Contents

SAFETY PRECAUTIONS
CONDITIONS OF USE FOR THE PRODUCT
REVISIONS
INTRODUCTION
CONTENTS
COMPLIANCE WITH THE EMC AND LOW VOLTAGE DIRECTIVES
GENERIC TERMS AND ABBREVIATIONS
DEFINITIONS OF TERMINOLOGY
PACKING LIST
1 OVERVIEW
- 1.1 Features
2 SYSTEM CONFIGURATION
- 2.1 Overall Configuration
- 2.2 Applicable Systems
- 2.3 How to Check the Function Version and Serial Number
- 2.4 Precautions on System Configuration
3 SPECIFICATIONS
- 3.1 Performance Specifications
  - 3.1.1 Maximum trunk line distance when using thick and thin cables
- 3.2 Function Lists
- 3.3 I/O Signals for Programmable Controller CPU
  - 3.3.1 I/O signal list
  - 3.3.2 I/O signals for the master function
  - 3.3.3 I/O signals for the slave function
- 3.4 Buffer Memory
  - 3.4.1 Buffer memory list
  - 3.4.2 Message communication area for master function
  - 3.4.3 Own node status area for master function
  - 3.4.4 Node status area for master function
  - 3.4.5 Master function parameter setting area
  - 3.4.6 Communication data area for master function
  - 3.4.7 Link scan time area for master function
  - 3.4.8 Own node status area for slave function
  - 3.4.9 Parameter setting area for slave function
  - 3.4.10 Communication data area for slave function
  - 3.4.11 Own node information area
  - 3.4.12 Hardware test area
  - 3.4.13 Parameter saving area selection area
  - 3.4.14 Auto communication start setting area
  - 3.4.15 Operation Setting Area for Bus Off Error
  - 3.4.16 Data consistency dedicated instruction area
- 3.5 Communication Performance
  - 3.5.1 Link scan time
  - 3.5.2 Communication cycle time
  - 3.5.3 Transmission delay
4 FUNCTIONS
- 4.1 Master Function (I/O Communication Function)
- 4.2 Master Function (Message Communication Function)
- 4.3 Slave Function (I/O Communication Function)
5 SETUP AND PREPARATION
- 5.1 Pre-operation Procedures
  - 5.1.1 When using the master function
  - 5.1.2 When using the slave function
  - 5.1.3 When using both the master and slave functions
- 5.2 Implementation and Installation
  - 5.2.1 Handling precautions
  - 5.2.2 Installation environment
- 5.3 Part Names and Settings
  - 5.3.1 LED indications
  - 5.3.2 Node number switches
  - 5.3.3 Mode switch
- 5.4 Hardware Test
- 5.5 Wiring
- 5.6 Communication Test
- 5.7 Precautions for Network Power Supply
  - 5.7.1 Network power supply unit position
  - 5.7.2 Network power supply unit position and current capacity calculation
6 FUNCTIONS FOR DeviceNet OF GX Works2
- 6.1 Functions for DeviceNet of GX Works2
- 6.2 Handling precautions
7 PROGRAMMING FOR EXECUTING THE MASTER FUNCTION
- 7.1 Programming Precautions
- 7.2 System Configuration
- 7.3 Parameters for Master Function
  - 7.3.1 Program example using the functions for DeviceNet of GX Works2
  - 7.3.2 Program example not using the functions for DeviceNet of GX Works2
- 7.4 I/O Communication Function
  - 7.4.1 Program example using the functions for DeviceNet of GX Works2
  - 7.4.2 Program example not using the functions for DeviceNet of GX Works2
- 7.5 Message Communication Function
  - 7.5.1 Example of reading message communication data
  - 7.5.2 Example of writing message communication data
- 7.6 Obtaining Error Information
- 7.7 Allocating Transmit/Receive Data Storage Devices for Future Expansion
8 PROGRAMMING FOR EXECUTING THE SLAVE FUNCTION
- 8.1 System Configuration
- 8.2 Parameters for Slave Function
  - 8.2.1 Program example using the functions for DeviceNet of GX Works2
  - 8.2.2 Program example not using the functions for DeviceNet of GX Works2
- 8.3 I/O Communication Function
  - 8.3.1 Program example using the functions for DeviceNet of GX Works2
  - 8.3.2 Program example not using the functions for DeviceNet of GX Works2
- 8.4 Obtaining Error Information
9 DEDICATED INSTRUCTIONS
- 9.1 Precautions
- 9.2 G.DNTMRD
- 9.3 G.DNTMWR
- 9.4 G.DNTSRD
- 9.5 G.DNTSWR
10 TROUBLESHOOTING
- 10.1 Problem Identification
  - 10.1.1 Checking the LEDs
  - 10.1.2 When unable to communicate with all slave nodes (when using master function)
  - 10.1.3 When unable to communicate with a specific slave node (when using master function)
  - 10.1.4 When unable to communicate with master node (when using slave function)
  - 10.1.5 Troubleshooting for other cases
- 10.2 Error Codes
  - 10.2.1 Communication error codes
  - 10.2.2 Execution error codes of message communication (for the master function only)
  - 10.2.3 General DeviceNet error codes of message communication (for the master function only)
  - 10.2.4 Error codes that can be detected by GX Works2
- 10.3 Checking the QJ71DN91 Status by system monitor in GX Works2
APPENDIXES
- Appendix 1 External Dimensions
- Appendix 2 How to Use the QJ71DN91 in System of MELSEC iQ-R Series
- Appendix 3 Parameter Setting Sheet (For the Master Function)
- Appendix 4 Parameter Setting Sheet (For the Slave Function)
- Appendix 5 List of Communication Parameters of Slave Nodes from Various Manufactures
- Appendix 6 EDS File of the QJ71DN91
INDEX
WARRANTY

Mitsubishi Electric MELSEC Q QJ71DN91 User's Manual

Mitsubishi Electric MELSEC Q QJ71DN91 manual cover

Pages 190

Year 0

Language(s)

of 190

Mitsubishi Electric MELSEC Q QJ71DN91 Specification

The Mitsubishi Electric MELSEC Q QJ71DN91 is a sophisticated communication module designed for seamless integration within the MELSEC Q Series PLC systems, facilitating efficient DeviceNet network communication. Engineered to meet the demands of industrial automation applications, the QJ71DN91 module supports DeviceNet protocol, offering robust connectivity for various intelligent devices such as sensors, actuators, and other network-enabled equipment. The module operates with a maximum communication speed of 500 kbps, ensuring rapid data exchange and reduced latency in high-speed industrial processes. It supports up to 64 slave devices, allowing extensive network scalability and device management. The module features a 5-pin open-style connector for easy connection to the DeviceNet network, promoting straightforward installation and maintenance. With a compact design, the QJ71DN91 integrates seamlessly into the MELSEC Q Series rack, optimizing space without compromising performance. It employs a powerful error detection mechanism to enhance network reliability by identifying and correcting data transmission errors. The QJ71DN91 supports both cyclic and transient communications, providing flexibility in data handling and device interaction. It is equipped with diagnostic functions, accessible through its intuitive interface, to monitor network status and troubleshoot issues efficiently. The module's compatibility with GX Developer and GX Works2 programming software allows for user-friendly configuration and system integration. Operating within a temperature range of 0 to 55 degrees Celsius, the QJ71DN91 is built to withstand challenging industrial environments. The device features LED indicators for status monitoring, offering visual confirmation of network and module conditions. Overall, the Mitsubishi Electric MELSEC Q QJ71DN91 is a reliable and versatile communication solution for complex industrial networks, ensuring consistent performance and operational excellence in automation systems.

Mitsubishi Electric MELSEC Q QJ71DN91 F.A.Q.

How do I connect the QJ71DN91 module to a DeviceNet network?

To connect the QJ71DN91 module to a DeviceNet network, ensure the module is properly installed in the MELSEC Q series rack. Connect the DeviceNet cable to the module's communication port and configure the network parameters using GX Works2 or GX Developer software. Ensure that the module's node address and baud rate are set correctly to match the network settings.

What are the steps to troubleshoot communication errors on the QJ71DN91 module?

First, check the LED indicators on the QJ71DN91 module for error codes. Verify the physical connections and ensure the DeviceNet cable is intact. Use the diagnostic tools in GX Works2 to check communication settings such as baud rate and node address. If errors persist, consult the manual for specific error codes and recommended actions.

How can I update the firmware on the QJ71DN91 module?

To update the firmware, download the latest firmware version from Mitsubishi Electric's official website. Connect your PC to the module using a USB or Ethernet cable and launch the firmware update utility provided by Mitsubishi. Follow the on-screen instructions to complete the update process. Ensure that the power supply is stable during the update to prevent data corruption.

What maintenance procedures are recommended for the QJ71DN91 module?

Regularly inspect the QJ71DN91 module for dust and debris, and clean it using a soft, dry cloth. Check all cable connections for signs of wear or damage. Update the firmware periodically to ensure optimal performance. Also, review the module's error logs to identify and address potential issues early.

Can the QJ71DN91 module operate in high-temperature environments?

The QJ71DN91 module is designed to operate within a specific temperature range, typically 0°C to 55°C (32°F to 131°F). Operating the module outside these temperatures can lead to malfunction or damage. Ensure proper ventilation and consider using additional cooling solutions if installed in a high-temperature environment.

How do I configure the QJ71DN91 module using GX Works2?

Open GX Works2 and create a new project. Navigate to the network configuration tool and select the QJ71DN91 module from the device list. Set the necessary communication parameters such as baud rate, node address, and I/O allocation. Apply the changes and download the configuration to the module to activate the settings.

What should I do if the QJ71DN91 module does not power on?

Check the power supply connection to ensure it is securely connected and supplying the correct voltage. Inspect the module for any visible damage or burnt components. Verify that the power supply unit is functioning correctly. If the module still does not power on, consider replacing it or consulting with a Mitsubishi Electric service technician.

How can I reset the QJ71DN91 module to factory settings?

To reset the QJ71DN91 module to factory settings, power off the module and locate the reset switch on the unit. Press and hold the reset switch while powering the module back on. Hold the switch for a few seconds until the module's indicators signify a reset. Release the switch and reconfigure the module as needed.

What are the LED indicators on the QJ71DN91 module used for?

The LED indicators on the QJ71DN91 module provide status information about its operation. Common indicators include power (PWR), network status (NS), and module status (MS). These LEDs help diagnose issues such as network connectivity problems or hardware malfunctions by displaying various error codes.

Is it possible to expand the I/O capacity of the QJ71DN91 module?

Yes, the I/O capacity of the QJ71DN91 module can be expanded by connecting additional I/O modules to the MELSEC Q series base rack. Ensure that the additional modules are compatible and configure them using GX Works2 to integrate them into the existing system.