Components of the SIS verification circuit
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Dear experts, regarding the calculation of the SIL level for SIS systems, what components and parameters are required for each circuit? For example, in the case of switch valves, is it necessary to take into account the valve body and actuator as well as fault parameters, or is it sufficient to consider only the solenoid valve?； Additionally, regarding the SIS interlocked start/stop of the motor, it is also necessary to consider whether intermediate relays are required, as well as whether safety relays or SimCode need to be taken into account in the calculations
It’s actually very simple; one can imagine the various equipment components that are involved in a interlock circuit’s operation, from detecting deviations in process parameters to ultimately bringing the system into a safe state.