140DDI67300C

140DDI67300C

140DDI67300C

　經(jīng)過多年來的不斷應用，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，在此總結如下：

　　1)1對1結構。1臺儀表，1對傳輸線，單向傳輸1個信號。這種結構造成接線龐雜、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)調整，更不能預測事故，導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。

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