PLC執(zhí)行程序的過程分為哪些階段？實(shí)際在整個運(yùn)行過程上，PLC的CPU以一定的掃描速度重復(fù)執(zhí)行輸入、執(zhí)行、輸出三個階段。完成這三個階段便被成為一個掃描周期。

PLC的掃描工作過程：

1、輸入采樣階段

在這一階段中，PLC以掃描方式讀入所有輸入端子上的輸入信號，并將各輸入狀態(tài)存入對應(yīng)的輸入映像寄存器中。此時，輸入映像寄存器被刷斷。在程序執(zhí)行階段和輸出刷新階段中，輸入映像存儲器與外界隔離，其內(nèi)容保持不變，直至下一個掃描周期的輸入掃描階段，才被重新讀入的輸入信號刷新。可見，PLC在執(zhí)行程序和處理數(shù)據(jù)時，不直接使用現(xiàn)場當(dāng)時的輸入信號，而使用本次采樣時輸入到映像區(qū)中的數(shù)據(jù)。一般來說，輸入信號的寬度要大于一個掃描周期，否則可能造成信號的丟失。

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