IC660EBA025
IC660EBA025
IC660EBA025
IC660EBA025
(3) 雙向傳輸:傳統(tǒng)的4-20mA電流信號(hào)，一條線只能傳遞一路信號(hào)�，F(xiàn)場(chǎng)總線設(shè)備則在一條線上既可以向上傳遞傳感器信號(hào)，也可以向下傳遞控制信息。
(4) 自診斷:現(xiàn)場(chǎng)總線儀表本身具有自診斷功能，而且這種診斷信息可以送到中央控制室，以便于維護(hù)。
(5) 節(jié)省布線及控制室空間:在FCS中多臺(tái)現(xiàn)場(chǎng)設(shè)備可串行連接在一條總線上，這樣只需極少的線進(jìn)入中央控制室，大量節(jié)省了布線費(fèi)用，同時(shí)也降低了中央控制室的造價(jià)。
(6) 多功能儀表:可在一個(gè)儀表中集成多種功能，做成多變量變送器，集檢測(cè)、運(yùn)算、控制于一體。
(7) 開(kāi)放性與互操作性:現(xiàn)場(chǎng)總線標(biāo)準(zhǔn)保證不同廠家的產(chǎn)品可以互操作，這樣就可以在一個(gè)企業(yè)中由用戶根據(jù)產(chǎn)品的性能、價(jià)格選用不同廠商的產(chǎn)品集成在一起，避免了傳統(tǒng)控制系統(tǒng)中必須選用同一廠家的產(chǎn)品限制，促進(jìn)了有效的競(jìng)爭(zhēng)，降低了控制系統(tǒng)的成本。
(8) 智能化與自治性:現(xiàn)場(chǎng)總線設(shè)備能處理各種參數(shù)、運(yùn)行狀態(tài)信息及故障信息，具有很高的智能化，能在部件、甚至網(wǎng)絡(luò)故障的情況下獨(dú)立工
作，大大提高了整個(gè)控制系統(tǒng)的可靠性和容錯(cuò)能力。
2.2.2 IEC61158國(guó)際標(biāo)準(zhǔn)規(guī)定的幾種常見(jiàn)總線及適用領(lǐng)域：
(1)基金會(huì)現(xiàn)場(chǎng)總線，即Foundation Fieldbus,簡(jiǎn)稱FF。其前身是以美國(guó)Fisher-Rosemount公司為首，聯(lián)合Foxboro、YOKOGAWA、ABB、SIEMENS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WordFIP協(xié)議。FF總線是針對(duì)過(guò)程自動(dòng)化而設(shè)計(jì)，它是通過(guò)數(shù)字、串行、雙向的通信方法來(lái)連接現(xiàn)場(chǎng)裝置的。
基金會(huì)總線分低速H1和高速H2兩種通信速率。H1的傳輸速率為31.2kbps,通信距離可達(dá)1900m（可加中繼器延長(zhǎng)），可支持總線供電，支持本質(zhì)安全防爆環(huán)境。H2的傳輸速率為1Mbps和2.5Mbps兩種，其通信距離為750m和500m。
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