The 1757-SRM is an PLC ProcessLogix and ControlLogix module that is used for implementing controller redundancy to increase a process system availability. This is done by employing a secondary controller synchronized with a primary controller installed on Two (2) different ControlLogix chassis.
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.
