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ogreman
Only The Stronger Survive
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樓主  發(fā)表于: 2012-11-29 14:16
圖片：
如下圖所以，2個(gè)NPN傳感器并接入PLC，這種邏輯關(guān)系式或，只要其中一個(gè)有輸入，PLC則有輸入。如果想讓2個(gè)NPN感應器，接成邏輯與的關(guān)系，需要2個(gè)傳感器都有輸入時(shí)才有輸入到PLC,這個(gè)該怎么接，可行不？[
卓發(fā)智能
相互學(xué)習，共同進(jìn)步。
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1樓  發(fā)表于: 2012-11-30 10:15
大家想過(guò)沒(méi)有？如4樓圖中所示，存在這樣一個(gè)邏輯問(wèn)題：就是(如圖中)上面的感應器需先導通，而后下面的感應器才能起作用，否則不行。所以實(shí)際應用時(shí)要注意這問(wèn)題的存在。
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