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QJ71MB91

The Mitsubishi QJ71MB91 is a high-performance communication interface module designed for the MELSEC-Q Series PLC, enabling seamless integration with Modbus (RTU/ASCII) networks. This module allows Mitsubishi PLCs to act as Modbus master or slave devices, facilitating data exchange with sensors, drives, and other Modbus-compatible equipment in industrial automation systems.

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Key Specifications
Communication Protocol: Modbus RTU/ASCII (supports master/slave modes)

Interface: RS-485 (2-wire/4-wire)

Baud Rate: 300 to 115,200 bps (configurable)

Data Format: Adjustable (parity, stop bits, data length)

Max. Stations: 32 devices (RS-485 network)

Isolation: Photocoupler isolation for noise immunity

Mounting: Direct installation on Q Series base unit

Operating Temperature: 0°C to 55°C

Power Consumption: 5V DC, 0.35A (from PLC backplane)

Main Features
✔ Dual-Mode Operation – Functions as Modbus master (polling) or slave (responding)
✔ Easy Configuration – Set parameters via GX Works2/3 software
✔ High-Speed Data Exchange – Optimized for real-time industrial communication
✔ Diagnostic LEDs – Visual indicators for RUN, ERR, SD, RD status
✔ Compatibility – Works with Q00/Q01/Q02/Q06/Q12/Q13/Q26 CPUs
✔ Flexible Wiring – Supports terminal block or RJ45 connector (with adapter)

Typical Applications
Integration with Modbus RTU devices (sensors, meters, inverters)

SCADA and HMI communication

Energy monitoring systems

HVAC and building automation

Legacy equipment modernization