PID模塊可把CV輸出設(shè)置給該過程并使用過程反饋PV來確定誤差以調(diào)整下次CV輸出。某關(guān)鍵過程參數(shù)即總的時間常數(shù).此常數(shù)為當(dāng)CV改變時的PV快速響應(yīng)。正如下文中討論的設(shè)置回路增益,總時間常數(shù)Tp+Tc,為CV躍遷時的PV達(dá)到最終值的63%時所需時間。PID模塊只有在采樣時間低于總時間常數(shù)半值時方可用于控制過程。

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