This reference design also provides diagnostic coverage for detecting various faults which helps in increasing safe failure fraction.
This design uses ISO1212 as an isolated 24-V digital input receiver, compliant to IEC 61131-2 Type 1 characteristics to accept the two STO signals.
Unlike traditional optocoupler solutions with discrete components having imprecise current limiting circuitry, the ISO1212 devices provide a simple, low-power solution with accurate current limits and a longer lifespan.
The adjustable current-limit function of the load switch improves the reliability of the system. The ready pin of the gate driver, ISO5852S, helps in monitoring the supply rails.
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