急停按鈕開關(guān)和互鎖通常是常閉的，從而控制-個電力機(jī)械主控繼電器(參看下圖)，這個繼電器應(yīng)當(dāng)可以直接的使電機(jī)啟動和PLC輸出電路等失效，這類的電路在故障時“打開”，從而使設(shè)備失效，例如如果一根接線斷裂或者-一個觸點(diǎn)磨損，那么回路會斷開并且MCR失電。如果固態(tài)設(shè)備出現(xiàn)故障，

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