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yunfeng36
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樓主  發(fā)表于: 2013-06-03 10:24
PLC 梯形圖在PLC中的執行順序是怎樣的？
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1樓  發(fā)表于: 2013-07-18 20:28
引用
引用第3樓王志勇愛(ài)媳婦于2013-06-03 20:33發(fā)表的  :
梯形圖沒(méi)有什么從左到右，從上到下的說(shuō)法。當驅動(dòng)條件為真時(shí)，就會(huì )執行指令。（當然雙線(xiàn)圈等錯誤程序是不行的）

這個(gè)可有，只是雙線(xiàn)圈時(shí)的輸出結果以最后掃描到的狀態(tài)為準，并不是錯誤，當然為了避免發(fā)生混亂，最好是避免用雙線(xiàn)圈。。。。

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