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    500-5031
    發布者:工控備件  發布時間:2019-08-19 14:46:08  訪問次數:91

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    500-5031


    DCS系統在工業生產過程的廣泛應用,使可靠性、穩定性問題更加突出,也使人們對整個系統要求越來越高。人們希望DCS系統盡量少出故障,又希望DCS系統一旦出現故障,能盡快診斷出故障部位,并盡快修復,使系統重新工作。下面簡單介紹故障大體分類及故障診斷的一般方法。
      一、DCS系統故障的分類
      為了便于分析、診斷DCS系統故障發生的部位和產生原因,可以把故障大致分為如下幾類。
      1、現場儀表設備故障
      現場儀表設備包括與生產過程直接聯系的各種變送器、各種開關、執行機構、負載等,F場儀表設備發生故障,直接影響DCS系統的控制功能。在目前的DCS控制系統中,這類故障占絕大部分。這類故障一般是由于儀表設備本身的質量和壽命所致。
      2、系統故障
      這是影響系統運行的全局性故障。系統故障可分為固定性故障和偶然性故障。這類故障一般比較明顯且影響也是局部的,它們主要是由使用不當或使用時間較長,模板內元件老化所致。
      3、硬件故障
      這類故障主要指DCS系統中的模板(特別是I/O模板)損壞造成的故障。這類故障一般比較明顯且影響也是局部的,它們主要是由使用不當或使用時間較長,模板內元件老化所致。
      4、軟件故障
      這類故障是軟件本身所包含的錯誤所引起的,軟件故障又可分為系統軟件故障和應用軟件故障。系統軟件是DCS系統帶來的,若設計考慮不周,在執行中一旦條件滿足就會引發故障,造成停機或死機等現象。此類故障并不常見。應用軟件是用戶自己編定的。在實際工程應用中,由于應用軟件工作復雜,工作量大,因此軟件錯誤幾乎難以避免,這就要求在DCS系統調試及試運行中十分認真,及時發現并解決。
      5、操作、使用不當造成故障
      在實際運行操作中,有時會出現DCS系統某功能不能使用或某控制不封不能正常工作,但實際上DCS系統并沒有毛病,而是操作人員操作不熟練或操作錯誤所引起的。這對于初次使用DCS系統的操作工較為常見。

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