ABB YB161102-BV
2、DCS或TDCS
(1)分散控制系統(tǒng)DCS與集散控制系統(tǒng)TDCS是集4C(Communication，Computer， Control、CRT)技術于一身的監(jiān)控技術。
(2)從上到下的樹狀拓撲大系統(tǒng)，其中通信(Communication)是關鍵。
(3)PID在中斷站中，中斷站聯(lián)接計算機與現(xiàn)場儀器儀表與控制裝置。
(4)是樹狀拓撲和并行連續(xù)的鏈路結構，也有大量電纜從中繼站并行到現(xiàn)場儀器儀表。
(5)模擬信號，A/D—D/A、帶微處理器的混合。
(6)一臺儀表一對線接到I/O，由控制站掛到局域網(wǎng)LAN。
(7)DCS是控制(工程師站)、操作(操作員站)、現(xiàn)場儀表(現(xiàn)場測控站)的3級結構。
(8)缺點是成本高，各公司產品不能互換，不能互操作，大DCS系統(tǒng)是各家不同的。
(9)用于大規(guī)模的連續(xù)過程控制，如石化等。
(10)制造商：Bailey(美)、Westinghous(美)、HITACH(日)、LEEDS & NORTHRMP(美)、SIEMENS(德)、Foxboro(美)、ABB (瑞士)、Hartmann & Braun(德)、Yokogawa(日)、Honewell(美國)、Taylor(美)等。
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