PID块设定一个CV输出给过程,并使用过程反馈回来的PV值来确定Error,以便调节下一次的CV输出值。总计时间是-一个关键的过程参数,这个参数确定PV在多长时间后响应CV的变化。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–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,那麼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。
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