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IC660EBA024

IC660EBA024

IC660EBA024

IC660EBA024

從不同方向發展起來的DCS在結構上、軟件方面有些區別。儀表公司開發的DCS的控制器的軟件部分比較符合儀表工程人員應用的習慣，特別是組態方式比較方便。計算機公司設計的DCS的相關軟件的功能比較強大，人機界面比較友好。

從理論上來講，DCS可以用于不同的工藝過程，它是通用的控制設備。但是，DCS的制造廠家可能專長于某一領域。如：HONEYWELL公司的早期產品TDC2000、TDC3000，主要用于石化部門。BAILEY公司的N90、INFI90主要用于電力系統，ROSEMOUNT公司的RS3、DeltaV大多用于化工系統。因為不同工藝過程會有一些特殊要求，如：石油化工部門一定要有選擇性控制，電廠一定要有電調設備和事件順序記錄模塊，造紙廠要有橫向水分控制，水泥行業一定要有大純滯后控制補償等。因此選用DCS時考慮廠家的技術人員對本行業的工藝流程熟悉程度也是很有必要的。

2.2 現場總線系統（FCS）
2.2.1 現場總線
現場總線是應用在生產現場、在微機化測量控制設備之間實現雙向串行多節點數字通信的系統，也被稱為開放式、數字化、多點通信的底層控制網絡。現場總線技術將專用微處理器置入傳統的測量控制儀表中，使它們各自都有數字計算和數字通訊能力，采用可進行簡單連接的雙絞線作為總線，把多個測量控制儀表連接成網絡系統，并按公開、規范的通訊協議，在位于現場的多個微機化測量控制設備之間以及總線儀表與遠程監控計算機之間實現數據傳輸與信息交換，形成各種適應實際需要的自動化控制系統。
現場總線是當今自動化領域技術發展的熱點之一，被譽為自動化領域的計算機局域網。它的出現標志著工業控制技術領域又一個新時代的開始，其特點主要表現在以下方面。
(1) 全數字化:將企業管理與生產自動化有機結合一直是工業界夢寐以求的理想，但只有FCS出現以后這種理想才有可能高效、低成本地實現。在采用FCS的企業中，用于生產管理的局域網能夠與用于自動控制的現場總線網絡緊密銜接。此外，數字化信號固有的高精度、抗干擾特性也能提高控制系統的可靠性。
(2) 全分布式:在FCS中各現場設備有足夠的自主性，它們彼此之間相互通信，完全可以把各種控制功能分散到各種設備中，而不再需要一個中央控制計算機，實現真正的分布式控制。

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