保持置位線圈和復位線圈與置位和復位線圈類似。但雖經(jīng)電源消失或當PLC由STOP轉(zhuǎn)為RUN模式時,它們?nèi)员３肿　Ｒ粋€保持置位線圈當其通電時,將把一個離散地址置為ON。這個地址將一直保持為ON,直到由一保持復位線圈所復位為止。保持置位線圈將為既定的參考地址,而把一個非定義結(jié)果寫人轉(zhuǎn)換位(參見第二章操作系統(tǒng)中關(guān)于“轉(zhuǎn)換與超馳”的情況)。

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