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yl116645
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樓主  發(fā)表于: 2012-09-24 21:31
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請高人幫我指點(diǎn)一下,為什么我用的高速計數器比較置位指令不能置位。程序如下:
S0中Y0脈沖RST  C235,C236,M0,M2
S11中2個(gè)高速計數器在Y4接通后開(kāi)始計數,但是有的時(shí)候C235計數超過(guò)設定值也沒(méi)有動(dòng)作,有的時(shí)候M0動(dòng)作了,也跳轉了但是下面的通訊程序不能發(fā)送,電機一直在轉。但是有個(gè)特點(diǎn)就是我把電源拉掉,在重新打開(kāi),PLC徹底復位這個(gè)程序可以穩定運行到最后一步。想來(lái)想去想不通。請高手指點(diǎn)迷津,謝謝!
rosephy
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1樓  發(fā)表于: 2012-09-24 22:13
不是很熟悉SFC,不成熟的探討一下,你的M0上升沿脈沖觸點(diǎn)換成常開(kāi)點(diǎn)試試,感覺(jué)的你的這個(gè)程序不穩定是由于時(shí)序問(wèn)題造成的

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