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6AV6545-0DA10-0AX0
發(fā)布者:sykj1188  發(fā)布時(shí)間:2020-04-29 14:20:33
DCS系統(tǒng)是繼PLC之外的一大自動化控制系統(tǒng),它在化工、火電等領(lǐng)域的應(yīng)用極為廣泛,但是生產(chǎn)方面的自動化技術(shù)需求進(jìn)一步提高,傳統(tǒng)的DCS系統(tǒng)已不能滿足需要,需要進(jìn)行技術(shù)升級。
  DCS系統(tǒng)由多臺計(jì)算機(jī)分別控制生產(chǎn)過程中多個(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)施上一級的控制。
  經(jīng)過這些年來的不斷應(yīng)用,DCS系統(tǒng)在行業(yè)發(fā)展的一些局限性逐步體現(xiàn)出來,DCS存在的問題:
  ①1對1結(jié)構(gòu)。1臺儀表,1對傳輸線,單向傳輸1個(gè)信號。這種結(jié)構(gòu)造成接線龐雜、工程周期長、安裝費(fèi)用高、維護(hù)困難。
  ②可靠性差。模擬信號傳輸不僅***度低,且易受干擾。為此采用各種措施提高抗干擾性和傳輸***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)場模擬儀表的工作狀況,也不能對其進(jìn)行參數(shù)調(diào)整,更不能預(yù)測事故,導(dǎo)致操作員對其處于失控狀態(tài)。因操作員不能及時(shí)發(fā)現(xiàn)現(xiàn)場儀表故障,而發(fā)生事故已屢見不鮮。
  ④互操作性差。盡管模擬儀表已統(tǒng)一4~20mA信號標(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法互換。因此導(dǎo)致用戶依賴制造廠,無法使用性能價(jià)格比***的配套儀表,甚至出現(xiàn)個(gè)別制造商壟斷市場的局面
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