Contents

SAFETY PRECAUTIONS
CONDITIONS OF USE FOR THE PRODUCT
REVISIONS
INTRODUCTION
CONTENTS
COMPLIANCE WITH THE EMC AND LOW VOLTAGE DIRECTIVES
THE MANUAL'S USAGE AND STRUCTURE
ABOUT THE GENERIC TERMS AND ABBREVIATIONS
MEANINGS AND DEFINITIONS OF TERMS
PRODUCT CONFIGURATION
1 OVERVIEW
- 1.1 Features
2 SYSTEM CONFIGURATION
- 2.1 Applicable Systems
- 2.2 Devices Necessary for Network Configuration
- 2.3 System Configuration and Access Range
- 2.4 Precautions for System Configuration
- 2.5 Checking Function Version and Software Version
3 SPECIFICATIONS
- 3.1 Performance Specifications
- 3.2 I/O Signals for Programmable Controller CPU
  - 3.2.1 I/O signal list
- 3.3 Applications and Assignment of Buffer Memory
  - 3.3.1 Buffer memory list
4 MODBUS STANDARD FUNCTIONS
- 4.1 MODBUS Standard Function Support List
- 4.2 Frame Specifications
- 4.3 PDU Formats by Functions
  - 4.3.1 Read coils (FC: 01)
  - 4.3.2 Read discrete inputs (FC: 02)
  - 4.3.3 Read holding registers (FC: 03)
  - 4.3.4 Read input registers (FC: 04)
  - 4.3.5 Write single coil (FC: 05)
  - 4.3.6 Write single register (FC: 06)
  - 4.3.7 Write multiple coils (FC: 15)
  - 4.3.8 Write multiple registers (FC: 16)
  - 4.3.9 Read file record (FC: 20) (SC: 06)
  - 4.3.10 Write file record (FC: 21) (SC: 06)
  - 4.3.11 Mask write register (FC: 22)
  - 4.3.12 Read/Write multiple registers (FC: 23)
5 FUNCTIONS
- 5.1 Function List
- 5.2 Master Function
  - 5.2.1 Automatic communication function
  - 5.2.2 Dedicated instructions
- 5.3 Slave Function
  - 5.3.1 Automatic response function
  - 5.3.2 MODBUS device assignment function
- 5.4 KeepAlive Function
- 5.5 Router Relay Function
- 5.6 GX Developer Connection Function
6 PRE-OPERATIONAL PROCEDURES AND SETTING
- 6.1 Handling Precautions
- 6.2 Pre-Operational Procedures and Setting
- 6.3 Part Names
- 6.4 Connection to Ethernet
- 6.5 Unit Tests
  - 6.5.1 Hardware test
  - 6.5.2 Self-loopback test
- 6.6 Intelligent Function Module Switch Setting
  - 6.6.1 Communication starting conditions depending on basic parameter/MODBUS device assignment parameter starting method setting
7 PARAMETER SETTING
- 7.1 Parameter Settings and Setting Procedure
- 7.2 Basic Parameters
  - 7.2.1 Basic parameters details
  - 7.2.2 TCP/UDP/IP setting
  - 7.2.3 GX Developer connection information setting
  - 7.2.4 MODBUS/TCP setting
- 7.3 Automatic Communication Parameters
  - 7.3.1 Automatic communication parameters details
- 7.4 MODBUS Device Assignment Parameters
  - 7.4.1 MODBUS device sizes
  - 7.4.2 MODBUS device assignment parameters details
  - 7.4.3 Default assignment parameters
  - 7.4.4 MODBUS extended file register assignment
  - 7.4.5 QJ71MT91 buffer memory assignment
8 UTILITY PACKAGE (GX Configurator-MB)
- 8.1 Functions of the Utility Package
- 8.2 Installing and Uninstalling the Utility Package
  - 8.2.1 Handling precautions
  - 8.2.2 Operating environment
- 8.3 Utility Package Operation
  - 8.3.1 Common utility package operations
  - 8.3.2 Operation overview
  - 8.3.3 Starting the Intelligent function module utility
- 8.4 Initial Setting
- 8.5 Auto Refresh Setting
- 8.6 Monitor/Test
  - 8.6.1 X/Y Monitor/test
  - 8.6.2 Basic/MODBUS device assignment parameter status
  - 8.6.3 Automatic communication status
  - 8.6.4 Error log
  - 8.6.5 Communication status
  - 8.6.6 PING test
- 8.7 Parameter Setting Using GX Configurator-MB
  - 8.7.1 Basic parameters
  - 8.7.2 Automatic communication parameters
  - 8.7.3 MODBUS device assignment parameters
9 PROGRAMMING
- 9.1 Parameter Setting
  - 9.1.1 Basic parameter setting
  - 9.1.2 Automatic communication parameter setting
  - 9.1.3 MODBUS device assignment parameter setting
- 9.2 Program Example for Normal System Configuration
  - 9.2.1 System configuration and program conditions
  - 9.2.2 Program using utility package
  - 9.2.3 Program without using utility package
- 9.3 Program Example for Use in MELSECNET/H Remote I/O Network
  - 9.3.1 System configuration and program conditions
  - 9.3.2 Program using utility package
  - 9.3.3 Program without using utility package
10 DEDICATED INSTRUCTIONS
- 10.1 Dedicated Instruction List and Available Devices
- 10.2 Z(P).MBRW
- 10.3 Z(P).MBREQ
11 TROUBLESHOOTING
- 11.1 Troubleshooting
- 11.2 Confirming QJ71MT91 Status
- 11.3 Error Codes
  - 11.3.1 Error code storage areas
  - 11.3.2 Exception code list
  - 11.3.3 Error code list
- 11.4 Turning Off the COM. ERR. LED
  - 11.4.1 From GX Configurator-MB
  - 11.4.2 Program example for use of sequence program
- 11.5 Conducting PING Test to Check QJ71MT91 Connection
  - 11.5.1 From GX Configurator-MB
  - 11.5.2 Program example for use of sequence program
APPENDICES
- Appendix 1 External Dimensions
- Appendix 2 Function Upgrade of the QJ71MT91
- Appendix 3 Processing Time
- Appendix 4 GX Developer Connection Setup Example
INDEX
WARRANTY

Mitsubishi Electric MELSEC Q QJ71MT91 User's Manual

Mitsubishi Electric MELSEC Q QJ71MT91 manual cover

Pages 300

Year 0

Language(s)

of 300

Mitsubishi Electric MELSEC Q QJ71MT91 Specification

The Mitsubishi Electric MELSEC Q Series QJ71MT91 module is a robust and versatile communication interface designed to enhance the connectivity and data management capabilities of industrial automation systems. This module is specifically engineered for seamless integration into the MELSEC Q Series programmable logic controllers (PLCs), providing a reliable platform for Modbus TCP/IP network communication. It features a compact design that fits neatly within the Q Series PLC rack, optimizing space and efficiency.

The QJ71MT91 module supports high-speed data exchange and is equipped with dual Ethernet ports, allowing for flexible network configurations, including daisy-chaining and ring topologies. This enhances network reliability and helps in reducing downtime by ensuring continuous communication even if one path fails. The module supports Modbus TCP/IP protocol, enabling easy connectivity with a wide range of Modbus-compatible devices, facilitating interoperability and data exchange across different system components.

It offers comprehensive diagnostic and monitoring capabilities, enabling real-time status checks and troubleshooting to ensure consistent performance. The module's advanced security features safeguard data integrity and prevent unauthorized access, essential for maintaining secure and stable industrial operations. Additionally, the QJ71MT91 is designed for easy configuration and maintenance, featuring user-friendly setup tools and intuitive interfaces. This ensures a smooth integration process, reducing setup times and enhancing productivity.

Overall, the Mitsubishi Electric MELSEC Q QJ71MT91 is an essential component for modern industrial systems requiring reliable and efficient communication solutions. Its robust features and compatibility with various network configurations make it a valuable addition to any automation setup, ensuring optimal performance and scalability for future expansions.

Mitsubishi Electric MELSEC Q QJ71MT91 F.A.Q.

How do I initialize the QJ71MT91 module for the first time?

To initialize the QJ71MT91 module, you need to configure the network parameters using the GX Works2 software. Connect the module to your PC, open the software, and navigate to the network parameter setting. Assign the appropriate IP address, subnet mask, and other necessary settings before applying the configuration.

What steps should I follow to troubleshoot communication issues with the QJ71MT91 module?

First, check all physical connections and ensure the module is securely connected. Verify that the network settings, such as IP address and subnet mask, are correctly configured. Use the diagnostic tools in GX Works2 to check for network errors and review the error log for any specific messages. If issues persist, consult the module's manual for further troubleshooting steps.

Can the QJ71MT91 module be used in a CC-Link IE Field network?

Yes, the QJ71MT91 module supports CC-Link IE Field networks. You need to ensure that the network settings are compatible and configure the module accordingly through the GX Works2 software.

How do I perform a firmware update on the QJ71MT91 module?

To perform a firmware update, download the latest firmware version from the Mitsubishi Electric website. Connect your module to the PC and use the firmware update tool provided in the GX Works2 software to upload the new firmware onto the module. Follow the on-screen instructions to complete the update process.

What maintenance practices should be followed for the QJ71MT91 module?

Regularly inspect the module for any signs of physical damage or loose connections. Ensure that the module is operating in a clean, dust-free environment with sufficient ventilation. Periodically check the firmware and software for updates to maintain optimal performance and security.

How can I reset the QJ71MT91 module to its factory settings?

To reset the QJ71MT91 module to its factory settings, you will need to access the module through the GX Works2 software. Navigate to the 'Module Configuration' settings and select the option to restore factory defaults. Confirm the action and wait for the process to complete.

What is the maximum data transfer rate supported by the QJ71MT91 module?

The QJ71MT91 module supports a maximum data transfer rate of 1 Gbps when used in a compatible network configuration. This allows for fast and efficient data communication within industrial networks.

How do I configure the QJ71MT91 module for remote monitoring?

To configure the QJ71MT91 module for remote monitoring, set up the network parameters to allow access from external networks. Use the GX Works2 software to enable remote access features and configure the necessary security settings to protect the module from unauthorized access.

Can I use the QJ71MT91 module with other Mitsubishi PLC models?

Yes, the QJ71MT91 module is compatible with various Mitsubishi PLC models, as long as they are part of the MELSEC Q series. Ensure that the PLC firmware is up-to-date and that network configurations are properly set to enable seamless communication.

What should I do if the QJ71MT91 module is not recognized by the GX Works2 software?

If the module is not recognized, first check all physical connections and ensure that the module is powered on. Verify that the correct drivers are installed on your PC. Restart the software and try reconnecting. If the problem persists, consider reinstalling the GX Works2 software or contacting Mitsubishi support for further assistance.