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1303339679
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樓主  發(fā)表于: 2015-05-11 09:01
怎么理解呢，實(shí)際應用中又是如何呢？
chendaqing
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1樓  發(fā)表于: 2015-05-11 10:45
開(kāi)關(guān)選擇常閉觸點(diǎn),程序中寫(xiě)常開(kāi)的,這樣正常狀態(tài)下就是接通有信號的

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