恰好與實(shí)際轉(zhuǎn)換至RUN方式的操作一樣,鑰匙開(kāi)關(guān)操作在PLC進(jìn)行RUN方式之前擁有同樣的防護(hù)和檢查,即:當(dāng)PLC處于STOP/FAULT方式時(shí)PLC將通過(guò)鑰匙開(kāi)關(guān)輸人而不進(jìn)人RUN方式,不過(guò)用戶(hù)也可借助鑰匙開(kāi)關(guān)清除非致命故障,并使PLC進(jìn)入RUN方式。

 

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