Safety design standards for digital-type instruments and solenoid valves/relays in interlocking systems
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Hello everyone: In interlocking systems, it is generally assumed that under normal conditions: 1. The digital switches used as inputs should be in the closed state； 2. The coil of the solenoid/relay should be energized. May I ask which standards have provided relevant descriptions on this? Thank you
There is a statement in the SIS system design specifications that requires a fail-safe design; understand it based on this statement!