如下面关于设定回环增 益部分所讨论的,在 CV 发生阶跃时,总计时间常量,Tp+Tc,是一阶系统 PV 值达到 CV 值 63%所需要的时间。如果 PID 块的采样时间不小于总计时间 的 1/2,那麽 PID 块无法实现对此过程的控制。太大的采样时间会使控制不稳 定 。 采样时将不应大于总计时
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