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3.1.1.7 工控指令下發
數據查詢指令不再採用“請求-應答模式”,指揮機不再發送周期性查詢命令,改為由終端主動向指揮機上報,終端按照監測等級以不同頻度更新監測數據;信道服務器依據本地緩存數據向服務器監控軟件進行實時回復。
控制指令保持“請求-應答模式”,信道服務器始終向服務器監控軟件實時回復控制指令正常回令,並通過北鬥通信鏈路下發控制指令;控制回令通過北鬥終端回復至北鬥指揮機,回復內容為與控制指令相關的數據查詢值。工控指令下發和執行狀態返回優先於現場數據獲取;
支持工控指令發送策略:點對點。控制指令由服務器監控軟件發起控制指令(指揮機->單個終端):iFix軟件對某個站點下達的控制命令,通過指揮機->單個終端的報文下達,若控制指令可以在一條報文中傳輸完畢,控制周期為30S+60S+20S。若控制指令需要N條報文進行傳輸,則控制周期為(30S+60S+20S)*N。不同站點的控制指令排隊發送。
北鬥服務上傳、下行數據通過質量戳標記表示操作成功與否。
為保證北鬥鏈路中控制數據準確及時的傳遞,對控制數據採取下列可靠性保證措施:
控制指令中增加數據校驗功能,若傳輸出現異常,丟棄當前報文,等待重傳;避免終端PLC/RTU誤動作。
控制指令採用“請求+應答”模式,若服務器端發送的請求未在有效時間內收到回復,則允許客戶端進行重發操作,保證命令能夠正常傳遞。
現場數據分優先級進行傳輸。
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