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樓主  發(fā)表于: 2010-07-17 17:55
PLC在向外部設備發(fā)送指令時(shí)，當指令發(fā)送完畢時(shí)是不是有一個(gè)標志位標志指令已經(jīng)發(fā)送完畢；當有數據返回給PLC時(shí)，是不是也有一個(gè)標志位表明數據已經(jīng)接受完畢？希望大家給予指教，謝謝！
hlq_0815
人生的成功不在于拿到一副好牌，而是怎樣將壞牌打好。
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1樓  發(fā)表于: 2010-07-17 22:41
對！你太有才啦！
人生的成功不在于拿到一副好牌，而是怎樣將壞牌打好。

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