Product Overview
The Allen-Bradley 1756-RM is a ControlLogix Redundancy Module engineered for high-availability control systems. As part of the ControlLogix platform, this module enables seamless failover between two identical controllers, minimizing downtime in critical industrial processes. Designed for use with 1756-L61, -L62, -L63 controllers (or one 1756-L64) and up to seven communication modules, the 1756-RM ensures continuous operation in demanding applications.
This enhanced redundancy module features a single-mode LC fiber optic connector for high-speed synchronization and status LEDs (PRI, COM, OK) for at-a-glance system health monitoring. Whether upgrading an existing system or building a new redundant architecture, the 1756-RM delivers the reliability your operations demand.
Key Features & Benefits
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Seamless Redundancy: Supports two 1756-L61, -L62, -L63 controllers or one 1756-L64 controller, ensuring automatic failover.
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High-Speed Sync: Achieves 100 Mbps synchronization when paired with the same series module (Series A or B).
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Robust Design: Operating temperature range of 0 to 60 °C (32 to 140 °F) and storage from -40 to 85 °C (-40 to 185 °F).
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Easy Integration: Chassis-based mounting in any slot; compatible with 1756-A4, A7, A10, A13, A17 chassis.
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Comprehensive Certifications: CSA, CE, Ex, C-Tick, c-UL-us, FM, and KC for global acceptance.
Technical Specifications
| Parameter |
Value |
| Brand |
Allen-Bradley / Rockwell Automation |
| Series |
ControlLogix |
| Part Number |
1756-RM |
| Type |
Redundancy module |
| Current draw at 1.2 VDC |
4 mA |
| Current draw at 5.1 VDC |
1.2 A |
| Current draw at 24 VDC |
120 mA |
| Mounting |
Chassis-based, any slot |
| Power dissipation |
9 W |
| Thermal dissipation |
31 BTU/hr |
| Operating temperature |
0 to 60 °C (32 to 140 °F) |
| Storage temperature |
-40 to 85 °C (-40 to 185 °F) |
| IEC temperature code |
T4 |
| Certifications |
CSA, CE, Ex, C-Tick, c-UL-us, FM, KC |
| Weight |
0.29 kg (0.64 lb) |
Compatible Systems & Integration
The 1756-RM integrates seamlessly into ControlLogix systems. It is compatible with the following chassis and power supplies:
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Chassis: 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17
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Standard Power Supplies: 1756-PA72, 1756-PA75, 1756-PB72, 1756-PB75
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Redundant Power Supplies: 1756-PA75R, 1756-PB75R, 1756-PSCA2
For synchronization, the 1756-RM requires the 1756-RMCx redundancy cable. Configuration is performed using the redundancy configuration tool and Studio 5000 Logix Designer for full parameter setup.
Installation & Setup Guidance
Install the 1756-RM into any available slot in a compatible ControlLogix chassis. Ensure the redundant pair uses identical chassis configurations and the same series of redundancy module for optimal performance. Connect the fiber optic cable between the two modules to establish synchronization. Use the redundancy configuration tool to enable and monitor the redundant system.
Maintenance & Reliability
Regularly inspect the fiber optic connections and status LEDs to ensure proper operation. Keep the module within the specified temperature range to prevent overheating. The 1756-RM’s low power dissipation (9 W) and compact design contribute to long-term reliability, reducing downtime and maintenance costs.
Selection Guide & Purchasing Advice
Before purchasing, verify your controller model (1756-L61, -L62, -L63, or -L64) and confirm the chassis and power supply compatibility. Ensure you have the necessary 1756-RMCx cable and the correct series (A or B) to match your existing system. For expert assistance and genuine Allen-Bradley parts, trust PLC Source PRO as your reliable supplier.