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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)。
sunboy1234
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1樓  發(fā)表于: 2011-10-24 11:52
PNP正極和輸出線(xiàn)接中繼線(xiàn)圈
sunboy1234
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2樓  發(fā)表于: 2011-10-24 11:54
或者PNP可以接個(gè)下拉電阻，同樣可以實(shí)現信號轉換功能

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