html_14072bc2a32c267.png||class="img-thumbnail"]]

2171

2172

Currently only one PLCLINK table can be created. Creating a new table after creating one is disallowed.

2173

2174

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

2175

[[image:10_html_f4bec5285beb7949.png||class="img-thumbnail"]]

(2) Write the table

Write station number in

2180

2181

After writing the station number in the new instruction station number in the table, click the new instruction to add the communication instruction.

2182

2183

The range of station number is 1 to 31. The maximum number of communication instruction is 255.

2184

2185

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

2186

[[image:10_html_21d3b9789058efb3.png||class="img-thumbnail"]]

2187

2188

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

2189

[[image:10_html_20232344eaa6cb2a.png||class="img-thumbnail"]]

2190

2191

Currently the station number is only selected by drop-down box.

2192

2193

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

2194

[[image:10_html_f09857f93ae04f0a.png||class="img-thumbnail"]]

2195

2196

The devices of main station and slave station are selected by drop-down box.

2197

2198

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

2199

[[image:10_html_99c7d435825defd1.png||class="img-thumbnail"]]

2200

2201

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

2202

[[image:10_html_f62cce6501331b8d.png||class="img-thumbnail"]]

2203

2204

The transfer direction are read and write, and also selected by drop-down box.

2205

2206

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

2207

[[image:10_html_7b3de12a134b4e95.png||class="img-thumbnail"]]

2208

2209

The device address range limitations are as below.

2210

2211

1. The device address could not exceed the current device range

2212

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.

2213

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.

2214

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.

2215

2216

{{id name="OLE_LINK104"/}}The number limitations of slave station device are as below.

2217

2218

1. The number of bit device ranges from 8 to 2,032.

2219

1. {{id name="OLE_LINK105"/}}The number of word device ranges from 1 to 126.

2220

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.

2221

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.

2226

2227

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

2228

[[image:10_html_a586bd0ca75cd8f.png||class="img-thumbnail"]]

2229

2230

Click on PLCLINK in monitoring mode to re-write part of the table into PLC, but the start device could not be modified.

2231

2232

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

2233

[[image:10_html_92ca328b83e6ef12.png||class="img-thumbnail"]]

2234

2235

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.

2240

2241

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

2242

[[image:10_html_d6ff78427b75140d.png||class="img-thumbnail"]]

2243

2244

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.

2245

2246

(% 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.

2253

2254

{{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.

2255

)))

2256

2257

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.

2258

2259

(% class="table-bordered" %)

2260

|**S1+13**|Corresponding station number communication switch 1|(((

2261

The switch control of station 1 to 15

2262

2263

{{id name="OLE_LINK112"/}}Bit0: ON: Station number 0 (broadcast) normal communication

2264

2265

OFF: Station number 0 (broadcast) communication prohibited (broadcast prohibited)

2266

2267

Bit1: ON: Station number 1 normal communication; OFF: Station 1 communication prohibited

2268

2269

Bit2: ON: Station number 2 normal communication; OFF: Station 2 communication prohibited

2270

)))

2271

|**S1+14**|Corresponding station number communication switch 2|The switch control of station 16 to 31

2272

2273

Click [station number enable] to set the station enable according to the corresponding situations.

2274

2275

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

2276

[[image:10_html_beda0fdc84802959.png||class="img-thumbnail"]]

2277

2278

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

2279

[[image:10_html_f84703130b23d8f6.png||class="img-thumbnail"]]

2280

2281

**✎Note: **When in the automatic check state, forcibly turn off the automatic check state (write 0 in S1+12), an error may occur.

2282

2283

{{id name="OLE_LINK113"/}}(5) Main station parameter configuration

2284

2285

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

2286

[[image:10_html_434fac0fa8c16597.png||class="img-thumbnail"]]

2287

2288

The protocol must be PLCLINK protocol, and the data bit can not be 7-bit data bit. Other parameters can be selected as required.

2289

2290

(6) Slave station configuration

2291

2292

For PLCLINK communication ports, select the dedicated protocol from the station protocol.

2293

2294

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

2295

[[image:10_html_2641eb7c39f4f4aa.png||class="img-thumbnail"]]

2296

2297

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.

2298

2299

{{id name="OLE_LINK115"/}}(7) Close PLCLINK

2300

2301

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.

2302

2303

(% class="table-bordered" %)

2304

|**S1+11**|Operation state|(((

2305

Bit0=1，Port is occupied. This function obtains the right of data transaction transmission.

2306

2307

Bit2=1，One cycle has been executed.

2308

2309

{{id name="OLE_LINK114"/}}Bit4，Communication transmission output indication

2310

2311

Bit5，Communication error output indication (Exceeds the number of retry times)

2312

2313

Bit6，Communication completion output indication

2314

2315

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.

2321

2322

(% class="table-bordered" %)

2323

|(% rowspan="2" %)**Address offset**|(% colspan="2" %){{id name="OLE_LINK116"/}}**Brief description**|(% rowspan="2" %)**Detailed description**

2324

|**High byte**|**Low byte**

2325

|S1+0|(% colspan="2" %)Header|{{id name="OLE_LINK117"/}}Header =70h, correct PLCLINK table. (modification prohibited)

2326

|S1+1|(% colspan="2" %)Number of communication instructions|1 to 255 (modification prohibited)

2327

|S1+2|(% colspan="2" %)Version|{{id name="OLE_LINK121"/}}{{id name="OLE_LINK118"/}}V1.100 (modification prohibited)

2328

|S1+3|(% colspan="2" %){{id name="OLE_LINK120"/}}The start address of communication table|modification prohibited

2329

|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))

2330

|S1+5|(% colspan="2" %)Which instruction currently is running|Display the current running command (read only)

2331

|S1+6|Station NO.1|Read/write direction|(% rowspan="5" %)The instruction content of current communication

2332

|S1+7|(% colspan="2" %)The data start address of station NO.1

2333

|S1+8|Station NO.2|Address type distinction

2334

|S1+9|(% colspan="2" %)The data start address of station NO.2

2335

|S1+10|(% colspan="2" %)Data length

2336

|S1+11|(% colspan="2" %)Operation state|(((

2337

Bit0=1,Port is occupied. This function obtains the right of data transaction transmission.

2338

2339

Bit2=1, One cycle has been executed.

2340

2341

Bit4, Communication transmission output indication

2342

2343

Bit5, Communication error output indication (Exceeds the number of retry times)

2344

2345

Bit6, Communication completion output indication

2346

2347

Bit8, PLCLINK suspension (0: Normal operation, 1: Operation paused)

2348

)))

2349

|S1+12|(% colspan="2" %)Auto check mode (Reserved)|(((

2350

0: No check; 1: Automatic check mode; 2: Automatic check in progress.

2351

2352

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.

2353

)))

2354

|S1+13|(% colspan="2" %)Corresponding station number communication switch 1|(((

2355

The switch control of station 1 to 15

2356

2357

Bit0: ON: Station NO. 0 (broadcast) normal communication

2358

2359

OFF: Station NO.0 (broadcast) communication prohibited (broadcast prohibited)

2360

2361

Bit1: ON: Station NO.1 normal communication;

2362

2363

OFF: Station NO.1 communication prohibited

2364

2365

Bit2: ON: Station NO.2 normal communication;

2366

2367

OFF: Station NO.2 communication prohibited

2368

)))

2369

|S1+14|(% colspan="2" %)Corresponding station number communication switch 2|The switch control of station 16 to 31

2370

|S1+15|(% colspan="2" %)Reserved|

2371

|S1+16|(% colspan="2" %)Reserved|

2372

|S1+17|(% colspan="2" %)Reserved|

2373

|S1+18|(% colspan="2" %)Reserved|

2374

|S1+19|(% colspan="2" %)Reserved|

2375

|S1+20|(% colspan="2" %)Reserved|

2376

|S1+21|Station NO.1|Read/write direction|(((

2377

• 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

2386

|S1+23|Station NO.2|Address type distinction|(((

2387

•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

2388

2389

•Distinguish the type of the starting device for storing data in the main station.

2390

2391

Main station address type distinction. 0: word address; 1: bit address

2392

)))

2393

|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.

2394

|S1+25|(% colspan="2" %)Data length|• Valid word. Range 1 to 126(bit data), 1 to 2,032(bit data)

2395

|S1+26|Station NO.1|Read/write direction|(% rowspan="5" %)(((

2396

The second data transmission description.

2397

2398

Main station address type distinction.

2399

)))

2400

|S1+27|(% colspan="2" %)The data start address of station NO.1

2401

|S1+28|Station NO.2|Address type distinction

2402

|S1+29|(% colspan="2" %)The data start address of station NO.2

2403

|S1+30|(% colspan="2" %)Data length

2404

|•|(% colspan="2" %) |　

2405

|•|(% colspan="2" %) |　

2406

|S1+20+ n×5|(% colspan="2" %)Reserved|• n is the total number of data transmission commands.

2407

2408

**{{id name="_Toc27709"/}}✎Note: **

2409

2410

1. It is forbidden to modify S0 to S4.

2411

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.

2412

2413

**{{id name="_Toc18822"/}}Error code**

2414

2415

(% class="table-bordered" %)

2416

|(% style="width:105px" %)**Error code**|(% style="width:976px" %)**Contents**

2417

|(% style="width:105px" %)31C0H|(% style="width:976px" %){{id name="OLE_LINK129"/}}Abnormal PLCLINK header. Re-download the program.

2418

|(% style="width:105px" %)31C1H|(% style="width:976px" %)PLCLINK function is not supported by COM port currently.

2419

|(% style="width:105px" %)31C2H|(% style="width:976px" %)PLCLINK table version is incompatible. Re-download the program.

2420

|(% style="width:105px" %)31C3H|(% style="width:976px" %)The number of PLCLINK command exceeds the range. The value ranges from 1 to 255 Currently.

2421

|(% 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.

2422

|(% style="width:105px" %)31C5H|(% style="width:976px" %)PLCLINK table exceeds the range of device. Check the corresponding device range of table.

2423

|(% 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.

2424

|(% 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.

2425

|(% 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.

2426

|(% 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.

2427

|(% 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.

2428

|(% style="width:105px" %)3186H|(% style="width:976px" %){{id name="OLE_LINK135"/}}COM2 function code error. Check whether the function code is supported by PLC.

2429

|(% style="width:105px" %)3187H|(% style="width:976px" %)COM2 address error.

2430

|(% 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.

2431

|(% 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)

2432

|(% 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)

2433

|(% 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)

2434

|(% 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)

2435

|(% style="width:105px" %)318DH|(% style="width:976px" %)COM2 slave station confirmation. Slave station returns message: Slave station confirmation.(Please refer to Modbus abnormal 05)

2436

|(% 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.

2437

|(% style="width:105px" %)3190H|(% style="width:976px" %)The data received by COM2 exceeds the cache limit.

2438

2439

**{{id name="_Toc25970"/}}Example**

2440

2441

Create a PLCLINK table and automatically switch the Com2 protocol to PLCLINK.

2442

2443

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

2444

[[image:10_html_c4962fb2076781b9.png||class="img-thumbnail"]]

2445

2446

{{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.

2447

2448

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

2449

[[image:10_html_3244c013d7d800c3.png||class="img-thumbnail"]]

2450

2451

{{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.

2452

2453

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

2454

[[image:10_html_ae5ef70ce179ad5e.png||class="img-thumbnail"]]

2455

2456

**{{id name="_Toc27083"/}}The situation of connecting more than one**

2457

2458

When adding commands, the station number that corresponding more slave station number can add more station number communication connections

2459

2460

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

2461

[[image:10_html_98f836562979721.png||class="img-thumbnail"]]

2462

2463

== {{id name="_Toc7760"/}}**Wecon Modbus protocol description** ==

2464

2465

The current Wecon Modbus protocol description (special protocol) is modified based on the ModbusRTU protocol.

2466

2467

Therefore, 7-bit data bits cannot be used in the serial port parameter part.

2468

2469

The protocol of COM0 and COM1 can only use WECON Modbus protocol at present and cannot be changed.

2470

2471

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.

2472

2473

The extended function is mainly used to communicate with PLCEDITOR.

Wiki source code of 10 Communication

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