或者积分器的Ki*Error*dt值趋向于0的情况。例如，如果有这样-一个非常缓慢的过程，预计PV值会用10小时或者36000秒钟的时间到达最终值的63%时，采样时间应大于或等于40秒。除非过程非常快，否则不需要将采样时间设为0,从而每个扫描周期都进行PID运算。如果很多PID回路使用了大于扫描周期的采样时间
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