This is part of the control system of a machine that prevents a hazardous condition from occurring. It can be a separate dedicated system or it may be integrated with the ordinary machine control system.
The complexity of a safety related control system (SRCS) may vary from a simple system such as a guard door interlock switch and emergency stop switch connected in series to the control coil of the power contactor, to a compound system comprising both simple and complex devices communicating through software and hardware.
Safety related control systems are usually designed to perform safety functions. The safety related control system must continue to operate correctly under all foreseeable conditions.
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