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              新聞資訊
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              DCS系統的特點

              2021-11-19 09:19:08 來源:http://www.eboudy.com/ 53

              DCS系統的關鍵是通信。也可以說數據公路是分散控制系統DCS的脊柱。由于它的任務是為系統所有部件之間提供通信網絡,因此,數據公路自身的設計就決定了總體的靈活。數據公路的媒體可以是:一對絞線、同軸電纜或光纖電纜。
              The key of DCS system is communication. It can also be said that the data highway is the backbone of DCS. Because its task is to provide communication network between all components of the system, the design of data highway itself determines the overall flexibility. The media of the data highway can be a pair of twisted pair, coaxial cable or optical fiber cable.
              通過數據公路的設計參數,基本上可以了解一個特定DCS系統的相對優點與弱點。
              Through the design parameters of data highway, we can basically understand the relative advantages and disadvantages of a specific DCS system.
              (1)系統能處理多少I/O信息。
              (1) How much I / O information can the system process.
              (2)系統能處理多少與控制有關的控制回路的信息。
              (2) How much control loop information related to control can the system process.
              (3)能適應多少用戶和裝置(CRT、控制站等)。
              (3) How many users and devices can be adapted (CRT, control station, etc.).
              (4)傳輸數據的完整性是怎樣檢查的。
              (4) How to check the integrity of the transmitted data.
              (5)數據公路的允許長度是多少。
              (5) What is the allowable length of the data highway.
              (6)數據公路能支持多少支路。
              (6) How many branches can the data highway support.
              (7)數據公路是否能支持由其它制造廠生產的硬件(可編程序控制、計算機、數據記錄裝置等)。
              (7) Whether the data highway can support the hardware produced by other manufacturers (programmable control, computer, data recording device, etc.).
              為保證通信的完整,大部分DCS廠家都能提供冗余數據公路。
              In order to ensure the integrity of communication, most DCS manufacturers can provide redundant data highway.
              為了保證系統的性,使用了復雜的通信規約和檢錯技術。所謂通信規約就是一組規則,用以保證所傳輸的數據被接收,并且被理解得和發送的數據一樣。
              In order to ensure the reliability of the system, complex communication protocols and error detection technology are used. The so-called communication protocol is a set of rules to ensure that the transmitted data is received and understood as the transmitted data.
              目前在DCS系統中一般使用兩類通信手段,即同步的和異步的,同步通信依靠一個時鐘信號來調節數據的傳輸和接收,異步網絡采用沒有時鐘的報告系統。
              At present, two kinds of communication means are generally used in DCS system, namely synchronous and asynchronous. Synchronous communication relies on a clock signal to regulate the transmission and reception of data, and asynchronous network adopts a reporting system without clock.
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