描述
crs-10-MB
控制類產(chǎn)品名目繁多，各家叫法不一。通常使用的控制類產(chǎn)品包括DCS、PLC兩大類。我們又將DCS的概念拓展到FCS。DCS（Distributed Contorl System）,集散控制系統(tǒng)，又稱分布式控制系統(tǒng)，是相對于集中式控制系統(tǒng)而言的一種計算機控制系統(tǒng)，它是在集中式控制系統(tǒng)的基礎(chǔ)上發(fā)展、演變而來的。FCS（FieldBus Contorl Syestem），現(xiàn)場總線控制系統(tǒng)。它是用現(xiàn)場總線這一開放的、具有互操作性的網(wǎng)絡(luò)將現(xiàn)場各個控制器和儀表及儀表設(shè)備互聯(lián)，構(gòu)成現(xiàn)場總線控制系統(tǒng)，同時控制功能徹底下放到現(xiàn)場，降低了安裝成本和維修費用。PLC（Program Logic Control ）,可編程邏輯控制器。
FCS是由DCS與PLC發(fā)展而來，不僅具備DCS與PLC的特點，而且跨出了革命性的一步。目前新型的DCS與新型的PLC，都有向?qū)Ψ娇繑n的趨勢。新型的DCS已有很強的順序控制功能;而新型的PLC，在處理閉環(huán)控制方面也不差，并且兩者都能組成大型網(wǎng)絡(luò)，DCS與PLC的適用范圍，已有很大的交叉。
DCS系統(tǒng)的關(guān)鍵是通信。也可以說數(shù)據(jù)總線是分散控制系統(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)總線自身的設(shè)計就決定了總體的靈活性和安全性。數(shù)據(jù)總線的媒體可以是:一對絞線、同軸電纜或光纖電纜。通過數(shù)據(jù)總線的設(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。
為保證通信的完整，大部分DCS廠家都能提供冗余數(shù)據(jù)總線。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，同步通信依靠一個時鐘信號來調(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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專業(yè)銷售進口DCS? PLC系統(tǒng)備件模塊
PLC模塊，可編程控制器，CPU模塊，IO模塊，AI模塊，通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅
15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實力庫存商家
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