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Mitsubishi Electric QJ71MB91 User Manual

Mitsubishi Electric QJ71MB91
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MODBUS Interface Module User's Manual
-QJ71MB91
-GX Configurator-MB (SW1D5C-QMBU-E)

Table of Contents

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Mitsubishi Electric QJ71MB91 Specifications

General IconGeneral
Number of Ports/Channels1
Power Supply24 VDC
Transmission Speed (TCP)10/100 Mbps
Station TypeMaster/Slave
Operating Temperature0 to 55 °C
Storage Temperature-25 to 75°C
Weight0.2 kg
CompatibilityMELSEC-Q Series
Communication ProtocolModbus/TCP, Modbus/RTU
Number of Connectable Stations32
Maximum Number of Connections8
Data Bit8 bits
Stop Bit1 or 2 bits (Modbus/RTU)
Parity BitNone, Even, Odd
Connection TerminalRJ45 (TCP/IP), Terminal block (RTU)
Isolation MethodPhotocoupler isolation

Summary

Safety Precautions

Design Precautions

Guidelines for safe design and implementation of the programmable controller system, including interlocks and prohibited operations.

Conditions of Use for the Product

Chapter 4 MODBUS Standard Functions

Chapter 5 Functions

Chapter 6 Pre-Operational Procedures and Settings

Pre-Operational Procedures and Settings

Step-by-step guide for system setup, including hardware tests and parameter configuration.

Wiring Connections to Target Devices

Explains wiring precautions for RS-232 and RS-422/485 interfaces, including shields and terminating resistors.

Chapter 7 Parameter Setting

Parameter Settings and Setting Procedures

Details parameter types (automatic communication, MODBUS device assignment) and setting methods.

Chapter 8 Utility Package (GX Configurator-MB)

Chapter 9 Programming

Chapter 10 Dedicated Instructions

Z(P).MBRW Instruction for Data Read/Write

Explains how to use the MBRW instruction for reading/writing MODBUS device data.

Z(P).MBREQ Instruction for Slave Communication

Details the MBREQ instruction for slave communication using custom request message formats.

Chapter 11 Troubleshooting

Troubleshooting Common Symptoms and Errors

Provides a comprehensive list of symptoms, check points, and corrective actions for module errors.

Checking QJ71MB91 Module Status

Explains methods to check module status via LEDs, GX Configurator-MB, and system monitor.

Checking QJ71MB91 Communication Status

Details diagnostic counters for monitoring communication status in master and slave functions.

Error Code Lists and Storage Areas

Explains error code storage areas, device types, and lists common error codes with their definitions and actions.

Appendix 3: Processing Time Calculations

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