Mitsubishi Electric QJ71DN91 DeviceNet Module

The Mitsubishi Electric QJ71DN91 DeviceNet Module is a DeviceNet communication interface for MELSEC PLC systems, enabling a Mitsubishi controller to communicate with DeviceNet I/O, sensors, and drives on industrial networks. It supports DeviceNet (CIP) at typical speeds of 125, 250, and 500 kbps and uses a 5-pin DeviceNet network connector for a compact, rack-slot mount interface. This module is backplane-powered, provides I/O scanning, explicit messaging, and network node handling to support distributed I/O deployment and efficient network integration, with front-panel indicators for link/activity and status. The linear topology with drop and trunk supports scalable DeviceNet layouts, making it suitable for factory and process automation environments such as packaging machinery, material handling systems, conveyors, robotics cells, and other machine automation where a MELSEC PLC coordinates with DeviceNet I/O. Common replacements include the QJ71DN91H (enhanced variant), QJ71DN92, and Allen-Bradley 1756-DNB.