Mitsubishi Electric MELSEC iQ-RJ71C24-R4

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4 DATA COMMUNICATION USING BIDIRECTIONAL PROTOCOL

4.1 Receiving Data from Target Device

■Program example

For information on the module FB to be used, refer to the following manual.

MELSEC iQ-R Serial Communication Module Function Block Reference

Category Label name Description Device

Module label C24_1 Target module 

C24_1.stnCH1.bSet_Req_ReceptionRead CH1 Reception data read request X3

Label to be defined Define the global label as shown below.

(0) Specify the reception channel.

Specify the receive data quantity.

Set the BIDIN instruction execution direction.

(54) Abnormal completion

(56) Reset the abnormal completion flag by an external command.

Main Page

Default Chapter3
- Safety Precautions3
- Conditions of Use for the Product11
- Introduction12
- Table of Contents13
- Relevant Manuals20
- Terms20
Part 1 Basic Functions23
Chapter 1 Data Communication Using MC Protocol24
Accessing to CPU Module Using MC Protocol24
- File Access Method25
Data Communication25
- Formats and Codes25
- Frames26
- Parameter Settings for MC Protocol Communication26
- Applicability of Multiple CPU Systems26
- Applicability of Remote Password Function27
- Using MX Component27
Chapter 2 Data Communication Using Predefined Protocol28
Data Communication Procedure29
Communication Type of Protocols36
Packet37
- Packet Elements37
Execution Condition of Predefined Protocol Communication50
Chapter 3 Data Communication Using Nonprocedural Protocol54
Receiving Data from Target Device55
- Receiving Methods55
- Receive Area and Receive Data Arrangement59
- Program for Data Reception63
- Reception Error Detection and Check Methods67
- Receive Data Clear69
- Receive End Data Quantity and Receive End Code Settings76
Transmitting Data to Target Device79
- Sending Methods79
- Send Area and Send Data Arrangement80
- Program for Data Transmission82
- Transmission Error Detection and Check Methods86
Considerations for Data Communication87
Chapter 4 Data Communication Using Bidirectional Protocol88
Receiving Data from Target Device89
- Receiving Methods89
- Receive Area, Receive Data Arrangement and Contents90
- Program for Data Reception94
- Reception Error Detection and Check Methods97
- Receive Data Clear97
Transmitting Data to Target Device98
- Sending Methods98
- Send Area and Send Data Arrangement99
- Program for Data Transmission101
- Transmission Error Detection and Check Methods105
Processing When Simultaneous Transmission Is Performed During Full-Duplex Communications106
- Processing When Simultaneous Transmissions Occur106
- Processing of Transmitted/Received Data When Simultaneous Transmissions Occur107
Considerations for Data Communication109
Chapter 5 Debug Support Function111
Circuit Trace111
- Procedure for the Circuit Trace111
- Performing Circuit Trace112
- Circuit Trace Option Setting113
Protocol Execution Log Storage Function (for Predefined Protocol Only)115
- Checking with Engineering Tool116
- Checking with the Buffer Memory117
Part 2 Additional Functions119
Chapter 6 Using the Programmable Controller Cpu Monitoring121
Overview121
Programmable Controller CPU Monitoring Function122
- Data Registration for Using the Programmable Controller CPU Monitoring Function122
- CPU Module Monitoring Information123
- Monitoring Timing of CPU Module125
- Timings of Transmitting Monitoring Results to the Target Device126
- Transmission Methods of Monitoring Results and Data Transmitted to the Target Device129
- Data Arrangement of Device Information and Programmable Controller CPU Status Information132
- Execution Order for Using the Programmable Controller CPU Monitoring Function139
Settings for Using the Programmable Controller CPU Monitoring Function140
- Parameter Setting Items for the Programmable Controller CPU Monitoring Function140
- How to Register and Cancel the Programmable Controller CPU Monitoring Function144
Considerations for Using the Programmable Controller CPU Monitoring Function148
Chapter 7 Communications by the Modem Function150
Overview150
- Features151
- Function List153
System Configuration154
- System Configuration When Performing Data Communication with Target Device154
- Considerations for System Configurations155
Specifications of Modem Function157
- Applicability of Remote Password Function157
- List of Input/Output Signals for the Modem Function162
- Buffer Memory163
- Considerations for Using the Modem Function168
Startup of the Modem Function174
- Startup Procedure of the Modem Function174
- Initial Settings of Serial Communication Module176
- Register/Read/Delete Data for Initialization179
- Register/Read/Delete Data for Connection183
- Initialization of Modem/Ta (Terminal Adapter)187
- Line Connection192
- Data Communication201
- Line Disconnection204
Sample Program208
- Program for Data Communication208
Chapter 8 Receiving Data with an Interrupt Program221
Settings for Receiving Data Using an Interrupt Program221
Interrupt Program Startup Timing221
Reception Control Method Using an Interrupt Program222
Program Example223
Considerations When Receiving Data with an Interrupt Program225
Chapter 9 Changing Data Length Units to Byte Units (Word/Byte Units Setting)227
Chapter 10 Changing Data Communication Monitoring Time229
Reception Monitoring Time (Timer 0) Setting230
- C24 Operation by no Reception Monitoring Time (Timer 0)230
- Changing the No-Reception Monitoring Time (Timer 0)231
Response Monitoring Time (Timer 1) Setting233
- C24 Operation by Response Monitoring Time (Timer 1)233
- Changing the Response Monitoring Time (Timer 1)234
Send Monitoring Time (Timer 2) Setting235
- C24 Operation by Send Monitoring Time (Timer 2)235
- Changing the Send Monitoring Time (Timer 2)236
Transmission Wait Time Setting237
- C24 Operation by Transmission Wait Time237
- Changing the Transmission Wait Time237
Chapter 11 Data Communications Using DC Code Transmission Control238
Control Contents of DTR/DSR (ER/DR) Signal Control239
- C24 DTR Control Contents and Free os Area Specification239
- C24 DSR Control240
Control Contents of DC Code Control241
- DC1/DC3 Transmission Control, DC1/DC3 Reception Control241
- DC2/DC4 Transmission Control, DC2/DC4 Reception Control243
Considerations for Using Transmission Control Functions244
Chapter 12 Data Communications Using Half-Duplex Communications245
Half-Duplex Communications245
Data Transmission and Reception Timing246
Changing the Communication Method250
Connector Connections for Half-Duplex Communications250
Considerations for Half-Duplex Communications251
Chapter 13 Contents and Registration of User Frames for Data Communication252
User Frame Types and Contents During Communication252
- User Frames to be Registered and Used by the User252
- Default Registration Frame (Read Only)260
Transmission/Reception Processing Using User Frame Registration Data261
- Transmitting Data261
- Receiving Data262
Considerations for Registering, Reading, and Deleting User Frames264
Registering/Reading/Deleting User Frames266
Chapter 14 On-Demand Data Communications Using User Frames269
Data Communication Function Using User Frame269
User Frame On-Demand Data Transmission and Buffer Memory Used270
On-Demand Function Control Procedure During User Frame Use272
- Data Communication Using the ASCII Code272
- Data Communications Using the Binary Code274
Example of On-Demand Data Transmission Program Using User Frames276
Chapter 15 Data Communications Using User Frames278
Procedure of Data Communication279
Data Reception280
- Receive Data280
- Timing for Start/Completion of Data Reception286
- Reception Procedure290
- Setting of Receive User Frames291
Program for Data Reception with User Frame297
- Application Program for Data Reception Using a Combination that Specifies the Start Frame305
- Application Program for Data Reception Using a Combination that Does Not Specify the Start Frame312
Data Transmission315
- Send Data315
- Transmission Procedure316
- Settings of Send User Frames317
Application Program for Data Transmission Using a Combination that Does Not Specify the Start320
- Frame320
Chapter 16 Transparent Codes and Additional Codes328
Handling Transparent Code and Additional Code Data328
Registering Transparent Codes and Additional Codes329
Handling Transparent and Additional Codes for Nonprocedural Protocol Data Communication330
Data Communication Using Nonprocedural Protocol333
- Example of Data Reception334
- Example of Data Transmission337
Handling Transparent and Additional Codes for Bidirectional Protocol Data Communication341
Data Communication Using Bidirectional Protocol344
- Example of Data Reception345
- Example of Data Transmission347
Chapter 17 Communicating with Ascii Code (Ascii-Bin Conversion)349
ASCII-Binary Conversion349
Settings for ASCII-BIN Conversion349
ASCII-BIN Conversion for Data Communicated with Nonprocedural Protocol350
Data Communication Using Nonprocedural Protocol352
- Example of Data Reception353
- Example of Data Transmission357
ASCII-BIN Conversion for Data Communicated with Bidirectional Protocol361
Data Communication Using Bidirectional Protocol363
- Example of Data Reception364
- Example of Data Transmission366
Chapter 18 Data Communications between Target Device and Cpu Module in M:n Basis368
Considerations on Data Communications368
Arrangement for Interlock Among Target Devices370
- Maximum Communication Time Per Target Device Station370
- Message Structure When Communicating Data Among Target Devices371
Examples of Procedure for Data Communications with CPU Module373
- Sequential Data Communications between Target Devices and the CPU Module373
- Data Communications between Target Devices and CPU Module by Designating a Master Station and Slave Stations376
Chapter 19 Switching the Mode after Starting379
Mode Switching Operation and Contents that Can be Changed380
- Settings that Can be Changed with Mode Switching380
- Operation for Mode Switching380
Considerations for Mode Switching381
I/O Signals for Handshake with CPU Module and Buffer Memory382
Mode Switching Method by Program385
How to Switch Mode from Target Device387
Chapter 20 Using Send/Receive Data Monitoring Function389
Send/Receive Data Monitoring Function389
- Overview389
- Send/Receive Data Monitoring Operation390
Send/Receive Data Monitoring Function Settings392
- Buffer Memory for Send/Receive Data Monitoring Function393
Send/Receive Data Monitoring Example396
Chapter 21 Independent/Linked Operation of Interface399
Setting and Data Flow of Independent Operation399
Setting and Data Flow of Interlink Operation400
- Setting Example for MELSOFT Connection Via C24402
Chapter 22 Parameter Registration to Cpu Module403
Chapter 23 Rs-422/485 Interface Echo Back Enable/Prohibit Specification405
Chapter 24 Erroneous Noise Signal Reception Prevention Function407
- Erroneous Noise Signal Reception Prevention Function407
Setting for the Erroneous Noise Signal Reception Prevention Function408
Chapter 25 Automatic Removal of Null Characters Included in Send Data409
Automatic Removal of NULL Characters During Data Transmission409
Setting for NULL Character Automatic Removal Function409
NULL Character Removal to Send Data Using Nonprocedural Protocol410
Program Example412
- Program Example of Data Communication Using the Nonprocedural Protocol412
NULL Characters Removal for Send Data Using Bidirectional Protocol417
Program Example419
- Program Example of Data Communication Using the Bidirectional Protocol419
Part 3 Parameter Settings and Troubleshooting423
Chapter 26 Parameter Setting424
Parameter Setting Procedure424
Module Parameters425
- Basic Settings425
- Application Settings430
- Interrupt Settings435
- Refresh Setting436
Module Extended Parameter439
- User Frame Contents439
- Modem Initialization Data440
- Modem Connection Data441
Chapter 27 Troubleshooting442
Checking Module Status442
- Error Information442
- Module Information List443
- Intelligent Function Module Monitor447
- Error Information Clear450
- Individual Station Test451
- Loopback Test455
How to Clear Programmable Controller CPU Information457
Troubleshooting by Symptom459
- SD LED Does Not Flash Even after a Send Request was Made461
- RD LED Does Not Flash Even Though the Target Device Is Transmitting a Message461
- No Response Message Is Returned Even Though the Target Device Transmitted a Message and the RD LED Flashes462
- Read Request Signal Does Not Turn on Even Though the Target Device Transmitted a Message and the RD LED Flashes463
- The CPRTCL Instruction Execution Is Not Completed Although the RD LED Flashes464
- RUN LED Turns off465
- ERR LED Flashes465
- ERR LED Turns on466
- C ERR LED Turns on467
- Hardware Information Communication Error "SIO" Occurs468
- Hardware Information Communication Error "PRO." Occurs469
- Hardware Information Communication Error "P/S" Occurs470
- Hardware Information Communication Error "C/N" Occurs470
- Hardware Information Communication Error "NAK" Occurs471
- Communication Is Intermittent471
- Undecodable Data Are Transmitted or Received472
- Whether the Communication Error Is Caused on C24 or Target Device Is Unclear473
- Communication Is Not Established Via Modem473
- Communication Is Not Established with the ISDN Sub-Address When Using a Modem474
- Fixed Cycle Send Is Not Performed Normally474
- Condition Match Send Is Not Performed Normally474
- Data Cannot be Received by an Interrupt Program474
- Data Cannot be Written to Flash ROM474
Error Code List475
Event History List493
Appendix494
Appendix 1 Module Label494
Appendix 2 Input/Output Signal List495
Appendix 3 Buffer Memory498
- Buffer Memory List500
Appendix 4 Dedicated Instructions522
- Dedicated Instruction List522
Appendix 5 Operation Image and Data Structure of Predefined Protocol523
- Operation Image of each Communication Type of Protocol523
- Verification Operation of Receive Packet528
- Data Examples of Packet Elements529
Appendix 6 Processing Time545
Appendix 7 When Connecting the Module to a Remote Head Module547
- Restrictions547
- Communication Example548
Appendix 8 Added and Changed Functions566
Index567
- Revisions570
- Warranty571
- Trademarks572

Mitsubishi Electric MELSEC iQ-RJ71C24-R4 - Page 95

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