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DCS系統(tǒng)由多臺(tái)計(jì)算機(jī)分別控制生產(chǎn)過(guò)程中多個(gè)控制回路，同時(shí)又可集中獲取數(shù)據(jù)、集中管理和集中控制的自動(dòng)控制系統(tǒng)。分布式控制系統(tǒng)采用微處理機(jī)分別控制各個(gè)回路，而用中小型工業(yè)控制計(jì)算機(jī)或高性能的微處理機(jī)實(shí)施上一級(jí)的控制。
經(jīng)過(guò)多年來(lái)的不斷應(yīng)用，DCS系統(tǒng)在行業(yè)發(fā)展中的一些局限性逐步體現(xiàn)出來(lái)：
(1)1對(duì)1結(jié)構(gòu)。1臺(tái)儀表，1對(duì)傳輸線，單向傳輸1個(gè)信號(hào)。這種結(jié)構(gòu)造成接線龐雜、工程周期長(zhǎng)、安裝費(fèi)用高、維護(hù)困難。
(2)可靠性差。模擬信號(hào)傳輸不僅精確度低，且易受干擾。為此采用各種措施提高抗干擾性和傳輸精確度，其結(jié)果是增加了成本。
(3)失控狀態(tài)。操作員在控制室既不了解現(xiàn)場(chǎng)模擬儀表的工作狀況，也不能對(duì)其進(jìn)行參數(shù)調(diào)整，更不能預(yù)測(cè)事故，導(dǎo)致操作員對(duì)其處于失控狀態(tài)。因操作員不能及時(shí)發(fā)現(xiàn)現(xiàn)場(chǎng)儀表故障，而發(fā)生事故已屢見(jiàn)不鮮。
(4)互操作性差。盡管模擬儀表已統(tǒng)一4～20mA信號(hào)標(biāo)準(zhǔn)，可大部分技術(shù)參數(shù)仍由制造商自定，致使不同品牌儀表無(wú)法互換。因此導(dǎo)致用戶(hù)依賴(lài)制造廠，無(wú)法使用性能價(jià)格比最優(yōu)的配套儀表，甚至出現(xiàn)個(gè)別制造商壟斷市場(chǎng)的局面。
dcs控制系統(tǒng)發(fā)展至今已相當(dāng)成熟和實(shí)用，毫無(wú)疑問(wèn)，它仍是當(dāng)前工業(yè)自動(dòng)化插入式電磁流量計(jì)。
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