VERTEQ 1020122.022
VERTEQ 1020122.022
廈門興銳達自動化設備有限公司 http://www.xrdzidonghua.com
VERTEQ 1020122.022控制網絡負荷分析。控制網絡采用profibus-dp協議,prof ibus-dp采用輪巡的傳輸協議,假設一個系統有n個dp設備,通訊時系統主站首先對#1從站(#1dp設備)發出一個請求,#1從站根據請求返回數據,接著主站對#2從站發出一個請求,#2從站根據請求返回數據……,主站對#n從站發出一個請求,#n從站根據請求返回數據,主站對#1從站(#1dp設備)發出一個請求,#1從站根據請求返回數據……。系統一直不停的輪巡所有設備。我們考慮系統輪巡一遍設備所用的時間,系統可配置成八種通訊速率,我們按照1.5mbps進行分析:
每秒鐘通訊字節數1500000÷8=187500 byte字節
按現場控制站的應用軟件通訊協議,查詢幀為4個byte,模擬量模件、脈沖量模件的幀為20(頭3位,數據16位,crc校驗1位)byte,開關量模件的幀為6(頭3位,數據2位,crc校驗1位)byte,而每個現場控制站的dp主卡的雙口ram包括輸入3584 byte、輸出3584byte,每個現場控制站理論上可以帶125個dp模塊,主站與從站的握手協議包括診斷不大于20 byte。
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