描述
FOXBORO-P0914ZM
由于現(xiàn)場(chǎng)總線的以上特點(diǎn),特別是其系統(tǒng)結(jié)構(gòu)的簡(jiǎn)化,使其從設(shè)計(jì)、安裝、投運(yùn)到正常生產(chǎn)運(yùn)行及檢修維護(hù),都體現(xiàn)出優(yōu)越性。它不僅節(jié)省了硬件數(shù)量與投資,節(jié)省了安裝費(fèi)用,而且系統(tǒng)的維護(hù)開銷也大大地降低?,F(xiàn)場(chǎng)總線控制系統(tǒng)不僅精確度與可靠性高,在方便使用和維護(hù)性方面,F(xiàn)CS也比DCS有優(yōu)勢(shì)。FCS使用統(tǒng)一的組態(tài)方式,安裝、運(yùn)行、維修簡(jiǎn)便;利用智能化現(xiàn)場(chǎng)儀表,使維修預(yù)報(bào)(Predicted maintenance)成為可能;由于系統(tǒng)具有互操作性和互用性,用戶可以自由選擇不同品牌的設(shè)備達(dá)到最佳的系統(tǒng)集成,在設(shè)備出現(xiàn)故障時(shí),可以自由選擇替換的設(shè)備,保障用戶的高度系統(tǒng)集成主動(dòng)權(quán)。此外,它還具有設(shè)計(jì)簡(jiǎn)單,易于重構(gòu)等特點(diǎn)。傳統(tǒng)的集散控制系統(tǒng)(DCS系統(tǒng))具有集中監(jiān)控、分散控制、操作方便的特點(diǎn)。但是,在實(shí)際應(yīng)用中也發(fā)現(xiàn)DCS的結(jié)構(gòu)存在一些不足之處,如控制不能做到徹底分散,危險(xiǎn)仍然相對(duì)集中;由于系統(tǒng)的不開放性,不同廠家的產(chǎn)品不能互換、互聯(lián),限制了用戶的選擇范圍。利用現(xiàn)場(chǎng)總線技術(shù),開發(fā)FCS系統(tǒng)的目標(biāo)是針對(duì)現(xiàn)存的DCS的某些不足,改進(jìn)控制系統(tǒng)的結(jié)構(gòu),提高其性能和通用性。
FCS想要在實(shí)際中取代DCS,既要具備DCS所具有的功能,又要能克服DCS的缺點(diǎn)。FCS由于采用了現(xiàn)場(chǎng)總線技術(shù),在開放性、控制分散等方面優(yōu)于傳統(tǒng)DCS。但是由于它是一種新技術(shù),目前連標(biāo)準(zhǔn)本身都還沒有制定統(tǒng)一,因此FCS與成熟的DCS相比,還存在下列的一些欠缺。由于現(xiàn)場(chǎng)總線標(biāo)準(zhǔn)本身尚在發(fā)展中,從而給產(chǎn)品的開發(fā)和測(cè)試帶來(lái)難度。這在一定程度上造成產(chǎn)品開發(fā)商、生產(chǎn)商少,產(chǎn)品品種單一而且價(jià)格昂貴。
在某些場(chǎng)合中,F(xiàn)CS還無(wú)法提供DCS已有的控制功能。由于軟硬件水平的限制,其功能塊的功能還不是很強(qiáng),品種也不夠齊全;用現(xiàn)場(chǎng)儀表還只能組成一般的控制回路如單回路、串級(jí)、比例控制等,對(duì)于復(fù)雜的、先進(jìn)的控制算法還無(wú)法在儀表中實(shí)現(xiàn),對(duì)于單回路內(nèi)有多輸入、多輸出的情況缺乏好的解決方案。
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
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