1756-IF16產(chǎn)品說明:
1756-IF16
廈門卡庫電氣有限公司
聯(lián)系人:嚴小姐
手機:18030229052
電話:0592-5709823
傳真:0592-5709828
Q Q :1093230189
地址;廈門湖里區(qū)枋湖西一里22號1302室
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廈門卡庫產(chǎn)品均為原廠生產(chǎn)進口產(chǎn)品,相關事項詳詢嚴小姐為您解答.
卡庫作為一家全球性的貿(mào)易公司,所售的產(chǎn)品質保期均為1年,出庫前經(jīng)過專業(yè)檢測。
我們有大量庫存和高品質,停產(chǎn)控制系統(tǒng)部件ABB Advant OCS,ABBMOD 300,ABB Procontic,ABB Procontrol,H&B Contronic,Moore APACSand QUADLOG Moore Panel Controllers,RosemountRS-3備品 備件卡件,伺服,品牌包括英維斯 AB ABB GE 施耐德 ??怂共_ 霍尼韋爾 西門子力士樂等進口模塊卡件,歡迎詢價,目前隨時可以配貨。
本系統(tǒng)由作為上位機的計算機、無線數(shù)據(jù)傳輸模塊、天線、各種傳感器、和作為下位機的PLC構成上位機鏈接系統(tǒng)。上位機提供良好的人機界面,對全網(wǎng)進行監(jiān)控和管理;下位機直接參與現(xiàn)場控制,通過各種傳感器采集實時參數(shù)以及發(fā)出控制命令。上位機和下位機之間通過無線數(shù)據(jù)傳輸設備進行無線通信。其硬件結構如圖1。 系統(tǒng)選用的PLC型號為C200HE_CPU42,內置上位機鏈接單元,安裝了數(shù)字量信號輸入單元ID212,數(shù)字量信號輸出單元OC224,模擬量信號輸入單元AD003和溫度傳感器單元TS102。 2.1 特殊I/O單元 特殊I/O單元AD003和TS102需要進行單元號的設置,以確定每一路模擬量輸入所占用的IR和DM區(qū)域。本系統(tǒng)中,模擬量輸入為9路,故需要兩個AD-003模塊,將其對應的單元號分別設為0和1,即分別分配給它們IR100~IR109和DM1000~DM1099,IR110~IR119和DM1100~DM1199。溫度輸入為2路,故選要一個TS102模塊,單元號設為2,分配給它IR100~IR109和DM1000~DM1099。 2.2 無線數(shù)據(jù)傳輸模塊 本系統(tǒng)采用無線數(shù)據(jù)傳輸模塊SA68D作為計算機與可編程序控制器的數(shù)據(jù)傳輸媒介。計算機(或PLC)和模塊之間的通信是通過RS-232異步串口來完成的,該模塊在本系統(tǒng)中只作數(shù)據(jù)傳輸使用,它與計算機和PLC接線為簡單的三線連接即可。 在本系統(tǒng)中,模塊以廣播的方式發(fā)送信息,而通過PLC上位機鏈接的幀格式中的節(jié)點號來判斷接收方和發(fā)送方。對于節(jié)點號不符的信息,將由PLC拒絕接收。 3 上位機鏈接通信 上位機鏈接通信用來在PLC和上位機之間傳送數(shù)據(jù),使得上位機可以使用上位機鏈接命令監(jiān)視PLC的運行狀態(tài)和數(shù)據(jù)區(qū)的內容。還可以使用TXD(—)指令將PLC數(shù)據(jù)區(qū)的數(shù)據(jù)傳送到上位機。 上位機鏈接通信是一種主從總線通信方式,以上位機作為工業(yè)局域網(wǎng)通信的主站,其它所有連入該網(wǎng)的PLC皆為從站。在本系統(tǒng)中,上位計算機監(jiān)控各換熱站工作,各站獨立運行,彼此之間無數(shù)據(jù)交換,故在數(shù)據(jù)傳送方式上屬主從通信。 在主站與某一從站建立起聯(lián)系后,采用有應答方式進行通信,主站以命令幀形式發(fā)出命令,從站用響應幀應答。在命令幀或響應幀中包含著需要通信的數(shù)據(jù),通過命令幀與響應幀的應答,就能使要交換的數(shù)據(jù)順利到達對方。 下面介紹命令幀與響應幀格式。 命令幀格式: 響應幀格式:
FCS校驗碼用于檢查傳送時是否存在數(shù)據(jù)錯誤。結束碼表示命令完成的狀態(tài),若PLC正確執(zhí)行了上位機下達的命令,則結束碼為00;若發(fā)生了錯誤,結束碼為非0。 4 系統(tǒng)軟件設計 本系統(tǒng)主要采用上位機輪詢方式進行通信,這種方式,一方面可避免通信總線發(fā)生數(shù)據(jù)沖突,另一方面可確保定時刷新監(jiān)控主機中各PLC分機的實時數(shù)據(jù)。而對于PLC主動發(fā)出的報警信息,上位機采用中斷的方式實現(xiàn)通信。 上位機首先向PLC發(fā)出接收數(shù)據(jù)的指令,PLC接收到來自上位機的指令后,進行判斷,看其是否正確,如果正確,則向上位機傳送數(shù)據(jù)(包含首尾校驗字節(jié));否則,PLC拒絕向上位機傳送數(shù)據(jù)。上位機接收到PLC傳來的數(shù)據(jù)后也要進行判斷正確與否,如果正確,則接收,否則拒絕接收。
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