保持置位線圈和復(fù)位線圈與置位和復(fù)位線圈類似。但雖經(jīng)電源消失或當(dāng)PLC由STOP轉(zhuǎn)為RUN模式時(shí),它們?nèi)员３肿?。一個(gè)保持置位線圈當(dāng)其通電時(shí),將把一個(gè)離散地址置為ON。這個(gè)地址將一直保持為ON,直到由一保持復(fù)位線圈所復(fù)位為止。保持置位線圈將為既定的參考地址,而把一個(gè)非定義結(jié)果寫人轉(zhuǎn)換位(參見(jiàn)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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