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樓主  發(fā)表于: 2016-01-10 18:08

我的還沒(méi)弄好呢  ， 程序是書(shū)上的 ，一切都是按照書(shū)上的要求做的，就是沒(méi)反應，485通信版上的兩個(gè)LED燈在PLC上電的瞬間是亮的，然后又熄滅了，只有在按下任何按鈕的時(shí)候485通信版上的LED燈才會(huì )閃爍一下，然后有熄滅了 請問(wèn)這是怎么回事？？

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