IC660EBA024
IC660EBA024
IC660EBA024
IC660EBA024
從不同方向發(fā)展起來的DCS在結(jié)構(gòu)上、軟件方面有些區(qū)別。儀表公司開發(fā)的DCS的控制器的軟件部分比較符合儀表工程人員應(yīng)用的習(xí)慣，特別是組態(tài)方式比較方便。計算機公司設(shè)計的DCS的相關(guān)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(shè)備。但是，DCS的制造廠家可能專長于某一領(lǐng)域。如：HONEYWELL公司的早期產(chǎn)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(tǒng)，ROSEMOUNT公司的RS3、DeltaV大多用于化工系統(tǒng)。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(diào)設(shè)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(yè)一定要有大純滯后控制補償?shù)取Ｒ虼诉x用DCS時考慮廠家的技術(shù)人員對本行業(yè)的工藝流程熟悉程度也是很有必要的。
2.2 現(xiàn)場總線系統(tǒng)（FCS）
2.2.1 現(xiàn)場總線
現(xiàn)場總線是應(yīng)用在生產(chǎn)現(xiàn)場、在微機化測量控制設(shè)備之間實現(xiàn)雙向串行多節(jié)點數(shù)字通信的系統(tǒng)，也被稱為開放式、數(shù)字化、多點通信的底層控制網(wǎng)絡(luò)。現(xiàn)場總線技術(shù)將專用微處理器置入傳統(tǒng)的測量控制儀表中，使它們各自都有數(shù)字計算和數(shù)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(wǎng)絡(luò)系統(tǒng)，并按公開、規(guī)范的通訊協(xié)議，在位于現(xiàn)場的多個微機化測量控制設(shè)備之間以及總線儀表與遠程監(jiān)控計算機之間實現(xiàn)數(shù)據(jù)傳輸與信息交換，形成各種適應(yīng)實際需要的自動化控制系統(tǒng)。
現(xiàn)場總線是當(dāng)今自動化領(lǐng)域技術(shù)發(fā)展的熱點之一，被譽為自動化領(lǐng)域的計算機局域網(wǎng)。它的出現(xiàn)標志著工業(yè)控制技術(shù)領(lǐng)域又一個新時代的開始，其特點主要表現(xiàn)在以下方面。
(1) 全數(shù)字化:將企業(yè)管理與生產(chǎn)自動化有機結(jié)合一直是工業(yè)界夢寐以求的理想，但只有FCS出現(xiàn)以后這種理想才有可能高效、低成本地實現(xiàn)。在采用FCS的企業(yè)中，用于生產(chǎn)管理的局域網(wǎng)能夠與用于自動控制的現(xiàn)場總線網(wǎng)絡(luò)緊密銜接。此外，數(shù)字化信號固有的高精度、抗干擾特性也能提高控制系統(tǒng)的可靠性。
(2) 全分布式:在FCS中各現(xiàn)場設(shè)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(shè)備中，而不再需要一個中央控制計算機，實現(xiàn)真正的分布式控制。
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