逻辑程序的检和运算在每次扫描结束后,对用户程序进行校验和计算。由于这要花很长时间,才能进行整个程序的校验和计算,那么可在CPU图示屏幕上校验和规定从0-32的字数。这可参考在“编程软件用户手册(GFK-0466)”中第十章第三节”CPU模块配置”部分。如果被运算的校验和与参考和不相匹配,将引发除标志外的程序校验和故障。这将形成一个故障插人PLC故障表中,则PLC状态转人STOP状态。如果校验和运算出现故障,编程器通讯窗口不受影响。
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