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hwl666
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樓主  發(fā)表于: 2010-12-15 08:36
學(xué)了一段時(shí)間PLC，遇到了下面的問(wèn)題，突然疑惑了，感覺(jué)什么都不懂了，糾結�。�
如下圖接線(xiàn)，程序里X1的常閉觸點(diǎn)
能夠使用嗎？
zsb2010
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1樓  發(fā)表于: 2010-12-16 16:32
可以用的，
你把外面的X1和COM之間想象成有一個(gè)中間繼電器的線(xiàn)圈，把程序里面的X1的常閉觸點(diǎn)想象成中間繼電器的常閉觸點(diǎn)就好理解了，
如外面開(kāi)關(guān)閉合，則中間繼電器線(xiàn)圈得電，它的常閉觸點(diǎn)要動(dòng)作，變成斷開(kāi)了，所以此時(shí)程序內的X1常閉斷開(kāi)。
若外面開(kāi)關(guān)斷開(kāi)，則中間繼電器線(xiàn)圈失電，它的常閉觸點(diǎn)不動(dòng)作，還是閉合的，所以此時(shí)程序里的X1常閉是閉合的

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