Is there any SIS system in which all DI points are isolated using relays (or isolators)?
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Is there any SIS system in which all DI points are isolated using relays (or isolators)? It seems that the DI cards in the SIS system often report errors due to on-site issues.
Generally, only the DI signals from electrical systems require relay isolation； The intrinsically safe DI signals from the field require an isolated safety barrier. I don’t know which SIS you use? It seems like this is the first time I’ve heard of such a fault phenomenon as you described.
DI is connected to the card directly through insurance terminals; since there is no isolation safety barrier, is it necessary to install one? The site might experience a ground short circuit at times