描述

1C31234G01

現(xiàn)場(chǎng)總線技術(shù)是在80年代后期發(fā)展起來的一種先進(jìn)的現(xiàn)場(chǎng)工業(yè)控制技術(shù)，它綜合了數(shù)字通信技術(shù)、計(jì)算機(jī)技術(shù)、自動(dòng)控制技術(shù)、網(wǎng)絡(luò)技術(shù)和智能儀表等多種技術(shù)手段，從根本上突破了傳統(tǒng)的“點(diǎn)對(duì)點(diǎn)”式的模擬信號(hào)或數(shù)字一模擬信號(hào)控制的局限性，構(gòu)成一種全分散、全數(shù)字化、智能、雙向、互連、多變量、多接點(diǎn)的通信與控制系統(tǒng)?，F(xiàn)場(chǎng)總線則是連接智能現(xiàn)場(chǎng)設(shè)備和自動(dòng)化系統(tǒng)的數(shù)字式、雙向傳輸、多分支結(jié)構(gòu)的通信網(wǎng)絡(luò)，其基礎(chǔ)是智能儀表。分散在各個(gè)工業(yè)現(xiàn)場(chǎng)的智能儀表通過數(shù)字現(xiàn)場(chǎng)總線連為一體，并與控制室中的控制器和監(jiān)視器一起共同構(gòu)成現(xiàn)場(chǎng)總線控制系統(tǒng)（Fieldbus Control System，F(xiàn)CS）。通過遵循一定的國(guó)際標(biāo)準(zhǔn)，可以將不同廠商的現(xiàn)場(chǎng)總線產(chǎn)品集成在同一套FCS中，具有互換性和互操作性。FCS把傳統(tǒng)DCS的控制功能進(jìn)一步下放到現(xiàn)場(chǎng)智能儀表，由現(xiàn)場(chǎng)智能儀表完成數(shù)據(jù)采集、數(shù)據(jù)處理、控制運(yùn)算和數(shù)據(jù)輸出等功能?，F(xiàn)場(chǎng)儀表的數(shù)據(jù)（包括采集的數(shù)據(jù)和診斷數(shù)據(jù)）通過現(xiàn)場(chǎng)總線傳到控制室的控制設(shè)備上，控制室的控制設(shè)備用來監(jiān)視各個(gè)現(xiàn)場(chǎng)儀表的運(yùn)行狀態(tài)，保存各智能儀表上傳的數(shù)據(jù)，同時(shí)完成少量現(xiàn)場(chǎng)儀表無法完成的高級(jí)控制功能。另外，F(xiàn)CS還可通過網(wǎng)關(guān)和企業(yè)的上級(jí)管理網(wǎng)絡(luò)相連，以便企業(yè)管理者掌握第一手資料，為決策提供依據(jù)。所以現(xiàn)場(chǎng)總線具有以下突出特點(diǎn)

系統(tǒng)結(jié)構(gòu)的高度分散性現(xiàn)場(chǎng)設(shè)備本身屬于智能化設(shè)備，具有獨(dú)立自動(dòng)控制的基本功能，從而從根本上改變了DCS的集中與分散相結(jié)合的體系結(jié)構(gòu)，形成了一種全新的分布式控制系統(tǒng)，實(shí)現(xiàn)了控制功能的徹底分散，提高了控制系統(tǒng)的可靠性，簡(jiǎn)化了控制系統(tǒng)的結(jié)構(gòu)。現(xiàn)場(chǎng)總線與上一級(jí)網(wǎng)絡(luò)斷開后仍可維持底層設(shè)備的獨(dú)立正常運(yùn)行，其智能程度大大加強(qiáng)?，F(xiàn)場(chǎng)設(shè)備的高度智能化
傳統(tǒng)的DCS使用相對(duì)集中的控制站，其控制站由CPU單元和輸入/輸出單元等組成?，F(xiàn)場(chǎng)總線控制系統(tǒng)則將DCS的控制站功能徹底分散到現(xiàn)場(chǎng)控制設(shè)備，僅靠現(xiàn)場(chǎng)總線設(shè)備就可以實(shí)現(xiàn)自動(dòng)控制的基本功能，如數(shù)據(jù)采集與補(bǔ)償、PID運(yùn)算和控制、設(shè)備自校驗(yàn)和自診斷等功能。系統(tǒng)的操作員可以在控制室實(shí)現(xiàn)遠(yuǎn)程監(jiān)控，設(shè)定或調(diào)整現(xiàn)場(chǎng)設(shè)備的運(yùn)行參數(shù)，還能借助現(xiàn)場(chǎng)設(shè)備的自診斷功能對(duì)故障進(jìn)行定位和診斷。

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