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liuqiang150
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樓主  發(fā)表于: 2020-03-29 12:07
圖片:
如圖片中程序,三菱FX5U,先打開(kāi)M2,但不關(guān)閉,等待1秒以上,在打開(kāi)M4,奇怪的是為啥M5還會(huì )被M3的上升沿置位,按理說(shuō)M3的上升沿檢出只會(huì )持續一個(gè)掃描周期,同樣的程序和操作順序用臺達的就不會(huì )被置位,哪位師傅知道原因
王瑋北
ggggfnux
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1樓  發(fā)表于: 2020-03-30 10:35
問(wèn)題就在于STL指令在不執行的時(shí)候它是跳轉狀態(tài),就是STL到RETSTL之間沒(méi)有進(jìn)行掃描了,在你通S0的那個(gè)掃描周期里,STL到RETSTL之間的M3確實(shí)是上升沿。還有一個(gè)要注意的就是STL從ON變到OFF的時(shí)候,是有一個(gè)OFF狀態(tài)的執行,也就是有一個(gè)掃描周期,STL到RETSTL之間會(huì )進(jìn)行掃描。

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