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ABB YPP110A
輸入掃描 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,並將輸入信號存入輸入映像區,輸入映像存儲器被刷新。在程序執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在執行程序和處理數據時,不直接使用現場當時的輸入信號,而使用本次採樣時輸入到映像區中的數據。如果輸入設備能使PLC輸入端形成閉合回路,對應輸入端編號的內部輸入繼電器內保存為“1”,即相當於繼電器線圈導通。在程序執行過程中,該編號對應的觸點動作;如果輸入設備能使輸入開路,則對應輸入端編號的內部輸入繼電器內保存為“0”,即相當於繼電器線圈沒導通,在程序執行過程中,該編號對應的觸點不動作。如果在PLC處於非輸入掃描的階段,PLC外的輸入設備狀態發生了變化,內部輸入繼電器也不會發生變化,要等到下一個輸入掃描階段才能根據此時的輸入狀態來刷新。所以,對於少於十幾毫秒的輸入信號,經常採集不到。
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