140CPU11303  

由上述內容很容易看出：SCADA，DCS是一種概念，而PLC是一種產品，三者不具可比性： 

1、PLC是一種產品，由它可以構成SCADA，DCS；

2、DCS 是過程控制發展起來的，PLC是繼電器—邏輯控制系統發展起來的；

3、PLC 是設備，DCS，SCADA是系統。

狹義地說，DCS主要用于過程自動化，PLC主要用于工廠自動化（生產線），SCADA 主要針對廣域的需求，如油田，綿延千里的管線。如果從計算機和網絡的角度來說，它們是統一的，之所以有區別，主要在應用的需求， DCS常常要求高級的控制算法。如在煉油行業，PLC對處理速度要求高，因為經常用在聯鎖上，甚至是故障安全系統，SCADA也有一些特殊要求，如振動監測，流量計算，調峰調谷等等。

因此，也可以簡單的認為：

SCADA是調度管理層

DCS是廠站管理層

PLC是現場設備層

SCADA系統是一個歷史悠久，但仍處于快速發展中的“新生”事物，具有系統復雜、接口標準開放與Internet網絡深度融合等特點，需要整合產、學、研、用各方面的研究SCADA系統的信息安全理論和技術，鼓勵國內SCADA系統廠商進行技術積累和創新，培養達到世界先進水平的SCADA系統技術研發團隊，逐步在重點行業中推廣使用自主知識產權的國產化SCADA系統替換國外系統。

140CPU11303  

140CPU11303

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