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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？
wwcwwc
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1樓  發(fā)表于: 2010-12-15 11:39
PLC內部的接點(diǎn)是根據外部接點(diǎn)的改變而改變的，這種問(wèn)題是開(kāi)始學(xué)習PLC的時(shí)侯會(huì )出現，正常啊。因為一下子不可能理解PLC編程的“行規”。其中PLC的優(yōu)勢就在這里。用常規的接線(xiàn)方式如果需要一個(gè)“NO”接點(diǎn)而用了“NC”接點(diǎn)。豈不是需要重新改變接線(xiàn)方式。但是如果使用PLC你在程序中就可以改變過(guò)來(lái)方便嗎？

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