每两次执行的实际时间间隔为18毫秒。PID函数不能在–个扫描周期内被多次调用。执行PID函数的最长时间间隔为10.9分钟。PID函数在最后一次执行后100毫秒内补偿实际的逝去时间。CPU逝去时间大于或等于最后–次执行的时间+采样时间时，执行PID运算。如果采样时间设为0，函数每次被使能时即执行:然而，如上所述，PID函数的最小执行时间为10毫秒
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