Mitsubishi Electric MELSEC iQ-R02CPU - Example of Communications with Random Access Buffer

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106

1 FUNCTIONS

1.6 Communications Using the Random Access Buffer

Example of communications with random access buffer

The following figure shows an example of the write operation from the external device.

 The receive completion flag is set at the end of the received data.

 The receive completion flag is monitored.

 When the receive completion flag turns on, the data is transferred from the random access buffer to the CPU module.

ÒÓ

D10000

D10009

21710

21719

21720

RJ71EN71

Data received

Device memory

Random access buffer

CPU module

External device

Receive completion flag

Program for receive processing

Main Page

Default Chapter3
- Design Precautions3
- Safety Precautions3
- Conditions of Use for the Product10
- Introduction10
- Table of Contents11
- Relevant Manuals15
- Terms16
Chapter 1 Functions19
Connection with MELSOFT Product and GOT19
- Connection Via a Hub19
SLMP Communications29
- Applications29
  - Data Read/Write29
  - File Read/Write29
- Communication Structure30
- Data Communication Procedures30
- List of Valid Commands32
- SLMP Reference Manual32
Communications Using the Predefined Protocol34
- Applicable Connections34
- Data Communication Procedures35
- Protocol Communication Type42
- Packet Elements43
- Execution Conditions of Predefined Protocol Communications50
- Example of Predefined Protocol Communications52
Socket Communications61
- Setting Procedure61
- List of Dedicated Instructions62
- Applicable Connections62
- Communication Structure63
- Communications Using TCP/IP64
- Communications Using UDP/IP67
- Precautions for UDP/IP Communications67
- Broadcast Communications68
- Precautions69
Communications Using the Fixed Buffer70
- Differences between the "Procedure Exist" and "No Procedure" Control Methods70
- Setting Procedure70
- Applicable Dedicated Instructions71
- Applicable Connections71
- Communication Structure71
- Send Procedure73
  - Procedure Exists73
  - No Procedure74
- Receive Procedure75
- Pairing Open79
- Broadcast Communications80
- Precautions80
- Data Format81
- Example of Communications Using the Fixed Buffer86
1.6 Communications Using the Random Access Buffer96
- Setting Procedure96
- Procedure for Reading from External Device97
- Communication Structure97
- Procedure for Writing from External Device98
- Physical Address and Logical Address of Random Access Buffer99
- Precautions99
- Data Format99
- Example of Communications with Random Access Buffer108
Communications Using MODBUS/TCP109
- Automatic Response Function110
- MODBUS Device Assignment Function111
- List of MODBUS Standard Functions117
Link Dedicated Instruction Communication118
- Applicable Dedicated Instructions118
- Data Communication Procedures119
File Transfer Function (FTP Server)120
- Data Communication Procedures121
- Files that Can be Transferred with FTP123
- FTP Command124
File Transfer Function (FTP Client)137
- File Transfer Specifications137
- Transferable Files138
- Procedure for Executing the File Transfer Function (FTP Client)139
- Precautions141
Time Setting Function (SNTP Client)143
- Communication Timeout144
- Delay by Communication Time144
- When Using Multi-CPU System Configuration144
Web Server Function145
- Javascript Objects146
- CGI Object160
- Error Message173
  - Display Example of Error Messages173
  - List of Error Messages of the User Web Page174
Security Function175
- IP Filter Function175
- Remote Password176
Simple CPU Communication Function (CPU Module (Built-In Ethernet Port Part))183
- Communication Pattern184
- Communication Setting and Execution Interval184
- Setting Procedure184
- Checking the Simple CPU Communication Status191
- Precautions193
- When the Communication Destination Is a Redundant System194
Simple CPU Communication Function (RJ71EN71, Rnencpu (Network Part))195
- Comm Patn196
- Setting Procedure196
  - Registration of Communication Destination197
  - Udp/Tcp198
- Checking the Simple CPU Communication Status209
- Precautions211
IP Address Change Function213
- IP Address of the Ethernet-Equipped Module214
- Usage Methods216
- Checking the IP Address219
- Checking the Operating Status219
- Precautions219
  - Write Processing and Clear Processing Execution Timing220
  - Communications by Network Number/Station Number220
Redundant System Function221
- System Configuration221
- System Switching Operation222
- System Switching Request to the Control System CPU Module223
- Redundant Group Setting225
  - Redundant Module Group Settings225
  - Port Group Setting226
- Communication Path Bypass Function227
- Both Systems Identical IP Address Setting Function228
  - Availability of Control System IP Address for each Function229
  - How to Use Dedicated Instructions229
- Functions Restricted in a Redundant System231
Chapter 2 Parameter Settings243
- Own Node Settings244
  - Communications by Network No./Station No.245
  - Enable/Disable Online Change245
- External Device Configuration246
- Existence Confirmation248
Setting Parameters243
Basic Settings243
Application Settings249
- RJ71EN71, Rnencpu (Network Part)249
- CPU Module (Built-In Ethernet Port Part)250
- Communication Speed252
- Frame Settings252
  - Jumbo Frame252
  - Current Password254
- FTP Server Settings254
  - FTP Timer Settings254
  - Password Setting254
- DNS Settings255
- FTP Client Settings255
  - Response Monitoring Timer255
  - CPU Response Monitoring Timer256
- MODBUS/TCP Settings256
- Device Assignment257
- Simple CPU Communication Setting (RJ71EN71, Rnencpu (Network Part))258
  - Execution Timing261
  - Specified Time (Hour, Minute, Day of Week)261
- Time Setting261
- Timer Settings for Data Communication262
  - Precautions for Settings263
  - Setting Value for each Timer of the External Device Side263
  - Number of Retries264
- Gateway Parameter Settings265
- IP Filter Settings265
- Security265
  - Gateway Information266
  - Gateway IP Address266
  - Subnet Address266
- Network/Station No. <-> IP Information Setting267
  - Setting System268
  - Automatic Response System269
  - IP Address Calculation Example270
  - IP Address Calculation System270
  - Table Conversion System271
  - Conversion Table Registration Example272
  - Combination System274
  - Conversion Settings274
  - Subnet Mask Pattern274
- Interrupt Settings275
- IP Packet Transfer Setting275
- Network Dynamic Routing276
- Module Operation Mode277
- Redundant System Settings278
- System B IP Address279
- Simple CPU Communication Setting (CPU Module (Built-In Ethernet Port Part))280
Chapter 3 Troubleshooting282
Checking with LED282
- When the ERROR LED or ERR LED Turns on or Is Flashing282
- When the RUN LED or READY LED Turns off282
- When Data Cannot be Received with the SD/RD LED off283
- When the L er LED Turns on283
- When the SD/RD LED Does Not Turn on at Data Sending283
Checking the Module Status284
- Error Information284
- Module Information List285
- Module Communication Test286
- Checking the Status and Result of Module Communication Test287
- Error Number When the Test Abnormally Ended287
Checking the Network Status288
- Ethernet Diagnostics288
- Simple CPU Communication Diagnostics296
- Communications Cannot be Performed with the External Device297
Troubleshooting by Symptom297
- Direct Connection to the Engineering Tool Is Not Possible299
- Communications Using the SLMP Cannot be Performed300
- CPU Module Search on the Network Cannot be Performed300
- Communications Using the Predefined Protocol Cannot be Performed301
- Communications Using the Random Access Buffer Cannot be Performed303
- A Response Message Cannot be Sent to the MODBUS/TCP Master Device304
- Communication Fails at MODBUS/TCP Connection304
- Communications Using MODBUS/TCP Cannot be Performed304
- A Dedicated Instruction Is Not Completed305
- Remote Password Does Not Work306
- The Access Cannot be Allowed/Denied Correctly by the IP Filter306
- Communications Using the Built-In Ethernet Port Are Slow307
- When the File Transfer Function (FTP Client) Is Used307
- When the Simple CPU Communication Function Is Used308
- The Update by Reading and Writing the Device Data Is Slow309
- System Switching Cannot be Performed Normally310
- When the Redundant System Function Is Used310
- Communication Fails at OPS Connection311
List of Error Codes312
List of Parameter Numbers329
- System Parameter329
Event List331
End Codes Returned to an External Device During Data Communications333
Appendices335
Appendix 1 Module Label335
- List of I/O Signals336
Appendix 2 I/O Signals336
- When the Network Type Is "Q Compatible Ethernet"337
- List of Buffer Memory Addresses338
Appendix 3 Buffer Memory338
- Buffer Memory Addresses Usable Only with RJ71EN71350
- When Using the RJ71EN71350
- Buffer Memory Addresses Not Supported by the RJ71EN71353
- Details of Buffer Memory Addresses (RJ71EN71, Rnencpu (Network Part))357
- Details of Buffer Memory Addresses (CPU Module (Built-In Ethernet Port Part))372
Appendix 4 Dedicated Instruction376
- File Transfer Function Instruction377
- Instruction for SLMP Communications377
- Instructions for Communications Using the Fixed Buffer377
- Socket Communications Instructions377
- Link Dedicated Instructions378
- Other Dedicated Instructions378
- Precautions for Dedicated Instructions379
Appendix 5 TCP/IP Communications, UDP/IP Communications380
- Communication Flow381
- Active Open Procedure382
- Open/Close Processing for Connection No.1382
- Passive Open Procedure383
- When "Do Not Open by Program" Is Set383
- When "Open by Program" Is Set384
- Open Procedure385
- UDP/IP Communications385
Appendix 6 Communications with Different Networks387
- When the Networks Consist of MELSEC Iq-R Series and Other Series388
- When the Networks Consist of Only MELSEC Iq-R Series388
- When the Networks Contain a Redundant System389
Appendix 7 Processing Time390
- Minimum Processing Time of Fixed Buffer Communications390
- Calculation Formula391
- Processing Time of Communications Using MODBUS/TCP391
- System Switching Time When a Redundant System Is Used392
- Timing Chart393
- Performance List of Simple CPU Communication Function394
- Module Parameter395
- Restricted Functions and Specifications395
Appendix 8 When Connecting the Module to a Remote Head Module395
Appendix 9 Port Numbers Used by Ethernet-Equipped Module396
- Operation Image of each Communication Type of Protocol397
- For "Send Only" Communication Type397
Appendix 10Operation Image and Data Structure of Predefined Protocol397
- For "Receive Only" Communication Type398
- When the Instruction Completed with an Error399
- For "Send & Receive" Communication Type400
- When the Instruction Completed Successfully400
- Verification Operation of Receive Packet402
  - When Multiple Receive Packets (Expected Packets) Are Specified402
  - When Received Data Are Matched with a Receive Packet402
- Example of Packet Element Data403
Appendix 11 Example of External Device Program406
Appendix 12How to Turn off ERR LED407
- Method Using a Dedicated Instruction407
- Method Using I/O Signals407
Appendix 13Added and Enhanced Functions408
Index410
- Revisions412
- Warranty413
- Trademarks414

Mitsubishi Electric MELSEC iQ-R02CPU - Example of Communications with Random Access Buffer

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