9300-RADES9300-RADES
9300-RADES9300-RADES產品描述:
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追求品質——質量是企業的生命,嚴要求、高標準。
講求實效——辦事認真、踏實,不浮不夸,講求實際效果。
拼搏進取——愛拼才會贏,只有拼搏才能取的好成效。
務實創新—一切工作講實效,有了創新精神,才不會停滯不前。
以人為本——企業競爭歸根到底是人才競爭,人力資源是企業的心臟。
團隊協作——團隊是力量的匯合,志同道合、團結合作才是力量的源泉,勝利的保障。
內創品牌——企業管理的基礎是在內部在基層,練好內功,萬丈高樓始于平地。
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永續經營——企業發展要立足長遠,要積極進取,要不斷發展,才能永操勝券。
本公司主要優勢產品:
【美國,英維思 Invensys FOXBORO I\A系統, Triconex ESD系統】
【美國AB ..1756系列,1785系列,1746系列,1747系列,1771系列】
【瑞士ABB.. 機器人 DSQC系列,ABB Advant OCS,ABB Procontic PLC CPU】
【法國施耐德140*康昆騰系列處理器,內存卡,電源模塊等。】
【德國西門子Siemens MOORE,S5,S7,6DD等】
【美國通用電氣GE..IC693/IC697系列】
【美國Westinghouse(西屋):OVATION系統、WDPF系統】
【德國Bosch Rexroth(博世力士樂):Indramat,I/O模塊,PLC控制器,驅動模
塊等。】
【美國Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列】
整個系統中將計算機虛擬電梯模型和電梯控制器PLC有機連接起來的就是計算機和PLC的通訊程序。通訊協議就是定義的使計算機與PLC能夠識別相互之間通訊數據的通訊格式。本系統中S7-200與計算機間的數據傳輸,是以“幀”為單位進行的。本系統采用定長的通訊幀,每一幀的格式為:
定義:
1).開始字符標志著通訊幀的開始,在本系統中被定義為ASCII碼的"@"。
2).結束字符標志著通訊幀的結束,在本系統中被定義為ASCII碼的"#"。
3).校驗碼為正文各數據的異或和,用兩個字節的十六進制ASCII碼表示。
計算機與PLC通信時,為了避免通信中的沖突,采用主從方式,即計算機為主機,PLC為從機。只有主機才有權主動發送請求報文(或稱為請求幀),從機收到后進行校驗,若校驗正確,則返回響應報文。
4)通訊幀中的命令類型則反映主從機之間的通訊數據類型。命令類型用兩個字符格式表示,定義CT表示控制字,ST表示狀態字,RS表示響應字。對不同命令類型的通訊數據幀格式定義如下:
(1) 狀態字為計算機傳向PLC的數據,表明虛擬電梯的狀態及呼叫命令。該通訊幀數據格式為:
正文數據包括: 電梯的運行狀態(上行、下行、停),安全信號(是、否),電梯開關門,電梯內呼外呼信號,平層信號等,用十進制數字按照下列定義的順序表示:
運行方式定義為1位:自動為0,司機為1,檢修為2,消防為3;
運行狀態定義為1位: 電梯上行 為2,下行 1 ,停止為0,故障為3
電梯開關門定義為3位,*含義:按鈕未按0,電梯開門1 ,電梯關門 2 ;二、三位表示門狀態:開門過程00 ,開門到位01,關門過程10 ,關門到位11 ;
電梯內呼數據以N開始,以W結束,每兩位表示內呼層數,如N0413W表示電梯內有到4層和13層的內內呼信號;
電梯外呼數據以內呼結束字符W位開始,以字符S為結束字符。每三位表示外呼層數:*是外呼方向0為下行,1為上行,2為上下均有呼叫,另兩位表示層數。如數據W005112S則表示五層有下行呼叫,12層有上行呼叫。
平層信號用兩位表示。
正文數據為A、B兩梯的數據,其格式相同,其中A梯數據在前,B梯數據在后。
(2)響應字是計算機或PLC接收到數據后返回發送方的的響應。用于判斷通訊數據是否正確。正文包括:當異或校驗碼正確時用00表示,錯誤時用11表示。當計算機向PLC發送如前所示狀態字后,由PLC返回計算機的響應為:
(3)當計算機向PLC發送的數據格式為
表明計算機作為主機,要求PLC傳送數據,主機處于數據接收狀態,此時PLC向計算機傳送的數據幀稱為控制字,通過它來控制虛擬電梯的運行,控制字格式為
正文數據包括:電梯的上行下行停止,電梯開關門指令,信號指示(內呼、外呼、摟層)。定義格式與狀態字類似。
3 .通訊程序設計
通訊程序的設計就是要在計算機和PLC之間完成以上述協議為格式的數據傳遞任務。分為計算機通訊程序和PLC通訊程序。
3.1計算機通訊程序
在開發計算機串行通信程序時采用VB編程語言,主要是利用MSComm (Microsoft Comm Control 6.0)通信控件,該控件提供了對串口的各種操作。MSComm提供兩種通信方式,事件驅動方法和查詢法。本系統采用查詢法,查詢法適合于較小的應用程序,每當應用程序執行完某一串行口操作后,將不斷檢查MSComm控件的CommEvent屬性,以檢查執行結果或檢查某一事件是否發生。MSComm 控件主要屬性有:
(1)Commport屬性,設置并返回通信端口號,用于使用PC機的哪一個串行端口
(2)Setting屬性,以字符串的形式設置并返回波特率、奇偶校驗、數據位和停止位。
(3)Portopen屬性,設置并返回通信端口的狀態,用于打開或關閉端口。
(4)Output屬性,用于發送數據,可以是文本數據或二進制數據。
(5)Input屬性,從接收緩沖區返回和刪除字符,用于接收數據。
(6) InputLen,設置并返回每次Input屬性從接收緩沖區讀取的字符數。
(7) CommEvent,返回zui近的通訊事件或錯誤。
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