10 Communication instruction

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**

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

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" %)__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" %)__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)|Module number, the first module is 0, the second module is 1, and so on|0 to 32767|Unsigned BIN 16 bit|ANY16

755

|(s2)|Start writing from which BFM in the module|0 to 32767|Unsigned BIN 16 bit|ANY16

756

|(s3)|Start number of the device storing the written data|-32768 to 32767|Signed BIN 16 bit|ANY16

757

|(N)|Number of data written|0 to 512|Unsigned BIN 16 bit|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:432px" %)Module number, the first module is 0, the second module is 1, and so on|(% style="width:156px" %)0 to 32767|(% style="width:154px" %)Unsigned BIN 16 bit|(% style="width:230px" %)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)|Module number, the first module is 0, the second module is 1, and so on|0 to 32767|Unsigned BIN 16 bit|ANY16

1012

|(s2)|Start reading from which BFM in the module|0 to 32767|Unsigned BIN 16 bit|ANY16

1013

|(d)|Start number of the device storing the read data|-|Signed BIN 32 bit|ANY32

1014

|(N)|Number of read data|0 to 256|Unsigned BIN 16 bit|ANY16

**Device used**

(% class="table-bordered" %)

**Pulse**

**extension**

)))

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

1025

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

1026

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

1027

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

1028

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

**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.

1033

1034

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

1035

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

1036

1037

As the following Circuit program

1038

1039

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

1040

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

1041

1042

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.

1043

1044

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

1045

1046

The special soft components used are as follows:

1047

1048

(% class="table-bordered" %)

1049

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

1050

|SD2081|Total number of modules

1051

|SD2082|Number of IO expansion modules

1052

|SD2083|Number of special expansion modules

1053

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

**Error code**

(% class="table-bordered" %)

1058

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

1059

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

1060

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

1061

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

1062

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

1063

|7081H|Expansion module communication message is abnormal

1064

|7082H|FROM/TO instruction error

1065

|7083H|The specified extension module was not found

**Example**

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

1070

[[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

1075

1076

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

1077

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

1078

1079

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

1080

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

1081

1082

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

1083

1084

== {{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** ==

1085

1086

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

1087

1088

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.

1089

1090

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.

1091

1092

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

1093

1094

**{{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.

1099

1100

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

1101

1102

**Content, range and data type**

1103

1104

(% class="table-bordered" %)

1105

1106

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

1107

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

1108

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

1109

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

1110

1111

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

1112

1113

(% class="table-bordered" %)

**Pulse**

**extension**

)))

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

1120

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

1121

|Parameter 2|●|●|●|●|●|●| |

1122

|Parameter 3|●|●|●|●|●|●| |

1123

|Parameter 4|●|●|●|●|●|●| |

1124

1125

**✎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.

1126

1127

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

1128

1129

Special address table

1130

1131

(% class="table-bordered" %)

1132

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

1133

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

1134

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

1135

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

1136

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

1137

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

1138

|2595|Station number modification logo|2595|

1139

|2596|(((

1140

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

1141

1142

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

1143

)))|2596|

1144

|2597|(((

1145

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

1146

1147

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

1148

)))|2597|

1149

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

1150

|2599|(((

1151

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

1152

1153

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

1154

)))|2599|

1155

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

1156

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

1157

|...| |...|

1158

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

1159

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

1160

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

1161

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

1162

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

1163

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

1164

1165

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

1166

1167

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

1168

1169

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

1170

1171

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

1172

1173

(% class="table-bordered" %)

1174

|(% 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)

1186

1187

(1,1): Even parity (EVEN)

1188

)))|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

1201

1202

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.

1203

1204

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.

1205

1206

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

1207

1208

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

1209

1210

(% class="table-bordered" %)

1211

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

1212

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

1213

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

1214

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

1215

1216

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

1217

1218

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

1219

1220

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

1221

1222

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

1223

1224

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.

1225

1226

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

1227

1228

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

1229

1230

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

1231

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

1232

1233

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.

1234

1235

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

1236

1237

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.

1238

1239

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

1240

1241

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

1242

1243

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

1244

1245

Currently this setting is only available for custom protocols.

1246

1247

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.

1248

1249

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

1250

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

1251

1252

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

1253

1254

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

1255

1256

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

1257

1258

**1) Host computer interface settings**

1259

1260

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

1261

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

1262

1263

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

1264

1265

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

1266

1267

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.

1268

1269

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

1270

1271

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

-[PORTPARA (s) (N)]

**Content, range and data type**

1276

1277

(% class="table-bordered" %)

**Data type**

**(label)**

)))

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

1284

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

1285

1286

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

1287

1288

(% class="table-bordered" %)

**Pulse**

**extension**

)))

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

1295

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

1296

|Parameter 2|●|●|●|●|●|●|●|●|●|●|●|●

1297

1298

Function: To set communication parameters when running.

1299

1300

Please refer to "PORTPARA instruction description" for details.

1301

1302

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

-[PROTOCOL (s) (N)]

**Content, range and data type**

1307

1308

(% class="table-bordered" %)

1309

1310

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

1311

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

1312

1313

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

1314

1315

(% class="table-bordered" %)

1316

|(% 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**

1326

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

1327

|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

1332

1333

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.

1334

1335

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

1336

1337

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

1338

1339

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.

1340

1341

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

1342

1343

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

1344

1345

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.

1346

1347

**(4) Ladder program**

1348

1349

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

1350

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

1351

1352

(((

1353

Set serial port parameters:

1354

1355

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

1356

1357

Set protocol to custom protocol

1358

1359

Sending interval: 5ms

1360

1361

Receiving timeout: 100ms

1362

1363

Number of repetitions: 3 times

1364

1365

Characters interval timeout: 30ms

1366

1367

Custom protocol sending start address D200, sending length 8.

1368

1369

Receiving start address D300, receiving length 6

1370

1371

Send directly after trigger

1372

1373

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

1374

)))

1375

1376

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

1377

1378

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

1379

1380

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

1381

1382

①16-bit (SM2594 is OFF)

1383

1384

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.

1385

1386

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

1387

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

1388

1389

1390

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

1391

[[image:10_html_8e673e3933d24e02.gif||class="img-thumbnail"]]

1392

1393

②8-bit (SM2594 is ON)

1394

1395

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

1396

1397

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

1398

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

1399

1400

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

1401

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

1402

1403

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

1404

1405

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

1406

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

1407

1408

Receiving will also be stored in the lower address

1409

1410

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

1411

1412

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

1413

1414

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

1415

1416

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

1417

1418

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.

1419

1420

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

1421

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

1422

1423

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

1424

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

1425

1426

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

1427

1428

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.

1429

1430

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

1431

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

1432

1433

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

1434

1435

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

1436

1437

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

1438

1439

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

1440

1441

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

1442

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

1443

1444

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

1445

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

1446

1447

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

1448

1449

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.

1450

1451

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

1452

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

1453

1454

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

1455

1456

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.

1457

1458

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

1459

1460

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

1461

1462

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

1463

1464

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.

1465

1466

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.

1467

1468

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].)

1469

1470

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.

1471

1472

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.

1477

1478

**✎**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.

1479

1480

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

1481

1482

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.

1483

1484

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

1485

1486

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.

1487

1488

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

1489

1490

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.

1491

1492

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

1493

1494

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

1495

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

1496

1497

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.

1498

1499

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

1500

1501

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

1502

1503

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.

1504

1505

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

1506

1507

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.

1508

1509

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

1510

1511

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

1512

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

1513

1514

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

1515

1516

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

1517

1518

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.

1519

1520

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.

1521

1522

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

1523

1524

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.

1525

1526

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.

1527

1528

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

1529

1530

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

1531

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

1532

1533

(((

1534

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.

1535

1536

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.

1537

)))

1538

1539

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

1540

1541

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

1542

1543

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

1544

1545

(% class="table-bordered" %)

1546

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

1547

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

1548

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

1549

|(% 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)"

1550

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

1551

Current protocol does not support this instruction

1552

1553

(This error is only displayed on SD7 and SD0)

1554

)))

1555

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

1556

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

1557

1558

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

1559

1560

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

1561

1562

**10.7.1.5 The difference with Mitsubishi**

1563

1564

The current differences:

1565

1566

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

1567

1. Add sum check and CR, LF.

1568

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.

1569

1570

== **Modbus protocol description** ==

**Introduction**

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

1575

1576

**Basic configuration**

**(1) Introduction**

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

1581

1582

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

1583

1584

**Content, range and data type**

1585

1586

(% class="table-bordered" %)

1587

1588

|(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

1589

|(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

1590

|(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

1591

1592

1593

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

1594

1595

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

**Pulse**

**extension**

)))

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

1602

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

1603

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

1604

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

1605

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

1606

1607

**✎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.

1608

1609

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

1610

1611

Special address table

1612

1613

(% class="table-bordered" %)

1614

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

1615

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

1616

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

1617

|2542|

1618

|2543|

1619

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

1620

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

1621

1622

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

1623

1624

(% class="table-bordered" %)

1625

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

1626

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

1627

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

1628

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

1629

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

1630

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

1631

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

1632

|2596|(((

1633

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

1634

1635

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

1636

)))|2596|

1637

|2597|(((

1638

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

1639

1640

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

1641

)))|2597|

1642

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

1643

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

1644

|2600|STX value|2600|

1645

|2601|ETX value|2601|

1646

|...| |...|

1647

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

1648

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

1649

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

1650

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

1651

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

1652

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

1653

1654

{{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.

1655

1656

**1) Communication port setting SD2590**

1657

1658

(% class="table-bordered" %)

1659

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

1660

1661

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

b2,b1

(0,0): None

(0,1): Odd parity (ODD)

1667

1668

(1,1): Even parity (EVEN)

1669

)))|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

1682

1683

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.

1684

1685

{{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.

1686

1687

**2) Protocol setting SD2592**

1688

1689

(% class="table-bordered" %)

1690

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

1691

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

1692

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

1693

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

1694

1695

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.

1696

1697

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

1698

1699

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.

1700

1701

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

1702

1703

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

1704

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

1705

1706

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.

1707

1708

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

1709

1710

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.

1711

1712

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

1713

1714

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

1715

1716

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

1717

**Serial port parameter setting**

1718

1719

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

1720

**PORTPARA instruction**

-[PORTPARA (s) (N)]

**Content, range and data type**

1725

1726

(% class="table-bordered" %)

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

1732

1733

(% class="table-bordered" %)

1734

|(% 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**

1744

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

1745

|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**.**

1750

1751

**PROTOCOL instruction**

-[PROTOCOL (s) (N)]

**Content, range and data type**

1756

1757

(% class="table-bordered" %)

1758

1759

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

1760

|(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**

1771

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

1772

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

1773

1774

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

1775

1776

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

1777

1778

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

1779

1780

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. .

1781

1782

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

1783

1784

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

1785

1786

For details, please refer to "PROTOCOL instruction description"

1787

1788

**3) Host computer settings**

1789

1790

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

1791

1792

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

1793

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

1794

1795

Specialized protocol station number cannot be 0.

1796

1797

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

1798

1799

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

1800

1801

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

1802

1803

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

1804

1805

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

1806

1807

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

1808

1809

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.

1810

1811

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

1812

1813

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

1814

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

1815

1816

(((

1817

Serial port parameter setting

1818

1819

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

1820

1821

Communication protocol setting: ModbusRTU master station protocol

1822

1823

Sending interval: 5ms

1824

1825

Receiving timeout: 100ms

1826

1827

Timeout retry times: 3 times

1828

1829

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

)))

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

1835

1836

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

1837

1838

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.

1839

1840

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.

1841

1842

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.

1843

1844

Modbus master function list

1845

1846

(% class="table-bordered" %)

1847

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

1848

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

1849

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

1850

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

1851

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

1852

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

1853

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

1854

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

1855

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

1856

1857

(((

1858

Serial port parameter setting

1859

1860

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

Example:

)))

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

1866

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

1867

1868

(((

1869

Communication protocol setting: ModbusRTU master station protocol

1870

1871

Sending interval: 5ms

1872

1873

Receiving timeout: 100ms

1874

1875

Timeout retry times: 3 times

1876

1877

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

)))

As shown in the ladder program shown:

1883

1884

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

1885

1886

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

1887

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

1888

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

1889

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

1890

* 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.

1895

1896

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.

1897

1898

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

1899

1900

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.

1901

1902

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.

1903

1904

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

1905

1906

(% class="table-bordered" %)

1907

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

1908

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

1909

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

1910

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

1911

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

1912

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

1913

1914

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

1915

1916

(% class="table-bordered" %)

1917

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

1918

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

1919

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

1920

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

1921

|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

1922

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

1923

1924

Error response: refer to error response frame.

1925

1926

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

1927

1928

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

1929

1930

(% class="table-bordered" %)

1931

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

1932

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

1933

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

1934

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

1935

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

1936

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

1937

1938

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

1939

1940

(% class="table-bordered" %)

1941

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

1942

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

1943

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

1944

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

1945

|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

1946

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

1947

1948

Error response: See error response frame.

1949

1950

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

1951

1952

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

1953

1954

(% class="table-bordered" %)

1955

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

1956

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

1957

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

1958

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

1959

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

1960

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

1961

1962

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

1963

1964

(% class="table-bordered" %)

1965

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

1966

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

1967

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

1968

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

1969

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

1970

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

1971

1972

{{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.

1973

1974

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

1975

1976

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

1977

1978

(% class="table-bordered" %)

1979

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

1980

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

1981

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

1982

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

1983

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

1984

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

1985

1986

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

1987

1988

(% class="table-bordered" %)

1989

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

1990

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

1991

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

1992

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

1993

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

1994

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

1995

1996

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

1997

1998

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

1999

2000

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

2001

2002

(% class="table-bordered" %)

2003

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

2004

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

2005

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

2006

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

2007

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

2008

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

2009

|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

2010

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

2011

2012

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

2013

2014

(% class="table-bordered" %)

2015

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

2016

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

2017

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

2018

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

2019

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

2020

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

2021

2022

Error response: See error response frame.

2023

2024

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

2025

2026

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

2027

2028

(% class="table-bordered" %)

2029

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

2030

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

2031

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

2032

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

2033

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

2034

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

2035

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

2036

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

2037

2038

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

2039

2040

(% class="table-bordered" %)

2041

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

2042

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

2043

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

2044

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

2045

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

2046

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

2047

2048

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

2049

2050

**7) Error response frame**

2051

2052

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

2053

2054

(% class="table-bordered" %)

2055

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

2056

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

2057

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

2058

|3|Code|1 byte|1 to 4

2059

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

2060

2061

(% class="table-bordered" %)

2062

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

2063

|1|01|Unsupported function code

2064

|2|02|Wrong address or function code

2065

|3|03|Wrong length

2066

|4|04|Imperfect instruction

2067

|5|05|Address not allowed

2068

2069

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

2070

2071

(% class="table-bordered" %)

2072

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

(% class="table-bordered" %)

2083

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

2084

2085

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

2086

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

2087

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

2088

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

2089

|M0 to M8000|8000 bit|0x1000-0x2F3F|4096|16384

2090

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

2091

2092

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

2093

|X0 to X1023|1024 bit|0xE000-0xE3FF|57344|4096

2094

|Y0 to Y1023|1024 bit|0xF000-0xF3FF|61440|4096

**Error message**

Currently the Error code will be displayed on SD7 and SD0 and SD2611 and SD2612.

2099

2100

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

2101

2102

(% class="table-bordered" %)

2103

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

2104

|(% 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)

2105

|(% 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.

2106

|(% 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."

2107

|(% 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.

2108

|(% 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.

2109

|(% 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.

2110

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

2111

|(% 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

2112

|(% 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)

2113

|(% 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.

2114

|(% 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)"

2115

|(% 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)

2116

|(% 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)

2117

|(% 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)

2118

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

2119

|(% 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)

2120

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

2121

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

2122

|(% 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)

2123

|(% 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)

2124

2125

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

2126

2127

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

2128

2129

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

2130

2131

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).

2132

2133

The topological diagram is shown in the figure below.

2134

2135

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

2136

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

2137

2138

When using the PLCLINK function:

2139

2140

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

2141

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

2142

2143

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

2144

**(1) Create a table**

2145

2146

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

2147

2148

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

2149

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

2150

2151

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

2152

2153

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

2154

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

2155

2156

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

2157

2158

The number of PLCLINK protocol is H60.

2159

2160

(% class="table-bordered" %)

2161

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

2162

|**2H**|ModbusRTU slave station

2163

|**3H**|ModbusASCII slave station

2164

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

2165

|**20H**|ModbusRTU main station

2166

|**30H**|ModbusASCII main station

2167

|**60H**|PLCLINK protocol

2168

2169

Click "Yes" will generate an empty table MAIN.

2170

2171

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

2172

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

2173

2174

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

2175

2176

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

2177

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

2178

2179

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

2180

2181

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

2182

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

(2) Write the table

Write station number in

2187

2188

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

2189

2190

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

2191

2192

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

2193

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

2194

2195

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

2196

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

2197

2198

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

2199

2200

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

2201

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

2202

2203

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

2204

2205

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

2206

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

2207

2208

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

2209

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

2210

2211

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

2212

2213

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

2214

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

2215

2216

The device address range limitations are as below.

2217

2218

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

2219

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.

2220

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.

2221

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.

2222

2223

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

2224

2225

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

2226

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

2227

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.

2228

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.

2233

2234

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

2235

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

2236

2237

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

2238

2239

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

2240

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

2241

2242

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.

2247

2248

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

2249

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

2250

2251

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.

2252

2253

(% 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.

2260

2261

{{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.

2262

)))

2263

2264

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.

2265

2266

(% class="table-bordered" %)

2267

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

2268

The switch control of station 1 to 15

2269

2270

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

2271

2272

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

2273

2274

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

2275

2276

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

2277

)))

2278

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

2279

2280

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

2281

2282

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

2283

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

2284

2285

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

2286

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

2287

2288

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

2289

2290

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

2291

2292

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

2293

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

2294

2295

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

2296

2297

(6) Slave station configuration

2298

2299

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

2300

2301

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

2302

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

2303

2304

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.

2305

2306

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

2307

2308

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.

2309

2310

(% class="table-bordered" %)

2311

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

2312

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

2313

2314

Bit2=1，One cycle has been executed.

2315

2316

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

2317

2318

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

2319

2320

Bit6，Communication completion output indication

2321

2322

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.

2328

2329

(% class="table-bordered" %)

2330

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

2331

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

2332

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

2333

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

2334

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

2335

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

2336

|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))

2337

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

2338

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

2339

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

2340

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

2341

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

2342

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

2343

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

2344

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

2345

2346

Bit2=1, One cycle has been executed.

2347

2348

Bit4, Communication transmission output indication

2349

2350

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

2351

2352

Bit6, Communication completion output indication

2353

2354

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

2355

)))

2356

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

2357

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

2358

2359

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.

2360

)))

2361

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

2362

The switch control of station 1 to 15

2363

2364

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

2365

2366

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

2367

2368

Bit1: ON: Station NO.1 normal communication;

2369

2370

OFF: Station NO.1 communication prohibited

2371

2372

Bit2: ON: Station NO.2 normal communication;

2373

2374

OFF: Station NO.2 communication prohibited

2375

)))

2376

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

2377

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

2378

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

2379

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

2380

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

2381

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

2382

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

2383

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

2384

• 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

2393

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

2394

•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

2395

2396

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

2397

2398

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

2399

)))

2400

|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.

2401

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

2402

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

2403

The second data transmission description.

2404

2405

Main station address type distinction.

2406

)))

2407

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

2408

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

2409

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

2410

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

2411

|•|(% colspan="2" %) |　

2412

|•|(% colspan="2" %) |　

2413

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

2414

2415

**{{id name="_Toc27709"/}}✎Note: **

2416

2417

1. It is forbidden to modify S0 to S4.

2418

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.

2419

2420

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

2421

2422

(% class="table-bordered" %)

2423

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

2424

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

2425

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

2426

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

2427

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

2428

|(% 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.

2429

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

2430

|(% 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.

2431

|(% 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.

2432

|(% 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.

2433

|(% 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.

2434

|(% 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.

2435

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

2436

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

2437

|(% 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.

2438

|(% 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)

2439

|(% 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)

2440

|(% 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)

2441

|(% 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)

2442

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

2443

|(% 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.

2444

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

2445

2446

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

2447

2448

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

2449

2450

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

2451

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

2452

2453

{{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.

2454

2455

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

2456

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

2457

2458

{{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.

2459

2460

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

2461

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

2462

2463

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

2464

2465

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

2466