1757-SRM 1757SRM AB AB Sytem Redundancy Module

1757-SRM 1757SRM AB AB Sytem Redundancy Module

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Product Details

The AB 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. If the primary and secondary PLC systems are not exactly identical, or if the modules do not have matching firmware revisions, the 1757-SRM module will not be able to establish a redundancy system as required.

The AB 1757-SRM ProcessLogix and ControlLogix System Redundancy Modules installed in primary and secondary PLC chassis will need to be interconnected by using a 1757-SRCxx Fiber-optic Cable. The length of the cable can be 1 meter (3 feet), 3 meters (9 feet), 10 meters (30 feet), 50 meters (150 feet), or 100 meters (300 feet). Once both chassis are assembled and connected, it can be designated which one will be the primary chassis and which will be the secondary chassis. When power is applied to both chassis, the AB 1757-SRM ProcessLogix and ControlLogix System Redundancy Module will start the qualification process, that is, it will compare each PLC’s hardware and firmware characteristics and determine their full compatibility. If they are the same, then redundant control will be guaranteed and in case of a failure in the first PLC, the second one will take over the application process and signal an alarm to inform the final users of the event without stopping the critical process in the meantime.

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