Mitsubishi Electric MELSEC iQ-RJ71C24-R2

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INDEX

Abnormal response function code list . . . . . . . . . 50

Descriptions of request message and response

message formats

. . . . . . . . . . . . . . . . . . . . . . . 11

Exception code list . . . . . . . . . . . . . . . . . . . . . . 51

Master . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Slave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Storage locations of exception code and error code12

Main Page

Default Chapter3
- Conditions of Use for the Product3
- Safety Precautions3
- Introduction4
- Table of Contents5
- Generic Terms and Abbreviations7
- Relevant Manuals7
- Terms7
Chapter 1 Frame Specifications8
MODBUS Protocol Frame Specifications8
- RTU Mode8
- ASCII Mode10
MODBUS/TCP Protocol Frame Specifications12
Protocol Data Unit Formats Grouped by Function13
Chapter 2 Modbus Standard Function List15
Chapter 3 Modbus Standard Function Details16
Read Coils (FC: 01H)16
Read Discrete Inputs (FC: 02H)17
Read Holding Registers (FC: 03H)18
Read Input Registers (FC: 04H)19
Write Single Coil (FC: 05H)20
Write Single Register (FC: 06H)21
Read Exception Status (FC: 07H)22
Diagnostics (FC: 08H)23
- Return Query Data (Sub-Function Code: 00H)24
- Restart Communications Option (Sub-Function Code: 01H)25
- Return Diagnostic Register (Sub-Function Code: 02H)26
- Change ASCII Input Delimiter (Sub-Function Code: 03H)27
- Force Listen Only Mode (Sub-Function Code: 04H)28
- Clear Counters and Diagnostic Register (Sub-Function Code: 0AH)29
- Return Bus Message Count (Sub-Function Code: 0BH)30
- Return Bus Communication Error Count (Sub-Function Code: 0CH)31
- Return Bus Exception Error Count (Sub-Function Code: 0DH)32
- Return Slave Message Count (Sub-Function Code: 0EH)33
- Return Slave no Response Count (Sub-Function Code: 0FH)34
- Return Slave NAK Count (Sub-Function Code: 10H)35
- Return Slave Busy Count (Sub-Function Code: 11H)36
- Return Bus Character Overrun Count (Sub-Function Code: 12H)37
- Return IOP Overrun Error Count (Sub-Function Code: 13H)38
- Clear Overrun Counter and Flag (Sub-Function Code: 14H)39
Get Communications Event Counter (FC: 0BH)40
Get Communications Event Log (FC: 0CH)41
Write Multiple Coils (FC: 0FH)43
Write Multiple Registers (FC: 10H)44
Report Slave ID (FC: 11H)45
Read File Record (FC: 14H) (SC: 06H)47
Write File Record (FC: 15H) (SC: 06H)49
Mask Write Register (FC: 16H)50
Read/Write Multiple Registers (FC: 17H)51
Chapter 4 Exception Codes52
Index54
- Revisions56
- Warranty57
- Trademarks58

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