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(shí)間常數(shù).此常數(shù)為當(dāng)CV改變時(shí)的PV快速響應(yīng)。正如下文中討論的設(shè)置回路增益,總時(shí)間常數(shù)Tp+Tc,為CV躍遷時(shí)的PV達(dá)到最終值的63%時(shí)所需時(shí)間。PID模塊只有在采樣時(shí)間低于總時(shí)間常數(shù)半值時(shí)方可用于控制過程。

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Honeywell DC3003-0-000-2?-00-0111 DC300300002000?111

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HONEYWELL I/O INTERFACE BOARD 14501690-003

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