描述

MS-NAE5510-2

由于現(xiàn)場總線的以上特點，特別是其系統(tǒng)結(jié)構(gòu)的簡化，使其從設(shè)計、安裝、投運到正常生產(chǎn)運行及檢修維護(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)省了安裝費用，而且系統(tǒng)的維護(hù)開銷也大大地降低?，F(xiàn)場總線控制系統(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。FCS使用統(tǒng)一的組態(tài)方式，安裝、運行、維修簡便；利用智能化現(xiàn)場儀表，使維修預(yù)報（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，可以自由選擇替換的設(shè)備，保障用戶的高度系統(tǒng)集成主動權(quán)。此外，它還具有設(shè)計簡單，易于重構(gòu)等特點。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。但是，在實際應(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，危險仍然相對集中；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)場總線技術(shù)，開發(fā)FCS系統(tǒng)的目標(biāo)是針對現(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。FCS由于采用了現(xiàn)場總線技術(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。

（1）由于現(xiàn)場總線標(biāo)準(zhǔn)本身尚在發(fā)展中，從而給產(chǎn)品的開發(fā)和測試帶來難度。這在一定程度上造成產(chǎn)品開發(fā)商、生產(chǎn)商少，產(chǎn)品品種單一而且價格昂貴。

（2）在某些場合中，F(xiàn)CS還無法提供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，品種也不夠齊全；用現(xiàn)場儀表還只能組成一般的控制回路如單回路、串級、比例控制等，對于復(fù)雜的、先進(jìn)的控制算法還無法在儀表中實現(xiàn)，對于單回路內(nèi)有多輸入、多輸出的情況缺乏好的解決方案。

（3）目前FCS成功的應(yīng)用實例不多，難以評估實際應(yīng)用效果。由于以上這些原因，F(xiàn)CS取代DCS將是一個逐漸的過程。在這一過程中，會出現(xiàn)一些過渡型的系統(tǒng)結(jié)構(gòu)，如在DCS中以FCS取代DCS中的某些子系統(tǒng)。用戶將現(xiàn)場總線設(shè)備連接到獨立的現(xiàn)場總線網(wǎng)絡(luò)服務(wù)器，服務(wù)器配有DCS中連接操作站的上層網(wǎng)絡(luò)接口，與操作站直接通信。在DCS的軟件系統(tǒng)中可增添相應(yīng)的通信與管理軟件。這樣不需要對原有控制系統(tǒng)作結(jié)構(gòu)上的重大變動。

產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)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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