The IS420USCH1A Mark VIeS safety controller module is responsible for executing safety logic, monitoring input signals, and triggering safety actions (such as emergency stop). It also works in conjunction with the main controller (such as the Mark VIe) to separate safety and control functions. It supports dual-channel redundancy, with two independent channels operating simultaneously and providing mutual backup, improving system reliability.
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IS420USCH1A-F-V0.1-A Mark VIeS Safety Controller Module GE


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