Mitsubishi QJ71MT91 User Manual

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Table of Contents

Questions and Answers:

R
Ricardo GonzalezAug 2, 2025
What to do if the ERR. LED turned on on Mitsubishi QJ71MT91 Controller?
- C
  Cody CowanAug 2, 2025
  If the ERR LED is on for your Mitsubishi Controller, it could be due to a few reasons. First, examine the intelligent function module switch 1 (operation mode setting) value, ensuring it's within the correct setting range. If not, correct the value. Also, verify that the QJ71MT91 is mounted with the Q mode QCPU. If it is not, mount it correctly. Finally, check if the module is in the hardware or self-loopback test mode. Try restarting the test, ensuring the QJ71MT91 is properly mounted. If the ERR LED persists, it may indicate a hardware fault, necessitating replacement of the QJ71MT91.
D
Deborah DunnAug 17, 2025
Why is the RUN LED turned off on my Mitsubishi Controller?
- T
  Terry JonesAug 17, 2025
  If the RUN LED on your Mitsubishi Controller is off, it could be due to several reasons. First, ensure the QJ71MT91 is correctly mounted by switching off the power and remounting it. Another potential cause is insufficient power supply capacity, which can be resolved by changing the power supply module. The issue may also stem from a faulty programmable controller CPU; if this is the case, troubleshoot according to the QCPU User's Manual (Hardware Design, Maintenance and Inspection). Finally, check for a watch dog timer error (X1F). To resolve this, try resetting the programmable controller CPU or power cycling it. If the problem continues, it might be a hardware fault, so perform a hardware test and replace the QJ71MT91.

Mitsubishi QJ71MT91 Specifications

General

Communication Protocol	MELSECNET/H
Number of Ports/Connections	1
Data Rate/Transmission Speed	10 Mbps
Number of Connectable Stations	64
Occupied Slot	1
Weight	0.2 kg
Model	QJ71MT91
Power Supply	5 V DC
Type	MELSECNET/H communication module
Compatible Controllers	MELSEC-Q Series

Summary

SAFETY PRECAUTIONS

Design Precautions

Precautions related to the design of the system using the module.

Installation Precautions

Safety precautions to be taken during module installation.

Wiring Precautions

Safety precautions for wiring the module and cables correctly.

Setup and Maintenance Precautions

Precautions for setting up and maintaining the module.

Operating Precautions

Precautions to be observed during the operation of the module.

Disposal Precautions

Guidelines for the proper disposal of the product.

REVISIONS

Japanese Manual Version SH(NA)-080445-G

Identifies the specific version of the Japanese manual.

INTRODUCTION

CONTENTS

Table of contents outlining the manual's sections and page numbers.

1 OVERVIEW

1.1 Features

Highlights the main features and functionalities of the QJ71MT91.

2 SYSTEM CONFIGURATION

2.1 Applicable Systems

Details on the applicable CPU modules and base units for the QJ71MT91.

3 SPECIFICATIONS

3.1 Performance Specifications

Lists the performance characteristics and technical specifications of the QJ71MT91.

4 MODBUS® STANDARD FUNCTIONS

4.1 MODBUS® Standard Function Support List

Lists the MODBUS® standard functions supported by the QJ71MT91.

5 FUNCTIONS

5.1 Function List

Provides a list of all functions supported by the QJ71MT91 module.

6 PRE-OPERATIONAL PROCEDURES AND SETTING

6.1 Handling Precautions

Precautions to be taken when handling the QJ71MT91 module.

7 PARAMETER SETTING

7.1 Parameter Settings and Setting Procedure

Explains the types of parameters and the procedures for setting them.

8 UTILITY PACKAGE (GX Configurator-MB)

8.1 Functions of the Utility Package

Lists the functions provided by the GX Configurator-MB utility package.

9 PROGRAMMING

9.1 Parameter Setting

Describes how to set parameters using sequence programs.

10 DEDICATED INSTRUCTIONS

10.1 Dedicated Instruction List and Available Devices

Lists the dedicated instructions supported by the QJ71MT91 and their available devices.

11 TROUBLESHOOTING

11.1 Troubleshooting

Explains error details and corrective actions for common issues.

APPENDICES

Appendix 1 External Dimensions

Provides the external dimensions of the QJ71MT91 module.

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