VERTEQ 1020122.022

VERTEQ 1020122.022

廈門興銳達自動化設(shè)備有限公司 http://www.xrdzidonghua.com

VERTEQ 1020122.022控制網(wǎng)絡負荷分析?？刂凭W(wǎng)絡采用profibus-dp協(xié)議，prof ibus-dp采用輪巡的傳輸協(xié)議，假設(shè)一個系統(tǒng)有n個dp設(shè)備，通訊時系統(tǒng)主站首先對#1從站(#1dp設(shè)備)發(fā)出一個請求，#1從站根據(jù)請求返回數(shù)據(jù)，接著主站對#2從站發(fā)出一個請求，#2從站根據(jù)請求返回數(shù)據(jù)……，主站對#n從站發(fā)出一個請求，#n從站根據(jù)請求返回數(shù)據(jù)，主站對#1從站(#1dp設(shè)備)發(fā)出一個請求，#1從站根據(jù)請求返回數(shù)據(jù)……。系統(tǒng)一直不停的輪巡所有設(shè)備。
　　我們考慮系統(tǒng)輪巡一遍設(shè)備所用的時間，系統(tǒng)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(jié)數(shù)1500000÷8=187500 byte字節(jié)
　　按現(xiàn)場控制站的應用軟件通訊協(xié)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(shù)據(jù)16位，crc校驗1位)byte，開關(guān)量模件的幀為6(頭3位，數(shù)據(jù)2位，crc校驗1位)byte，而每個現(xiàn)場控制站的dp主卡的雙口ram包括輸入3584 byte、輸出3584byte，每個現(xiàn)場控制站理論上可以帶125個dp模塊，主站與從站的握手協(xié)議包括診斷不大于20 byte。

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