描述
HIMA F3330
集中式數(shù)字控制系統(tǒng)于七八十年代占主導(dǎo)地位。采用單片機(jī)、PLC、SLC或微機(jī)作為控制器,控制器內(nèi)部傳輸?shù)氖菙?shù)字信 號(hào),因此克服了模擬儀表控制系統(tǒng)中模擬信號(hào)精度低的缺陷,提高了系統(tǒng)的抗干擾能力。集中式數(shù)字控制系統(tǒng)的優(yōu)點(diǎn)是易于根據(jù)全局情況進(jìn)行控制計(jì)算和判斷,在控制方式、控制機(jī)時(shí)的選擇上可以統(tǒng)一調(diào)度和安排;不足的是,對(duì)控制器本身要求很高,必須具有足夠的處理能力和極高的可靠性,當(dāng)系統(tǒng)任務(wù)增加時(shí),控制器的效率和可靠性將急劇下降。集散控制系統(tǒng)(DCS)于八、九十年代占主導(dǎo)地位。其核心思想是集中管理、分散控制,即管理與控制相分離,上位機(jī)用于集中監(jiān)視管理功能,若干臺(tái)下位機(jī)下放分散到現(xiàn)場(chǎng)實(shí)現(xiàn)分布式控制,各上下位機(jī)之間用控制網(wǎng)絡(luò)互連以實(shí)現(xiàn)相互之間的信息傳遞。因此,這種分布式的控制系統(tǒng)體系結(jié)構(gòu)有力地克服了集中式數(shù)字控制系統(tǒng)中對(duì)控制器處理能力和可靠性要求高的缺陷。在集散控制系統(tǒng)中,分布式控制思想的實(shí)現(xiàn)正是得益于網(wǎng)絡(luò)技術(shù)的發(fā)展和應(yīng)用,遺憾的是,不同的DCS廠家為達(dá)到壟斷經(jīng)營(yíng) 的目的而對(duì)其控制通訊網(wǎng)絡(luò)采用各自專用的封閉形式,不同廠家的DCS系統(tǒng)之間以及DCS與上層Intranet、Internet信息網(wǎng)絡(luò)之間難以實(shí)現(xiàn)網(wǎng)絡(luò)互連和信息共享,因此集散控制系統(tǒng)從該角度而言實(shí)質(zhì)是一種封閉專用的、不具可互操作性的分布式控制系統(tǒng)且DCS造價(jià)昂貴。在這種情況下,用戶對(duì)網(wǎng)絡(luò)控制系統(tǒng)提出了開(kāi)放化和降低成本的迫切要求。FCS正是順應(yīng)以上潮流而誕生,它用現(xiàn)場(chǎng)總線這一開(kāi)放的,具有可互操作的網(wǎng)絡(luò)將現(xiàn)場(chǎng)各控制器及儀表設(shè)備互連,構(gòu)成現(xiàn)場(chǎng)總線控制系統(tǒng),同時(shí)控制功能徹底下放到現(xiàn)場(chǎng),降低了安裝成本和維護(hù)費(fèi)用。因此,F(xiàn)CS實(shí)質(zhì)是 一種開(kāi)放的、具可互操作性的、徹底分散的分布式控制系統(tǒng),有望成為21世紀(jì)控制系統(tǒng)的主流產(chǎn)品?,F(xiàn)場(chǎng)總線是將自動(dòng)化最底層的現(xiàn)場(chǎng)控制器和現(xiàn)場(chǎng)智能儀表設(shè)備互連的實(shí)時(shí)控制通訊網(wǎng)絡(luò),遵循ISO的OSI開(kāi)放系統(tǒng)互連參考模型的全部或部分通訊協(xié)議。FCS則是用開(kāi)放的現(xiàn)場(chǎng)總線控制通訊網(wǎng)絡(luò)將自動(dòng)化最底層的現(xiàn)場(chǎng)控制器和現(xiàn)場(chǎng)智能儀表設(shè)備互連的實(shí)時(shí)網(wǎng)絡(luò)控制系統(tǒng)
產(chǎn)品承諾:
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢(shì)價(jià)格,大量現(xiàn)貨。
主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
品牌:ABB???,AB??,GE,FOXBORO,本特利,英維思,伍德沃德,西屋,瑞恩,施耐德,西門子,摩托羅拉,安川。力士樂(lè)。ACSO,橫河等進(jìn)口品牌。 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA ? 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊 15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國(guó)內(nèi)實(shí)力庫(kù)存商家
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專業(yè)銷售進(jìn)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(guó)內(nèi)實(shí)力庫(kù)存商家