描述

基金會(huì)現(xiàn)場(chǎng)總線FF是在過程自動(dòng)化領(lǐng)域得到廣泛支持和具有良好發(fā)展前景的一種技術(shù)。其前身是以美國(guó)Fisher－Rosemount公司為首，聯(lián)合Foxboro、橫河、ABB、西門子等80家公司制定的ISP協(xié)議和以Honeywell公司為首，聯(lián)合歐洲等地150家公司制定的World

FIP協(xié)議。這兩大集團(tuán)于1994年9月合并，成立了現(xiàn)場(chǎng)總線基金會(huì)，致力于開發(fā)出國(guó)際上統(tǒng)一的現(xiàn)場(chǎng)總線協(xié)議。

基金會(huì)現(xiàn)場(chǎng)總線分為H1和高速H2兩種通信速率。H1的傳輸速率為31.25Kbps，通信距離可達(dá)1.9km，可支持總線供電和本質(zhì)安全防暴環(huán)境。H2的傳輸速率可為1Mbps和2.5Mbps兩種，通信距離為750m和500m。物理傳輸介質(zhì)可為雙絞線、光纜和無(wú)線，其傳輸信號(hào)采用曼切斯特編碼?；饡?huì)現(xiàn)場(chǎng)總線以ISO/OSI開放系統(tǒng)互連模型為基礎(chǔ)，取其物理層、數(shù)據(jù)鏈路層、應(yīng)用層為FF通信模型的相應(yīng)層次，并在應(yīng)用層上增加了用戶層。用戶層主要針對(duì)自動(dòng)化測(cè)控應(yīng)用的需要，定義了信息存取的統(tǒng)一規(guī)則，采用設(shè)備描述語(yǔ)言規(guī)定了通用的功能塊集。FF總線包括FF通信協(xié)議、ISO模型中的2～7層通信協(xié)議的通棧、用于描述設(shè)備特性及操作接口的DDL設(shè)備描述語(yǔ)言、設(shè)備描述字典，用于實(shí)現(xiàn)測(cè)量、控制、工程量轉(zhuǎn)換的應(yīng)用功能塊，實(shí)現(xiàn)系統(tǒng)組態(tài)管理功能的系統(tǒng)軟件技術(shù)以及構(gòu)筑集成自動(dòng)化系統(tǒng)、網(wǎng)絡(luò)系統(tǒng)的系統(tǒng)集成技術(shù)。

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