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1、現(xiàn)場(chǎng)總線對(duì)傳統(tǒng)dcs的沖擊
　　R88D-UA04V現(xiàn)場(chǎng)總線對(duì)傳統(tǒng)dcs的沖擊來(lái)源于其本質(zhì)上優(yōu)越于dcs系統(tǒng)的技術(shù)特征。根據(jù)國(guó)際電工委員會(huì)IEC和現(xiàn)場(chǎng)總線基金會(huì)FF的定義，現(xiàn)場(chǎng)總線技術(shù)具有以下5個(gè)主要特點(diǎn)：
　?、贁?shù)字信號(hào)完全取代4-20mA模擬信號(hào)；
　?、谑够具^(guò)程控制、報(bào)警和計(jì)算功能等完全分布在現(xiàn)場(chǎng)完成；
　?、凼乖O(shè)備增加非控制信息，如自診斷信息、組態(tài)信息以及補(bǔ)償信息等；
　　④實(shí)現(xiàn)現(xiàn)場(chǎng)管理和控制的統(tǒng)一；
　?、菡嬲龑?shí)現(xiàn)系統(tǒng)開(kāi)放性、互操作性。
　　R88D-UA04V現(xiàn)場(chǎng)總線技術(shù)不僅是一種通信技術(shù)，它實(shí)際上融人了智能化儀表、計(jì)算機(jī)網(wǎng)絡(luò)和開(kāi)放系統(tǒng)互連(OSI)等技術(shù)的精粹。所有這些特點(diǎn)使得以現(xiàn)場(chǎng)總線技術(shù)為基礎(chǔ)的現(xiàn)場(chǎng)總線控制系統(tǒng)(FCS)相對(duì)于傳統(tǒng)dcs系統(tǒng)具有巨大的優(yōu)越性：
　　①系統(tǒng)結(jié)構(gòu)大大簡(jiǎn)化，成本顯著降低；
　　②現(xiàn)場(chǎng)設(shè)備自治性加強(qiáng)，系統(tǒng)性能全面提高；
　?、厶岣吡诵盘?hào)傳輸?shù)目煽啃院途龋?br /> 　?、躌88D-UA04V真正實(shí)現(xiàn)全分散、全數(shù)字化的控制網(wǎng)絡(luò)；
　?、萦脩羰冀K擁有系統(tǒng)集成權(quán)。
　　這些優(yōu)越性可從dcs和現(xiàn)場(chǎng)總線系統(tǒng)的網(wǎng)絡(luò)結(jié)構(gòu)比較后得到驗(yàn)證。

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