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樓主  發(fā)表于: 2019-06-24 09:31
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今天誤將給PLC輸入輸出用的開(kāi)關(guān)電源24v兩根線(xiàn)接反了，相當于正負極對調了一下。結果導致所有輸出全部是導通的，就是正負反了一下。反思一下為何直接能導通呢？自己畫(huà)了個(gè)圖還是沒(méi)找到答案。大家能否幫助分析一下。PLC為晶體管低電平輸出的。

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