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mdayan
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樓主  發(fā)表于: 2011-10-24 11:48
PNP輸出線(xiàn)和負極之間串一個(gè)24VDC的繼電器，再引一負極線(xiàn)通過(guò)繼電器的常開(kāi)觸點(diǎn)輸出，作為NPN傳感器的輸出線(xiàn)，原正極和負極照樣接。輸出線(xiàn)接到PLC輸入點(diǎn)，該點(diǎn)就亮，但傳感器沒(méi)有碰金屬體，（即使傳感器碰到金屬，該點(diǎn)沒(méi)有變化，還是亮）這是為什么，該如何做了？謝謝各位高手指點(diǎn)。
nswrq
過(guò)好每一 天
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1樓  發(fā)表于: 2011-10-25 21:44
其實(shí)很檢單，學(xué)學(xué)

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