- Synchronizes a matched pair of redundant control chassis
- Supports ProcessLogix and ControlLogix redundancy systems
- Uses a dedicated multimode fiber link between redundancy modules
1757-SRM is an Allen-Bradley system redundancy module designed for paired ProcessLogix and ControlLogix chassis.
The module exchanges synchronization data with its partner, manages primary and secondary redundancy states, and provides relay contacts for external system-status indication.
Before installation or replacement, verify module series, qualified firmware, identical chassis contents, fiber cable, relay wiring, grounding, and the saved redundancy configuration.
Availability, condition, price, and shipping time for 1757-SRM are confirmed during quotation.
Allen-Bradley 1757-SRM ProcessLogix and ControlLogix System Redundancy Module Manuals, Datasheets, Links
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
- One module is installed in each chassis of the redundant pair
- The chassis powered first assumes the primary role during startup
- Both modules and controllers must qualify before redundant operation
- The redundancy link uses SC optical connectors
- The specified cable is 62.5/125 µm multimode fiber
- One transmit and one receive channel operate at 1300 nm
- Series B provides normally open, normally closed, and common relay terminals
- The relay circuit uses an external 11 to 30 V DC supply
- Shielding and grounding must follow the official wiring diagram
- ProcessLogix redundant controller systems
- ControlLogix redundant controller systems
- High-availability control systems using synchronized primary and secondary chassis