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fengbingyuan
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樓主  發(fā)表于: 2009-07-22 18:31
請問(wèn)各前輩,我從書(shū)上看到這樣一個(gè)例子,一臺用于三層樓的升降機,到達3樓的平層脈沖個(gè)數是150000,把一個(gè)三線(xiàn)編碼器的輸出端接至FX2N-64MR的X0,即利用PLC高速計數器C235進(jìn)行計數,書(shū)上有這么一條程序:
LD。停福埃埃;
OUT。茫玻常怠。耍保福埃埃埃埃埃
請問(wèn),(1)脈沖是從X0輸入的,為什么程序中計數觸發(fā)用M8000;
         (2)到達3樓的平層脈沖個(gè)數才150000個(gè)脈沖, "OUT。茫玻常怠。耍保福埃埃埃埃"中怎么用K1800000這么多呢?請各前輩指點(diǎn)啊!
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1樓  發(fā)表于: 2009-07-23 16:44
那個(gè)是最大的計數器范圍,你實(shí)際使用的是當前值,就比如你面前放一炸彈,你不管他什么時(shí)候爆炸,就看現在還有幾秒鐘爆炸就OK了。
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