描述
DCS系統(tǒng)的關(guān)鍵是通信。也可以說數(shù)據(jù)公路是分散控制系統(tǒng)DCS的脊柱。由于它的任務(wù)是為系統(tǒng)所有部件之間提供通信網(wǎng)絡(luò)，因此，數(shù)據(jù)公路自身的設(shè)計就決定了總體的靈活性和安全性。數(shù)據(jù)公路的媒體可以是：一對絞線、同軸電纜或光纖電纜。
通過數(shù)據(jù)公路的設(shè)計參數(shù)，基本上可以了解一個特定DCS系統(tǒng)的相對優(yōu)點與弱點。
（1）系統(tǒng)能處理多少I/O信息。
（2）系統(tǒng)能處理多少與控制有關(guān)的控制回路的信息。
（3）能適應(yīng)多少用戶和裝置（CRT、控制站等）。
（4）傳輸數(shù)據(jù)的完整性是怎樣徹底檢查的。
（5）數(shù)據(jù)公路的最大允許長度是多少。
（6）數(shù)據(jù)公路能支持多少支路。
（7）數(shù)據(jù)公路是否能支持由其它制造廠生產(chǎn)的硬件（可編程序控制器、計算機、數(shù)據(jù)記錄裝置等）。
為保證通信的完整，大部分DCS廠家都能提供冗余數(shù)據(jù)公路。
為了保證系統(tǒng)的安全性，使用了復(fù)雜的通信規(guī)約和檢錯技術(shù)。所謂通信規(guī)約就是一組規(guī)則，用以保證所傳輸?shù)臄?shù)據(jù)被接收，并且被理解得和發(fā)送的數(shù)據(jù)一樣。
目前在DCS系統(tǒng)中一般使用兩類通信手段，即同步的和異步的，同步通信依*一個時鐘信號來調(diào)節(jié)數(shù)據(jù)的傳輸和接收，異步網(wǎng)絡(luò)采用沒有時鐘的報告系統(tǒng)。
產(chǎn)品承諾：
保?證?全新原裝進口,
保?證?安全準時發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢價格，大量現(xiàn)貨。
主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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