Allen-Bradley 1756-RM Redundancy Module | ControlLogix System

Allen-Bradley 1756-RM ControlLogix Redundancy Module

The Allen-Bradley 1756-RM is an enhanced redundancy module for the ControlLogix platform. 

Core Specifications & Function

• Brand & Manufacturer: Allen-Bradley / Rockwell Automation
• Model & Series: 1756-RM (ControlLogix Redundancy Module)
• Primary Function: Enables redundancy for two ControlLogix controllers (1756-L61, L62, L63, or one L64).
• Sync Connection: One (1) LC single-mode fiber optic port for high-speed synchronization.
• Status Indicators: PRI, COM, and OK LEDs for immediate module and system health monitoring.
• Power Consumption: 1.2A @ 5.1VDC, 120mA @ 24VDC, 4mA @ 1.2VDC.
• Power Dissipation: 9 Watts (31 BTU per hour).
• Module Weight: 0.29 kg (0.64 lbs).

Environmental Ratings & Compatibility

• Operating Temperature: 0°C to 60°C (32°F to 140°F).
• Storage Temperature: -40°C to 85°C (-40°F to 185°F).
• IEC Temperature Code: T4 rated for safe use in industrial environments.
• Chassis Compatibility: Fits any slot in 1756-A4, A7, A10, A13, or A17 chassis.
• Controller Support: Manages redundancy for two 1756-L61, L62, L63 controllers or one 1756-L64.
• Power Supply Compatibility: Works with standard (1756-PA72/PB75) and redundant (1756-PA75R/PB75R) supplies.
• Certifications: CSA, CE, c-UL-us, FM, KC, Ex, and C-Tick for global market use.

Installation & Configuration Guide

• Install the 1756-RM module in any available slot of both primary and secondary chassis.
• Critical Requirement: Both chassis must have identical hardware and software configurations.
• Connect the primary and secondary 1756-RM modules using the required 1756-RMCx series fiber optic cable.
• Use the dedicated Redundancy Configuration Tool within the Rockwell software suite for setup.
• Configure overall module parameters and redundancy behavior in Studio 5000 Logix Designer.
• For optimal performance, use modules of the same series (A or B) in the redundant pair.
• The module's LEDs provide real-time status: PRI (Primary), COM (Communicating), OK (Module Healthy).

Package & Shipping Information

• One (1) Allen-Bradley 1756-RM ControlLogix Redundancy Module.
• This product ships as a single module. Cables and chassis are sold separately.
• The necessary fiber optic sync cable (1756-RMCx) must be purchased separately for system setup.
• We ensure secure global delivery via trusted carriers: FedEx, UPS, and DHL.

Frequently Asked Questions (FAQ)

What controllers can I use with the 1756-RM module?

• The 1756-RM module supports redundancy for two 1756-L61, L62, or L63 controllers. It also supports a single, more powerful 1756-L64 controller in a redundant setup.

Do I need a special cable to connect two redundancy modules?

• Yes, you must use the official 1756-RMCx series fiber optic cable. This cable connects the primary and secondary modules to synchronize data and control states.

Can I mix Series A and Series B 1756-RM modules in one system?

• While possible, it is not recommended. For maximum performance and reliability, Rockwell advises using two modules of the same series (both A or both B) in your redundant pair configuration.