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張家港市
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樓主  發(fā)表于: 2011-10-10 15:16
現有一個(gè)程序，在初始狀態(tài)時(shí)補水直到高液位為止，然后在中間運行時(shí)低于中液位時(shí)開(kāi)始補水到高液位停止。初始狀態(tài)時(shí)水位有可能在中液位以上或者以下。用S7-200該如何編，原來(lái)用三菱的就用步進(jìn)的很簡(jiǎn)單的，西門(mén)子不會(huì )用步進(jìn)的，所以有點(diǎn)麻煩，啊有高手呀，該怎么寫(xiě)
zz680217
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1樓  發(fā)表于: 2011-10-10 20:17
步進(jìn)的方法很多,不要拘泥于系統提供的,例如,用SET REST指令就可以實(shí)現,簡(jiǎn)單的,用常規的起保停也可以實(shí)現.

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