西门子模块6ES7331-7HF01-0AB0

6ES7331-7HF01-0AB0

1）稳定复现的报错。

原因：累加变量sum的数据类型为uint类型（双字节），当累加10次时会导致数据溢出，sum只保留了低16位的数，导致数值错误。

解决措施：将sum由uint改为duint类型，保证累加值不会因溢出而出错。

注：均值滤波的举一反三。

（2）作出以上更改后，计算均值仍会不稳定报错。

原因：10次模拟量采集的理论时间与实际运行时间是有差异的。以50ms为采集周期，理论上500ms可以完成10次采集，而实际上还有代码运行时间等误差，在500ms内无法完成10次采集（可能只采集了9次），导致计数变量count无法累加到10，也就无法在count==10时进行均值计算。

解决措施：将采集时间增大，在（采集周期*采集次数）的基础上再加上150ms作为滤波计算的时间周期。

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