A20B-1001-0580

A20B-1001-0580

這樣當常閉按鈕SB2閉合時，常開觸點00401一直閉合，當SB1按鈕接通時，00400觸點接通，線圈00300得電，KM得電，電機運行;當SB2按鈕斷開時，00401觸點斷開，線圈00300失電，KM失電，電機停止運行。

由此可見，如果PLC外接線都選擇常開開關，則PLC中運行的梯形圖與繼電器控制電路圖一致;如果PLC外接線選用常閉開關，則在梯形圖中對應該常閉開關的位置應該使用常開觸點。

通常為了與繼電器控制電路圖的習慣一致，在PLC的外接線中盡可能采用常開按鈕或開關。

為什么會是這樣呢?回想PLC輸入電路，當外接常開開關斷開時，沒有電流流進輸入電路，代表PLC內部常開觸點斷開;而當外接常開開關閉合時，電流流進輸入電路，代表PLC內部常開觸點閉合。外接開關斷開與閉合與PLC內部的觸點斷開與閉合一致。

而當外接常閉開關閉合時，有電流流入輸入電路，PLC內部的常閉觸點斷開;當外接常閉開關斷開時，沒有電流流入輸入電路，PLC內部的常閉觸點閉合，可見外接常閉開關的斷開與閉合與PLC內部的常閉觸點的斷開與閉合不一致，所以不能使用PLC內部的常閉觸點來代替外接的常閉開關。

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