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playboyss
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樓主  發(fā)表于: 2017-03-11 19:24
圖片：
如圖，開(kāi)關(guān)1合上時(shí)，X1、X2輸入信號燈會(huì )同時(shí)亮。為什么？？
兩個(gè)24V電源中，上面那個(gè)電源似乎沒(méi)有形成回路啊。
補充一句：兩個(gè)輸入模塊分別接在兩個(gè)不同PLC上
[ 此帖被playboyss在2017-03-15 12:08重新編輯 ]
vios1161
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1樓  發(fā)表于: 2017-03-12 07:51
不會(huì )通…要把 2 個(gè) power supply 的負電接成一點(diǎn)，達到共地及共準位，才會(huì )通。

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