工業(yè)控制系統(tǒng)是對(duì)諸如圖像、語(yǔ)音信號(hào)等大數(shù)據(jù)量、高速率傳輸?shù)囊螅执呱水?dāng)前在商業(yè)領(lǐng)域風(fēng)靡的
以太網(wǎng)與控制網(wǎng)絡(luò)的結(jié)合。這股工業(yè)控制系統(tǒng)網(wǎng)絡(luò)化浪潮又將諸如
嵌入式技術(shù)、多標(biāo)準(zhǔn)工業(yè)控制
網(wǎng)絡(luò)互聯(lián)、無(wú)線(xiàn)技術(shù)等多種當(dāng)今流行技術(shù)融合進(jìn)來(lái)，從而拓展了工業(yè)控制領(lǐng)域的發(fā)展空間，帶來(lái)新的發(fā)展機(jī)遇。
隨著
計(jì)算機(jī)技術(shù)、通信技術(shù)和控制技術(shù)的發(fā)展，傳統(tǒng)的控制領(lǐng)域正經(jīng)歷著一場(chǎng)前所未有的變革，開(kāi)始向網(wǎng)絡(luò)化方向發(fā)展。
為了克服DCS系統(tǒng)的技術(shù)瓶頸,進(jìn)一步滿(mǎn)足現(xiàn)場(chǎng)的需要,現(xiàn)場(chǎng)總線(xiàn)技術(shù)應(yīng)運(yùn)而生,它實(shí)際上是連接現(xiàn)場(chǎng)智能設(shè)備和自動(dòng)化控制設(shè)備的雙向串行、數(shù)字式、多節(jié)點(diǎn)通信網(wǎng)絡(luò),也被稱(chēng)為現(xiàn)場(chǎng)底層設(shè)備控制網(wǎng)絡(luò)（INFRANET）。和Internet、Intranet等類(lèi)型的信息網(wǎng)絡(luò)不同,控制網(wǎng)絡(luò)直接面向生產(chǎn)過(guò)程,因此要求很高的實(shí)時(shí)性、可靠性、資料完整性和可用性。為滿(mǎn)足這些特性,現(xiàn)場(chǎng)總線(xiàn)對(duì)標(biāo)準(zhǔn)的網(wǎng)絡(luò)協(xié)議作了簡(jiǎn)化,省略了一些中間層,只包括ISO/OSI7層模型中的3層：物理層、數(shù)據(jù)鏈路層和應(yīng)用層。
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