Allen-Bradley 1756-RM2 Enhanced Redundancy Module for ControlLogix

Overview

The Allen-Bradley 1756-RM2 is a ControlLogix Redundancy Enhanced Module engineered to provide reliable system redundancy and continuous operation. It supports multiple chassis configurations and is compatible with standard and redundant power supplies, ensuring high system availability.

Technical Specifications

• Manufacturer Allen-Bradley (Rockwell Automation)

• Series ControlLogix

• Model / Part Number 1756-RM2

• Product Type Redundancy Enhanced Module

• Weight 0.3 kg

• Current Draw 1.16 A @ 5.1 V DC; 3.4 mA @ 24 V DC

• Power Dissipation Maximum 6 W

• Thermal Dissipation 21 BTU/hr

• Connector Cables 1756-RMC1 (1 m), 1756-RMC3 (3 m), 1756-RMC10 (10 m)

• Slot Width 1 slot

• Module Location Any chassis slot

• Compatible Chassis 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17

• Standard Power Supplies 1756-PA72, 1756-PA75, 1756-PB72, 1756-PB75

• Redundant Power Supplies 1756-PA75R, 1756-PB75R, 1756-PSCA2

• Enclosure Type Open-style (no enclosure)

• Temperature Rating T4 per North American & IEC standards

Key Features

• Enhanced redundancy for ControlLogix systems, minimizing downtime

• Supports standard and redundant power supply configurations

• Compatible with multiple chassis sizes and slots for flexible installation

• Low power consumption and thermal dissipation for efficient operation

• Connector cable options available for different chassis distances

Application Scenarios

The 1756-RM2 is ideal for:

• Redundant ControlLogix PLC systems in critical applications

• High-availability machinery and process control

• Systems requiring continuous operation during power supply or module failures

Similar Models Comparison

• 1756-RM2 – Redundancy enhanced module, supports multiple chassis and power configurations

• 1756-RM1 – Earlier generation redundancy module with fewer chassis compatibility

• 1756-RM3 – Advanced redundancy with extended diagnostics and communication options

FAQs

Q: Which chassis are compatible with this module?
A: The 1756-RM2 works with 1756-A4, A7, A10, A13, and A17 ControlLogix chassis.

Q: Can it use both standard and redundant power supplies?
A: Yes, it supports standard 1756-PA72/75 and PB72/75, as well as redundant 1756-PA75R, PB75R, PSCA2 power supplies.

Q: How much power does it dissipate?
A: Maximum power dissipation is 6 W, with thermal dissipation of 21 BTU/hr.