Description:

The Mitsubishi QJ71DN91 DeviceNet module is used in industrial automation systems to provide DeviceNet communication capability between a Mitsubishi PLC and DeviceNet networks. It is commonly installed in MELSEC PLC racks and control cabinets to connect the controller to DeviceNet I/O, sensors, and drives. Maintenance teams and system integrators use this module for network integration, distributed I/O deployment, and replacement of legacy communication interfaces.

Applications:

The Mitsubishi QJ71DN91 module is widely used in factory and process automation environments that require DeviceNet networking for control and monitoring. It is commonly found in packaging machinery, material handling systems, conveyor controls, robotics cells, and machine automation where distributed devices communicate via DeviceNet with a central PLC for deterministic I/O, status monitoring, and coordinated control.

Technical Specifications:

• Model: QJ71DN91
• Module type: DeviceNet communication interface
• Supported protocol: DeviceNet (CIP)
• Baud rates: Typical DeviceNet speeds (125/250/500 kbps)
• Connector: 5‑pin DeviceNet network connector
• Network topology: Linear with drop and trunk
• Indicators: Link/activity and status LEDs
• Mounting: PLC rack slot mount
• Compatibility: Mitsubishi MELSEC PLC systems
• Communication functions: I/O scanning, explicit messaging, network node handling
• Power: Backplane supplied
• Designed for: DeviceNet network interfacing in automation

Common Replacements:

• Mitsubishi QJ71DN91H (enhanced variant)
• Mitsubishi QJ71DN92 (alternate DeviceNet interface)
• Allen‑Bradley 1756‑DNB