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pan563900060
這一切，只因為，我相信。
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樓主  發(fā)表于: 2013-09-05 17:54
描述：程序指令圖示
圖片：
請教怎么理解這個(gè)指令，看不懂是什么意思。懂的請指點(diǎn)下。。謝謝！
這一切，只因為，我相信。
fjqz00
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1樓  發(fā)表于: 2013-09-06 09:43
第一次循環(huán)是指PLC上電后，只有第一個(gè)掃描周期得電，以后就一直是斷開(kāi)狀態(tài)

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