Mitsubishi Electric MELSEC iQ-RJ71C24-R4

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INTRODUCTION

Thank you for purchasing the Mitsubishi Electric MELSEC iQ-R series programmable controllers.

This manual describes the frame specifications and MODBUS standard functions to use the MODBUS slave function and

MODBUS/TCP slave function of the following modules.

Before using this product, please read this manual and the relevant manuals carefully and develop familiarity with the

functions and performance of the MELSEC iQ-R series programmable controller to handle the product correctly.

Relevant products

RJ71C24, RJ71C24-R2, RJ71C24-R4

RJ71EN71, R04ENCPU, R08ENCPU, R16ENCPU, R32ENCPU, R120ENCPU

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

Mitsubishi Electric MELSEC iQ-RJ71C24-R4 - Introduction

Table of Contents

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