07DC92 GJR5252200R0101
分散控制系統網絡體系結構
工廠級(上層、管理層)包括工廠信息管理和生產管理,負責與工廠管理計算機的連接,計算機間的管理數據交換通過工廠主干網實現。主干網采用ISO/OSI-MAP/TOP或TCP/IP-Ethernet網絡協議標準。隨著工廠自動化規模的不斷擴大,這一級的功能也越來越強,它是DCS 向CIPS 發展的一個重要標志。車間級(中層、監控層)包括過程控制和過程管理,用于控制室、現場控制設備和各現場控制裝置間的連接。通信網采用中速、載帶工業過程數據公路的形式(ProwayC或IEEE802.4)。這是DCS的實時工業控制網絡,應具有高可靠性、高使用性、實時性強、有自診斷功能、有自組態功能、容易接入新站等。
現場級(低層)用于連接過程控制中的傳感器、執行器、智能儀表等。現場以標準的現場總線為發展目標,現已有了兩個國際組織的現場總線產品,現場總線將是DCS 發展的一個重要方向。
2 現場總線
2.1 現場總線標準
現場總線標準的部分被命名為H1,定義了一個低速、帶電鏈路的數字信號取代4~20 mA模擬量傳輸信號。當H1被采用后,智能傳感器將能夠與數字控制系統直接通信。第二部分H2,定義了一個高速、不帶電的鏈路,使協議可應用于邏輯和控制。H2協議的通信速率為1 Mb,而H1通信速率為31.25 Kb。
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廈門仲鑫達自動化設備有限公司
歐陽英(銷售經理)
移動電話:13394057292
電話:0592-5856292
郵箱:370848070@qq
Q Q :370848070 , 2687338778
地址;廈門思明區湖濱東路湖光大廈8樓A單元
歐陽英(銷售經理)
移動電話:13394057292
電話:0592-5856292
郵箱:370848070@qq
Q Q :370848070 , 2687338778
地址;廈門思明區湖濱東路湖光大廈8樓A單元
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