描述
DCS控制系統(tǒng)中的I/O
控制系統(tǒng)需要建立信號的輸入和輸出通道,這就是I/O。DCS中的I/O一般是模塊化的,一個I/O模塊上有一個或多個I/O通道,用來連接傳感器和執(zhí)行器(調(diào)節(jié)閥)。
DCS的控制單元:一個過程控制站是有幾個機架組成,每個機架可以擺放一定數(shù)量的模塊。CPU所在的機架被稱為CPU單元,同一個過程站中只能有一個CPU單元,其他只用來擺放I/O模塊的機架就是I/O單元。I/O單元與CPU是通過現(xiàn)場總線連接的。
常用的I/O信號一般分為:AI–模擬量輸入信號;AO–模擬量輸出信號;DI–數(shù)字量輸入信號;DO–數(shù)字量輸出信號。
#?DCS系統(tǒng)的選型設(shè)計調(diào)試
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