Allen-Bradley 1756-RM Redundancy Module

Feature & Principle

It is a dedicated redundancy management module for Rockwell ControlLogix platform. A pair of 1756-RM modules are installed in two separate racks, connected by dedicated fiber cable. It continuously synchronizes program, tag data and chassis status between primary and standby controllers. When the main controller fails, it triggers bumpless switchover to the standby controller to keep the control system running. It monitors redundancy link health, provides fault diagnosis and status indication, configured by Studio 5000 / RSLogix5000 software. This model is widely used for critical process control that requires zero downtime.

Specifications

Model: 1756-RM Brand: Allen-Bradley (Rockwell Automation) Series: ControlLogix Function: Controller redundancy synchronization, hot backup failover Sync link: Fiber optic cable 1756-RMC1/RMC3/RMC4 Transfer rate: 100 Mbps Backplane: 1756 series chassis Operating temperature: 0 ~ 60℃ Status indicator: PRI, COM, OK LED Mounting: Chassis slot installation Application: Petrochemical, power plant, water treatment high-reliability control cabinet Certification: CE, UL

Components & Diagnostics

Main control PCB, fiber transceiver circuit, backplane interface, status LED, watchdog circuit. Common faults: fiber link interruption, sync mismatch, module handshake failure, power abnormality, switchover failure.

Product Brief

1756-RM redundancy module, Allen-Bradley ControlLogix hot backup synchronization spare widely used for high availability PLC cabinet overhaul and replacement.