6ES75211BH000AB0
6ES75211BH000AB0
6ES75211BH000AB0
6ES75211BH000AB0
在本系統(tǒng)中S7-226主要用來與計算機通訊、數(shù)據(jù)采集、高速計數(shù)、與EM277連接作為Profibus-DP從站進行通訊、控制比例調(diào)速閥實現(xiàn)曲線控制和執(zhí)行機構(gòu)控制。
i. 現(xiàn)場傳感器的I/O信號檢測及現(xiàn)場I/O點的控制。
ii. 檢測編碼器的信號，實現(xiàn)高數(shù)計數(shù)用來控制傳卷車的精確定位。
iii. 作為Profibus-DP從站，與主站通信，用來接受主站的控制要求和鋼卷重量數(shù)據(jù)，并通過主站控制變頻器用以控制入口傳卷車的行走方向和運轉(zhuǎn)速度。
iv. 利用RS485與計算機通訊，將稱重數(shù)據(jù)實時傳輸?shù)缴衔粰C中。
v. 實現(xiàn)比例調(diào)速閥的曲線控制，控制步進梁的緩起緩?fù)：途_到位。
三、軟件編程
PLC的軟件共分為8個模塊，分別為主程序塊、系統(tǒng)復(fù)位程序、數(shù)據(jù)傳輸程序、傳卷車控制程序、步進梁狀態(tài)檢測程序、步進梁手動控制程序、步進梁自動啟動程序、比例閥曲線控制函數(shù)程序。
i. 主程序塊實現(xiàn)各個功能模塊程序的滿足條件時候調(diào)用，并通過RS485通訊實時向上位計算機中傳送鋼卷的重量信息數(shù)據(jù)。
ii. 系統(tǒng)復(fù)位程序主要在系統(tǒng)啟動時候設(shè)置高數(shù)計數(shù)的模式選擇和與上位機通訊端口的模式設(shè)置。
iii. 數(shù)據(jù)傳輸程序主要將S7-200的各個控制點和設(shè)備的狀態(tài)數(shù)據(jù)傳輸?shù)絇rofibus-DP主站中，用于Wincc畫面中的狀態(tài)顯示和故障診斷。并且接受由主站傳輸過來的控制信號和電子秤的實時重量數(shù)據(jù)。
iv. 傳卷車的控制程序通過檢測編碼器的值和現(xiàn)場的定位傳感器用來實現(xiàn)傳卷車的運行控制和精確定位，定位精度為±1mm，將控制信號傳輸?shù)絇rofibus-DP主站中，通過主站控制變頻器實現(xiàn)傳卷車的緩起緩?fù)：偷轿恢苿泳_定位的控制。
v. 步進梁狀態(tài)檢測程序用于鎖定步進梁的當前運行狀態(tài)，當出現(xiàn)危險急?；蛘咭驗椴僮髡哒`操作使步進梁處于中間位置，傳感器不能檢測到信號的時候，只能復(fù)位到0位才能進行正常操作。而有了運行狀態(tài)，步進梁不需要復(fù)位到0位，也不會導(dǎo)致由于復(fù)位時候手動操作不慎可能帶來的危險。步進梁的狀態(tài)檢測數(shù)據(jù)可以用來在Wincc畫面中模擬現(xiàn)場的動態(tài)運行畫面。
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