DCS一般都提供统一的数据库。换句话说，在DCS系统中一旦一个数据存在于数据库中，就可在任何情况下引用，比如在组态软件中，在监控软件中，在趋势图中，在报表中 而PLC系统的数据库通常都不是统一的，组态软件和监控软件甚至归档软件都有自己的数据库。为什么常说西门子的S7 400要到了414以上才称为DCS？因为西门子的PCS7系统才使用统一的数据库，而PCS7要求控制器起码到S7 414-3以上的型号。
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