Allen Bradley 1757-SRC3 ProcessLogix and ControlLogix System Redundancy Module

 The Allen-Bradley 1757-SRM is a ProcessLogix and ControlLogix System Redundancy Module. This module enables Controller Redundancy by pairing with another 1756-SRM from another ControlLogix chassis. This module is a Two (2) slot module with integrated Fiber Optic port compatible for 62.5/125 micron multi-mode fiber-optic cable with SC connector.

The 1757-SRM features a Fiber Optic port where a 62.5/125-micron multi-mode fiber-optic cable with SC connector is connected. The other end of the cable connects to the partner 1757-SRM installed on the other ControlLogix chassis. This cable serves as the synchronization link of the modules and the entire secondary rack.

The 1757-SRM is a Two (2) slot module. It has module status display that indicates text codes that represent the module operational status. The PRI LED inform the user which of the chassis within the pair operates as the primary chassis. The COM LED represents the communication and synchronization status. The Health status LED indicates if the module is performing self-test, experienced critical failure or operating normally.

The 1757-SRM is compatible with ControlLogix chassis 1756-A4, 1756-A7, 1756-A10, 1756-A13, or 1756-A17 and System Power Supplies 1756-PA72, 1756-PA75, 1756-PB72, or 1756-PB75. For 1756-A4, recommended installation slot is 1 or 2; 1756-A7 is slot 4 or 5; 1756-A10 is slot 5 or 6; 1756-A13 is slot 4 or 5 and 1756-A17 is slot 5 or 6.

The Allen-Bradley 1757-SRM ProcessLogix and ControlLogix System Redundancy Module is a solid-state device that is employed in critical industrial applications that should not be stopped under any circumstances in order to provide a redundancy system by using an identical pair of PLCs to guarantee operation at all times. The 1757-SRM redundancy module is designed for installation in any free slot of a ControlLogix chassis but predefining the order of the cards to install in each ControlLogix slot is recommended. Both PLC systems, called the primary and secondary PLC systems, should be identical for the redundancy system to work appropriately.