A06B-6141-H011#H580，A06B-6141-H011#H580，A06B-6141-H011#H580
常閉觸點輸入信號處理的電路圖及PLC梯形圖
在些輸入信號只能由常閉觸點提供，圖1a是控制電機運行的繼電路圖，SB1和SB2分別是起動按鈕和停止按鈕，如果將它們的常開觸點接到PLC的輸入端，梯形圖中觸點的類型與圖1a完全一致。如果接入PLC的是SB2的常閉觸點，按下圖1b中的SB2，其常閉觸點斷開，X1變?yōu)?/span>OFF，它的常開觸點斷開，顯然在梯形圖中應將X1的常開觸點與Y0的線圈串聯(lián)（見圖1c），但是這時在梯形圖中所用的X1的觸點類型與PLC外接SB2的常開觸點時剛好相反，與繼電器電路圖中的習慣也是相反的。建議盡可能用常開觸點作PLC的輸入信號。
如果某些信號只能用常閉觸點輸入，可以按輸入全部為常開觸點來設(shè)計，然后將梯形圖中相應的輸入繼電器的觸點改為相反的觸點，即常開觸點改為常閉觸點，常閉觸點改為常開觸點。
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