140CPU11303  

由上述内容很容易看出：SCADA，DCS是一种概念，而PLC是一种产品，三者不具可比性： 

1、PLC是一种产品，由它可以构成SCADA，DCS；

2、DCS 是过程控制发展起来的，PLC是继电器—逻辑控制系统发展起来的；

3、PLC 是设备，DCS，SCADA是系统。

狭义地说，DCS主要用于过程自动化，PLC主要用于工厂自动化（生产线），SCADA 主要针对广域的需求，如油田，绵延千里的管线。如果从计算机和网络的角度来说，它们是统一的，之所以有区别，主要在应用的需求， DCS常常要求高级的控制算法。如在炼油行业，PLC对处理速度要求高，因为经常用在联锁上，甚至是故障安全系统，SCADA也有一些特殊要求，如振动监测，流量计算，调峰调谷等等。

因此，也可以简单的认为：

SCADA是调度管理层

DCS是厂站管理层

PLC是现场设备层

SCADA系统是一个历史悠久，但仍处于快速发展中的“新生”事物，具有系统复杂、接口标准开放与Internet网络深度融合等特点，需要整合产、学、研、用各方面的研究SCADA系统的信息安全理论和技术，鼓励国内SCADA系统厂商进行技术积累和创新，培养达到世界先进水平的SCADA系统技术研发团队，逐步在重点行业中推广使用自主知识产权的国产化SCADA系统替换国外系统。

140CPU11303  

140CPU11303

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