Mitsubishi Electric

Mitsubishi Electric RJ71C24-R4 MELSEC iQ-R Serial Communication Module

SKU RJ71C24-R4

In stock
  • 12-month warranty
  • Free returns within 30 days

  • Manufacturer: Mitsubishi Electric

  • Product No.: RJ71C24-R4

  • Country of origin:United States

  • Product Type: Communication Modules

  • Payment: T/T, Western Union

  • Weight: 130g

  • Dimensions: 27.8 mm x 106 mm x 110 mm

  • Shipping port: Xiamen

  • Warranty: 12 months

Description

Designed for seamless integration within the MELSEC iQ-R Series programmable controller platform, the RJ71C24-R4 serial communication module provides dual-channel RS-422/RS-485 serial interfaces. This module enables direct data transmission between the PLC system and peripheral devices such as human-machine interfaces (HMIs), frequency inverters, temperature controllers, and barcode readers. By supporting standard protocols including MC protocol, Modbus/RTU, and non-procedural communications, the RJ71C24-R4 facilitates highly reliable serial networking in industrial environments without requiring complex transmission programs.

Features

  • Dual-channel configuration featuring two dedicated RS-422/RS-485 serial ports.
  • Direct installation onto the MELSEC iQ-R series main base unit.
  • Supports MC protocol, Modbus/RTU master/slave, and bidirectional non-procedural communication.
  • Simplifies programming through pre-defined protocol support and dedicated PLC instructions.
  • Provides robust diagnostics and monitoring capabilities through GX Works3 engineering software.

Applications

  • Factory automation and control systems.
  • SCADA and HMI monitoring network integration.
  • Distributed peripheral device control (Inverters, Sensors, and Actuators).
  • Legacy serial-to-PLC communication bridging.

Technical Specifications

Manufacturer Mitsubishi Electric
Part Number / Model RJ71C24-R4
Series MELSEC iQ-R
Module Type Serial Communication Module
Communication Interface 2 channels x RS-422/RS-485
Dimensions (W x H x D) 27.8 mm x 106 mm x 110 mm
Weight 0.13 kg

Connections and Interfaces

Channel Interface Type Supported Protocols
Channel 1 RS-422/RS-485 (2-wire or 4-wire connection) MC Protocol, Modbus/RTU, Non-procedural
Channel 2 RS-422/RS-485 (2-wire or 4-wire connection) MC Protocol, Modbus/RTU, Non-procedural

Installation Guidelines

  • Ensure the system base unit power supply is switched completely off before mounting or removing the module.
  • Secure the module firmly onto the MELSEC iQ-R base unit using the module fixing hook and secure locking mechanism.
  • Utilize shielded twisted-pair cables for all RS-422 and RS-485 connections to minimize electromagnetic interference (EMI).
  • Connect terminating resistors (typically 110 or 330 ohms) across SDA/RDA or RXD+/RXD- terminals depending on the network configuration.

FAQ

What is the primary function of the RJ71C24-R4 module?
The RJ71C24-R4 is a serial communication module designed for the MELSEC iQ-R PLC series, providing two RS-422/RS-485 ports to interface with serial peripherals and external systems.

Does this module support Modbus communication?
Yes, the RJ71C24-R4 supports Modbus/RTU protocols, allowing integration with Modbus master and slave networks.

What are the physical dimensions of the RJ71C24-R4?
The module has a width of 27.8 mm, a height of 106 mm, a depth of 110 mm, and weighs approximately 0.13 kg.

Can I install or remove this module while the PLC rack is powered?
No, always shut off all external power supplies before mounting, removing, or wiring any MELSEC iQ-R series module to prevent hardware damage.

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  • Standard Delivery: 4–6 business days via DHL, FedEx, and UPS.
  • Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
  • Worldwide Coverage: Serving over 150 countries.

Returns & Warranty

  • 30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
  • 12-Month Warranty: Every industrial component is backed by our technical warranty.
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Global Express Shipping

  • Standard Delivery: 4-6 Business Days via DHL, FedEx, and UPS.
  • Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
  • Worldwide Coverage: Serving over 150 countries, including rapid delivery to Saudi Arabia and UAE.

Returns & Warranty

  • 30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
  • 12-Month Warranty: Every industrial component is backed by our professional technical warranty.

Orders are processed and delivered Monday-Friday (excluding public holidays).


For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .

TECHNICAL SPECIFICATIONS

Country of origin
United States

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