Hi guys, about fail-safe technology/signals, for what i read it is force plant into safe state after shut-down. I work in paper industry, and for the press section of the paper machine there are some fail safe signals. Practically i know (correct me if i am wrong), that unlike standard signals, for fail-safe we double (physically) signals(the master or first signal and the same compared signal) and if one of them fail we have a fault. How this help to increase safety for the machine and the people , compare to standard (non fail-safe) signals. Thank you in advance
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