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。
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