當(dāng)一個系統(tǒng)出現(xiàn)故障的時候，設(shè)計中應(yīng)當(dāng)有一一個可以接受的“故障-安全”保護，以使故障不會引起如條件失控或緊急停止失效等不安全情況的出現(xiàn)，急停和別的安全回路應(yīng)當(dāng)采用硬線連接以增強可靠性。例如，在一個主控繼電器(MCR)電路中，使用連續(xù)接線

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