計算機(jī)控制系統(tǒng)與所控制的生產(chǎn)過程密切相關(guān)，根據(jù)生產(chǎn)過程的復(fù)雜程度和工藝要求的不同，

系統(tǒng)設(shè)計者可采用不同的控制方案?，F(xiàn)從控制目的、系統(tǒng)構(gòu)成的角度介紹幾種不同類型的計算

機(jī)控制系統(tǒng)。

?2.1.2.1

數(shù)據(jù)采集系統(tǒng)(DAS)

數(shù)據(jù)采集系統(tǒng)(Data Acquisition System，DAS)是計算機(jī)應(yīng)用于生產(chǎn)

過程控制最早、也是最基本的一種類型，計算機(jī)控制系統(tǒng)與所控制的生產(chǎn)過程密切相關(guān)，根據(jù)生產(chǎn)過程的復(fù)雜程度和工藝要求的不同，系統(tǒng)設(shè)計者可采用不同的控制方案?，F(xiàn)從控制目的、系統(tǒng)構(gòu)成的角度介紹幾種不同類型的計算機(jī)控制系統(tǒng)。

?2.1.2.1

數(shù)據(jù)采集系統(tǒng)(DAS)

數(shù)據(jù)采集系統(tǒng)(Data Acquisition System，DAS)是計算機(jī)應(yīng)用于生產(chǎn)過程控制最早、也是最基本的一種類型，直接數(shù)字控制(Direct Digital Control，DDC)系統(tǒng)是用一臺計算機(jī)不僅完成對多個被控參數(shù)的數(shù)據(jù)采集，而且能按一定的控制規(guī)律進(jìn)行實時決策，并通過過程輸出通道發(fā)出控制信號，現(xiàn)對生產(chǎn)過程的閉環(huán)控制，所示。為了操作方便，DDC系統(tǒng)還配置一個包括給定、顯示、報警等功能的操作控制臺。

?

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