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數量多+++++++++++++氣++++++++大量庫存停產備件
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DCS它可以控制和監視工藝全過程,對自身進行診斷、維護和組態。但是,由于自身的致命弱點,其I/O信號采用傳統的模擬量信號,因此,它無法在DCS工程師站上對現場儀表(含變送器、執行器等)進行遠方診斷、維護和組態。FCS采用全數字化技術,數字智能現場裝置發送多變量信息,而不僅僅是單變量信息,并且還具備檢測信息差錯的功能。FCS采用的是雙向數字通訊現場總線信號制。因此,它可以對現場裝置(含變送器、執行機構等)進行遠方診斷、維護和組態。FCS的這點優越性是DCS無法相比的。
(6)FCS由于信息處理現場化,與DCS相比可以省往相當數目的隔離器、端子柜、I/O終端、I/O卡件、I/O文件及I/O柜,同時也節省了I/O裝置及裝置室的空間與占地面積。有專家以為可以省往60%。
(7)與(6)同樣理由,FCS可以減少大量電纜與敷設電纜用的橋架等,同時也節省了設計、安裝和維護用度。有專家以為可以節省66%。
對于(6)、(7)兩點應補充說明的是,采用FCS系統,節省投資的效果是不用懷疑的,但是否如有的專家所說達60~66%。這些數字在多篇文章中出現,編者以為這是相互轉摘的結果,目前還未找到這些數字的原始出處,因此,讀者在引用這些數字時要慎重。
(8)FCS相對于DCS組態簡單,由于結構、性能標準化,便于安裝、運行、維護。
(9)用于過程控制的FCS設計開發要點。這一點并不作為與DCS的比較,只是說明用于過程控制或者說用于模擬連續過程類的FCS在設計開發中應重點考慮的題目。
1)要求總線本安防爆功能,而且是頭等重要的。
2)基本監控如流量、料位、溫度、壓力等的變化是緩慢的,而且還有滯后效應,因此,節點監控并不需要快電子學的響應時間,但要求有復雜的模擬量處理能力。這一物理特征決定了系統基本上多采用主一從之間的集中輪詢制,這在技術上是公道的,在經濟上是有利的。
3)流量、料位、溫度、壓力等參數的丈量,其物理原理是古典的,但傳感器、變送器及控制器應向數字智能化發展。
4)作為針對連續過程類及其儀器儀表而開發的FCS,應側重于低速總線H1的設計完善。
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