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機電小劉
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樓主  發(fā)表于: 2019-02-21 11:38
以三菱為例，輸入指令尾部加P加F可得到上升沿和下降沿，輸出指令像移位，加減乘除可以加P，為什么無(wú)法加F?
這怎么理解？？？求大神指點(diǎn)
wangnaizhi
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1樓  發(fā)表于: 2019-02-21 11:55
可能是邏輯的問(wèn)題吧  比如一行程序 你肯定需要的是前面的條件都導通了 然后執行一下程序  難道你想要前面的條件OFF的時(shí)候去執行  這樣做有什么意義呢  并且前面的條件本身就有這個(gè)功能  用下降沿去觸發(fā)  感覺(jué)有的事情不要鉆牛角尖

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