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qizhitianyue
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樓主  發(fā)表于: 2013-07-02 01:40
我是半路出家做plc工作的 有的基礎問(wèn)題還請賜教
關(guān)于NPN  PNP問(wèn)題困惑了很長(cháng)時(shí)間 在網(wǎng)上看了很多，內容都大同小異，越看越迷惑
誰(shuí)能用比較直白的說(shuō)明一下
為什么plc輸入端正常是N24和信號端24v  報警斷開(kāi)時(shí)是0v N24不應該是低電平嗎
輸出端子無(wú)輸出Y和P24是-24v      有輸出Y和N24是24v
wananjushi
萬(wàn)安居士
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1樓  發(fā)表于: 2013-07-02 09:16
應該COM點(diǎn)接負極
wananjushi

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