BACHMANN MPC270
BACHMANN MPC270
--------------**廈門莫格電氣自動化有限公司**----------
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經(jīng)過多年來的不斷應(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:
(1)1對1結(jié)構(gòu)。1臺儀表,1對傳輸線,單向傳輸1個信號。這種結(jié)構(gòu)造成接線龐雜、工程周期長、安裝費用高、維護困難。
(2)可靠性差。模擬信號傳輸不僅精確度低,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)場模擬儀表的工作狀況,也不能對其進行參數(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信號標準,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,無法使用性能價格比*的配套儀表,甚至出現(xiàn)個別制造商壟斷市場的局面。
目前,服務(wù)市場仍是關(guān)鍵DCS市場在過去幾年中主要成為了服務(wù)業(yè)務(wù),結(jié)合項目和售后或運營服務(wù)幾乎占了總收入的一半。主要自動化承包商(MAC)的概念不斷發(fā)展壯大,更具規(guī)模。ARC發(fā)現(xiàn)zui終用戶對于MAC項目有強烈的本土內(nèi)容需求,一旦項目委托出去,能保證強有力的支持。同時,MAC范圍不斷增加,經(jīng)常包括項目的電氣內(nèi)容,從而進一步降低了項目的工程成本,降低了zui終用戶的整體風險。
此外,已投運的國產(chǎn)DCS系統(tǒng)與進口產(chǎn)品比較綜合性能差距不大,各類全封閉設(shè)計模件具有免維護性能,總的I/O點數(shù)應(yīng)用也達到15000多點以上;軟件全在WINDOWS平臺運行,界面友好,組態(tài)修改方便,全中文環(huán)境,易與理解和掌握,應(yīng)用功能基本包括了電廠的全部需求。這表明DCS設(shè)計制造、性能參數(shù)方面均能滿足當前我國火電機組建設(shè)設(shè)計規(guī)范要求。
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