Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1756-RM/B |
| Manufacturer | Allen‑Bradley (Rockwell Automation) |
| Product Type | ControlLogix Redundancy Module (Series B) |
| Redundancy Link Medium | Fiber optic (LC connector) |
| Synchronization Cable | 1756-RMC1 (1 m), RMC3 (3 m), RMC10 (10 m) |
| Backplane Current Draw | ~1.16 A @ 5.1V DC; ~120 mA @ 24V DC |
| Power Dissipation | ~9 W (~31 BTU/hr) |
| Switchover Time | Typically <100 ms (application‑dependent) |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Storage Temperature | -40 °C to 85 °C |
| Relative Humidity | 5% to 95% non‑condensing |
| Compatible Controllers | ControlLogix 5560, 5570, 5580 series (incl. GuardLogix) |
| Chassis Compatibility | 1756-A4, A7, A10, A13, A17 |
| Certifications | UL, CE, ATEX, IECEx, RCM, CCC |
Main Features and Advantages
Fast, automatic failover: The 1756‑RM/B is designed for minimal switchover time, ensuring that control transitions from the primary to secondary controller with minimal impact on the process. This sub‑second failover is critical for continuous processes where even brief interruptions can lead to significant production loss or safety events.Enhanced synchronization and diagnostics: Compared to earlier Series A modules, the Series B offers improved synchronization performance and diagnostic capabilities. It maintains a mirrored image of the controller state, including produced/consumed tags and CIP connections. Integrated status LEDs (PRI, COM, OK) and a 4‑character alphanumeric display provide immediate visual feedback on module health and redundancy status, simplifying troubleshooting.Robust, isolated communication: The use of fiber‑optic cables for the redundancy link provides complete electrical isolation between chassis, eliminating ground loop issues and providing high immunity to electromagnetic interference (EMI) in harsh industrial environments.
Application Field
The 1756‑RM/B is deployed in industries where system downtime is not an option. In oil & gas, it protects critical operations such as pipeline compressor control and offshore platform safety systems. For power generation, the module ensures uninterrupted control of turbines and grid substations. Water and wastewater treatment facilities use it to maintain continuous operation of filtration and pumping stations. In automotive and chemical manufacturing, it safeguards high‑value production lines and batch processes against controller hardware failures.
Related Products
- 1756‑L7x Controllers: ControlLogix processors (e.g., L71, L72, L75) that form the primary/secondary pair managed by the redundancy module.
- 1756‑RMC Series Cables: Fiber‑optic synchronization cables (1m, 3m, 10m lengths) required to connect the two 1756‑RM/B modules.
- 1756‑PA75R / PB75R: Redundant power supplies often used in conjunction with the redundancy module to create a fully fault‑tolerant system.
- 1756‑RM2 / RM2XT: Enhanced redundancy modules offering extended temperature ranges or additional features for more demanding environments.
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