PID模块可把CV输出设置给该过程并使用过程反馈PV来确定误差以调整下次CV输出。某关键过程参数即总的时间常数.此常数为当CV改变时的PV快速响应。正如下文中讨论的设置回路增益,总时间常数Tp+Tc,为CV跃迁时的PV达到最终值的63%时所需时间。PID模块只有在采样时间低于总时间常数半值时方可用于控制过程。
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