1756-RM | Allen-Bradley ControlLogix System Redundancy Module

Overview

The Allen-Bradley 1756-RM is a ControlLogix redundancy module designed to provide seamless system switchover and increased operational reliability in mission-critical automation environments. It ensures continuous controller operation by synchronizing data between redundant ControlLogix chassis, minimizing downtime during primary system failure or maintenance.

Technical Specifications

• Manufacturer: Allen-Bradley

• Product Line: ControlLogix Series

• Model / Part Number: 1756-RM

• Product Type: Redundancy Module

• Weight: 1.13 lbs (0.51 kg)

• Mounting Type: Chassis-based, installable in any slot

• Current Draw:

• 1.2 V DC: 4 mA

• 5.1 V DC: 1.2 A

• 24 V DC: 120 mA

• Power Dissipation: 9 W

• Thermal Dissipation: 31 BTU/hr

• Operating Temperature: 0°C to 60°C (32°F to 140°F)

• Storage Temperature: -40°C to 85°C (-40°F to 185°F)

• Temperature Code: IEC T4

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

• Compatible Power Supplies:

• Standard: 1756-PA72, 1756-PA75, 1756-PB72, 1756-PB75

• Redundant: 1756-PA75R, 1756-PB75R, 1756-PSCA2

Key Features

• Enables full system redundancy for ControlLogix architectures

• Real-time synchronization between primary and secondary controllers

• Automatic system switchover without process interruption

• Chassis-based design allows flexible installation in any slot

• Compliant with global industrial safety and EMC standards

• Works with both standard and redundant power supplies

• Ideal for high-availability and fault-tolerant control systems

Application Scenarios

• Continuous process control systems

• Power generation and utility automation

• Oil & gas and refinery applications

• Pharmaceutical and food manufacturing lines

• High-availability control environments

FAQs

Q: What is the primary function of the 1756-RM module?
A: The 1756-RM provides system redundancy by allowing two ControlLogix controllers to operate in a synchronized, fault-tolerant configuration.

Q: Can the 1756-RM be installed in any slot?
A: Yes, it is chassis-based and can be installed in any available slot of a compatible ControlLogix chassis.

Q: What happens during a switchover?
A: The module automatically transfers control to the secondary system with minimal delay, ensuring uninterrupted operation.

Q: What power supplies are compatible with the 1756-RM?
A: It supports both standard and redundant power supplies, including models 1756-PA75R, 1756-PB75R, and 1756-PSCA2.