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zhaotingjie
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樓主  發(fā)表于: 2010-10-14 15:45


程序中T0計時(shí)后閉合，T1開(kāi)始計時(shí)，T1計時(shí)后為什么不會(huì )閉合？因為（P）沒(méi)有上升沿信號，Q0.0也沒(méi)有閉合。
[ 此帖被zhaotingjie在2010-10-15 17:29重新編輯 ]
wwcwwc
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1樓  發(fā)表于: 2010-10-16 08:53
你的問(wèn)題在于理解上升沿的問(wèn)題了。300中的Q0.0要使置1，將用到置位（SET）。在一個(gè)掃描周期內你無(wú)法看到它的1狀態(tài)。
200；300都一樣用“沿”就必須用“SET”；“RST”。

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