AB Allen Bradley 1756-RM2K ControlLogix Redundancy Module

Product Summary

The Allen-Bradley 1756-RM2K is a ControlLogix Redundancy Module by Rockwell Automation, designed for high-availability control systems. It enables bumpless switchover between primary and secondary ControlLogix chassis pairs, ensuring continuous process control with zero data loss during controller failure or maintenance events. The -K suffix denotes a kit configuration including the redundancy module and associated fiber-optic communication cables.

Core Specifications

• Model Number: 1756-RM2K
• Type: ControlLogix Redundancy Module Kit
• Function: Synchronized redundancy communication between paired ControlLogix chassis
• Communication: Fiber-optic link via included cables
• Switchover Time: Bumpless (sub-scan, typically <10 ms)
• Compatibility: ControlLogix 5580, 5570, and selected 5560 controllers
• Manufacturer: Allen-Bradley by Rockwell Automation

Electrical & Functional Characteristics

• Backplane Current Draw: 1.2 A at 5.1 VDC
• Power Dissipation: 6.1 W typical
• Operating Voltage: 5.1 VDC (supplied from ControlLogix backplane)
• Status Indicators: Module status, synchronization status, and fiber link health LEDs
• Data Synchronization: Continuous cross-loading of controller data, I/O state, and program logic

System Integration & Compatibility

• Primary Platform: ControlLogix 5580 (1756-L8x), 5570 (1756-L7x), and 5560 (1756-L6x) controllers
• Chassis Requirement: 1756-A4, -A7, -A10, -A13, -A17 chassis in redundant pairs
• Slot Position: Dedicated redundancy slot (Slot 0 or designated RM slot) in each chassis
• Software Configuration: Studio 5000 Logix Designer v24 or later with Redundancy Module Configuration
• Related Parts: 1756-RM2 (module only), 1756-RMC1 (1m fiber cable), 1756-RMC10 (10m fiber cable)

Environmental & Operational Limits

• Operating Temperature: 0°C to 60°C (32°F to 140°F)
• Storage Temperature: -40°C to +85°C (-40°F to 185°F)
• Humidity: 5% to 95% RH, non-condensing
• Vibration: 2G, 10 to 500 Hz
• Shock: 30G, 11 ms

Industrial Applications

Widely deployed in oil & gas, petrochemical, power generation, water/wastewater, metals, mining, pharmaceuticals, food & beverage, and automotive manufacturing facilities requiring continuous process availability and zero-downtime control systems.

Frequently Asked Questions

What is the 1756-RM2K used for?

It is a redundancy module kit for ControlLogix systems, enabling automatic bumpless switchover between primary and secondary controllers to eliminate single points of failure.

What does the -K suffix mean?

The -K indicates a kit that includes the 1756-RM2 redundancy module plus fiber-optic communication cables. The standard 1756-RM2 is the module only.

Which controllers are compatible?

ControlLogix 5580 (1756-L8x), 5570 (1756-L7x), and selected 5560 (1756-L6x) controllers with firmware supporting redundancy.

What are the related part numbers?

• 1756-RM2 — Redundancy Module (module only)
• 1756-RM2K — Redundancy Module Kit with cables (this part)
• 1756-RMC1 — 1 meter fiber-optic cable
• 1756-RMC10 — 10 meter fiber-optic cable