DCS是计算机技术、控制技术和网络技术高度结合的产物。DCS通常采用若干个控制器(过程站)对一个生产过程中的众多控制点进行控制，各控制器间通过网络连接并可进行数据交换。操作采用计算机操作站，通过网络与控制器连接，收集生产数据，传达操作指令。因此，DCS的主要特点归结为一句话就是：分散控制集中管理。
从结构上划分，DCS包括过程级、操作级和管理级。过程级主要由过程控制站、I/O单元和现场仪表组成，是系统控制功能的主要实施部分。操作级包括：操作员站和工程师站，完成系统的操作和组态。管理级主要是指工厂管理信息系统(MIS系统)，作为DCS更高层次的应用，目前国内纸行业应用到这一层的系统较少。
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