DCS一般都提供統(tǒng)一的數(shù)據(jù)庫。換句話說，在DCS系統(tǒng)中一旦一個數(shù)據(jù)存在于數(shù)據(jù)庫中，就可在任何情況下引用，比如在組態(tài)軟件中，在監(jiān)控軟件中，在趨勢圖中，在報表中 而PLC系統(tǒng)的數(shù)據(jù)庫通常都不是統(tǒng)一的，組態(tài)軟件和監(jiān)控軟件甚至歸檔軟件都有自己的數(shù)據(jù)庫。為什么常說西門子的S7 400要到了414以上才稱為DCS？因為西門子的PCS7系統(tǒng)才使用統(tǒng)一的數(shù)據(jù)庫，而PCS7要求控制器起碼到S7 414-3以上的型號。
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