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

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