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IC660EBA025

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(3) 雙向傳輸:傳統的4-20mA電流信號，一條線只能傳遞一路信號。現場總線設備則在一條線上既可以向上傳遞傳感器信號，也可以向下傳遞控制信息。
(4) 自診斷:現場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。
(5) 節省布線及控制室空間:在FCS中多臺現場設備可串行連接在一條總線上，這樣只需極少的線進入中央控制室，大量節省了布線費用，同時也降低了中央控制室的造價。
(6) 多功能儀表:可在一個儀表中集成多種功能，做成多變量變送器，集檢測、運算、控制于一體。
(7) 開放性與互操作性:現場總線標準保證不同廠家的產品可以互操作，這樣就可以在一個企業中由用戶根據產品的性能、價格選用不同廠商的產品集成在一起，避免了傳統控制系統中必須選用同一廠家的產品限制，促進了有效的競爭，降低了控制系統的成本。
(8) 智能化與自治性:現場總線設備能處理各種參數、運行狀態信息及故障信息，具有很高的智能化，能在部件、甚至網絡故障的情況下獨立工
作，大大提高了整個控制系統的可靠性和容錯能力。

2.2.2 IEC61158國際標準規定的幾種常見總線及適用領域： 
(1)基金會現場總線，即Foundation Fieldbus,簡稱FF。其前身是以美國Fisher-Rosemount公司為首，聯合Foxboro、YOKOGAWA、ABB、SIEMENS等80家公司制定的ISP協議和以Honeywell公司為首、聯合歐洲等地150家公司制定的WordFIP協議。FF總線是針對過程自動化而設計，它是通過數字、串行、雙向的通信方法來連接現場裝置的。

基金會總線分低速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1900m（可加中繼器延長），可支持總線供電，支持本質安全防爆環境。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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