MPP SC300E-MPP | ABB Triple Modular Redundant safety controller

A single system may be as small as one chassis or as large as 15, giving amaximum of 9,500 I/O. The system is designed to achieve the highest possible reliability, safety and availability and still provide economicadvantage. System availabilities in excess of 99.999% can readily be Realised, maximising the potential uptime for a customers process plant. All SC300E input and output modules interface to three isolated I/O communication buses, each being controlled by one of the threeprocessor modules. Field input signals are filtered and split, via isolating circuits on the input modules, into three identical signal processing paths. Each path is controlled by a micro-controller to coordinate processing, testing and status reporting to the respective processor. Each processor communicates with its two neighbours via isolated, read only, high speed links to synchronise input, output and diagnostic status information at least once every scan.