Mitsubishi Electric RJ71BAC96 MELSEC iQ-R BACnet Communication Module Product Description

Overview

Mitsubishi Electric RJ71BAC96 is a BACnet IP communication module for the MELSEC iQ-R series PLC, co-developed by Mitsubishi Electric and Unitec. This Mitsubishi Electric RJ71BAC96 connects the iQ-R controller to BACnet building automation networks, enabling data exchange between Mitsubishi PLC and HVAC, chiller, VAV, building management BMS controllers. It is widely used for factory HVAC skids, cleanroom automation, building energy monitoring and industrial BMS integration, for new control cabinet build, retrofit and spare‑part replacement of Mitsubishi iQ-R BACnet modules.

Features

Mitsubishi Electric RJ71BAC96 supports BACnet/IP protocol over Ethernet, compatible with IPv4 and IPv6. This Mitsubishi Electric RJ71BAC96 supports COV (Change of Value) notification, object read/write, event notification and alarm transmission for BACnet standard objects. RJ71BAC96 maps PLC internal devices to BACnet objects, supporting separate read, write, monitoring and COV access block configuration. It has one 10/100 Mbps RJ45 Ethernet port, auto MDI/MDIX, full/half duplex selectable. Module LEDs indicate RUN, ERR, INIT, OPE, ALM, SD and RD status for quick fault diagnosis. It works with GX Works3 for module parameter assignment, object mapping and firmware update, and supports BACnet standard service for interlocking with third-party BMS systems. It complies with CE, UKCA certifications.

Specs

• Brand: Mitsubishi Electric

• Series: MELSEC iQ-R

• Model: RJ71BAC96

• Type: BACnet/IP communication module

• Interface: 1 × RJ45 Ethernet

• Speed: 10 / 100 Mbps

• Protocol: BACnet/IP, IPv4 / IPv6

• Max cable length: 100 m between switch and module

• Power consumption: 0.61 A (5 V DC backplane)

• Dimensions: 106 mm × 27.8 mm × 110 mm

• Weight: 0.19 kg

• Programming software: GX Works3

• Standard: CE, UKCA

Principle

Mitsubishi Electric RJ71BAC96 communicates with the iQ-R CPU via the iQ-R backplane bus. It converts PLC bit/word data into BACnet object data, publishes COV messages when values change, and receives setpoint commands from BMS. The module manages BACnet session, object database and message scheduling independently of the CPU scan. Communication errors and BACnet service failures are logged and reflected on the module alarm status and stored in the PLC fault buffer.

Applications

Mitsubishi Electric RJ71BAC96 is deployed in pharmaceutical cleanroom HVAC control skids, water treatment building BMS, data center auxiliary cooling systems, packaging factory air handling units and commercial building automation. This Mitsubishi Electric RJ71BAC96 module bridges the iQ-R control logic and BACnet building management platform. RJ71BAC96 fits automation cabinet overhaul and spare replacement of Mitsubishi iQ-R BACnet communication modules.

Installation & Maintenance Notes

Follow official Mitsubishi RJ71BAC96 startup manual during installation of Mitsubishi Electric RJ71BAC96. Power off the PLC rack before inserting or removing the module. Back up BACnet object mapping, COV settings and IP configuration before replacement. After replacement, verify backplane mounting, network IP plan and BACnet object read/write permissions. Confirm exact part number RJ71BAC96; it cannot be substituted with other iQ-R network modules such as RJ71EN71 or RJ71PB91V.