邏輯程序的檢和運算在每次掃描結(jié)束后,對用戶程序進行校驗和計算。由于這要花很長時間,才能進行整個程序的校驗和計算,那么可在CPU圖示屏幕上校驗和規(guī)定從0-32的字數(shù)。這可參考在“編程軟件用戶手冊(GFK-0466)”中第十章第三節(jié)”CPU模塊配置”部分。如果被運算的校驗和與參考和不相匹配,將引發(fā)除標志外的程序校驗和故障。這將形成一個故障插人PLC故障表中,則PLC狀態(tài)轉(zhuǎn)人STOP狀態(tài)。如果校驗和運算出現(xiàn)故障,編程器通訊窗口不受影響。

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