24 V supply (I/O) / functional ground 500 V AC 50 Hz 1 min
5 V supply, incoming remote bus/7.5 V supply (bus logics) 500 V AC 50 Hz 1 min
5 V supply, outgoing remote bus/7.5 V supply (bus logics) 500 V AC 50 Hz 1 min
7.5 V supply (bus logics)/24 V supply (I/O) 500 V AC 50 Hz 1 min