就效率而言,操作系統(tǒng)將采用比RUN模式中所用分時值(通常每窗口約50ms)更長些的分時值。351/352 CPU的鑰匙開關(guān):改變方式和閃爍保護351 CPU有-鑰匙開關(guān),此開關(guān)在模塊的前方,可用于保護閃爍存儲器免遭改寫。當(dāng)你將鑰匙轉(zhuǎn)動至ON/RUN位置時,如鑰匙不轉(zhuǎn)至OFF位,則無人能夠改變內(nèi)爍存儲器。從351 CPU和352 CPU的版本7開始,鑰匙開關(guān)還有另一項功能:即可將PLC切換至STOP方式和RUN方式以及清除非致命故障,這在下一節(jié)進行討論。

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