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qinglin2314
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樓主  發(fā)表于: 2024-06-10 21:54
在現場(chǎng)接完接近開(kāi)關(guān)后測量開(kāi)關(guān)電源的DC24V對地電壓是8V， DC0V對地電壓是-16V。
PLC的DI點(diǎn)也能接收到現場(chǎng)接近開(kāi)關(guān)的信號。
但不明白DC24V對地電壓為什么會(huì )變成8V了，DC0V對地電壓變成-16V了，幫忙看下會(huì )是什么問(wèn)題
jixzang
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1樓  發(fā)表于: 2024-06-13 08:53
開(kāi)關(guān)電源一般不直接接地，而是用電容浮接地，樓主所測電壓是正常的，如果擔心可以負極或正極接地，一般不接地的原因是怕多個(gè)電源串聯(lián)、并聯(lián)、共陰、共陽(yáng)時(shí)做成短路。

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