140CPU11303
由上述內(nèi)容很容易看出：SCADA，DCS是一種概念，而PLC是一種產(chǎn)品，三者不具可比性：
1、PLC是一種產(chǎn)品，由它可以構成SCADA，DCS；
2、DCS 是過程控制發(fā)展起來的，PLC是繼電器—邏輯控制系統(tǒng)發(fā)展起來的；
3、PLC 是設備，DCS，SCADA是系統(tǒng)。
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(chǎn)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(wǎng)絡的角度來說，它們是統(tǒng)一的，之所以有區(qū)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(yè)，PLC對處理速度要求高，因為經(jīng)常用在聯(lián)鎖上，甚至是故障安全系統(tǒng)，SCADA也有一些特殊要求，如振動監(jiān)測，流量計算，調(diào)峰調(diào)谷等等。
因此，也可以簡單的認為：
SCADA是調(diào)度管理層
DCS是廠站管理層
PLC是現(xiàn)場設備層
SCADA系統(tǒng)是一個歷史悠久，但仍處于快速發(fā)展中的“新生”事物，具有系統(tǒng)復雜、接口標準開放與Internet網(wǎng)絡深度融合等特點，需要整合產(chǎn)、學、研、用各方面的研究SCADA系統(tǒng)的信息安全理論和技術，鼓勵國內(nèi)SCADA系統(tǒng)廠商進行技術積累和創(chuàng)新，培養(yǎng)達到世界先進水平的SCADA系統(tǒng)技術研發(fā)團隊，逐步在重點行業(yè)中推廣使用自主知識產(chǎn)權的國產(chǎn)化SCADA系統(tǒng)替換國外系統(tǒng)。
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