1756-IF16產(chǎn)品說明:
1756-IF16
廈門卡庫電氣有限公司
聯(lián)系人:嚴(yán)小姐
手機(jī):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(hào)1302室
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我們有大量庫存和高品質(zhì),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(jìn)口模塊卡件,歡迎詢價(jià),目前隨時(shí)可以配貨。
本系統(tǒng)由作為上位機(jī)的計(jì)算機(jī)、無線數(shù)據(jù)傳輸模塊、天線、各種傳感器、和作為下位機(jī)的PLC構(gòu)成上位機(jī)鏈接系統(tǒng)。上位機(jī)提供良好的人機(jī)界面,對(duì)全網(wǎng)進(jìn)行監(jiān)控和管理;下位機(jī)直接參與現(xiàn)場(chǎng)控制,通過各種傳感器采集實(shí)時(shí)參數(shù)以及發(fā)出控制命令。上位機(jī)和下位機(jī)之間通過無線數(shù)據(jù)傳輸設(shè)備進(jìn)行無線通信。其硬件結(jié)構(gòu)如圖1。 系統(tǒng)選用的PLC型號(hào)為C200HE_CPU42,內(nèi)置上位機(jī)鏈接單元,安裝了數(shù)字量信號(hào)輸入單元ID212,數(shù)字量信號(hào)輸出單元OC224,模擬量信號(hào)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(jìn)行單元號(hào)的設(shè)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(gè)AD-003模塊,將其對(duì)應(yīng)的單元號(hào)分別設(shè)為0和1,即分別分配給它們IR100~I(xiàn)R109和DM1000~DM1099,IR110~I(xiàn)R119和DM1100~DM1199。溫度輸入為2路,故選要一個(gè)TS102模塊,單元號(hào)設(shè)為2,分配給它IR100~I(xiàn)R109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(jì)算機(jī)與可編程序控制器的數(shù)據(jù)傳輸媒介。計(jì)算機(jī)(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(jì)算機(jī)和PLC接線為簡(jiǎn)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(jī)鏈接的幀格式中的節(jié)點(diǎn)號(hào)來判斷接收方和發(fā)送方。對(duì)于節(jié)點(diǎn)號(hào)不符的信息,將由PLC拒絕接收。 3 上位機(jī)鏈接通信 上位機(jī)鏈接通信用來在PLC和上位機(jī)之間傳送數(shù)據(jù),使得上位機(jī)可以使用上位機(jī)鏈接命令監(jiān)視PLC的運(yùn)行狀態(tài)和數(shù)據(jù)區(qū)的內(nèi)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(jī)。 上位機(jī)鏈接通信是一種主從總線通信方式,以上位機(jī)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(jì)算機(jī)監(jiān)控各換熱站工作,各站獨(dú)立運(yùn)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(yīng)答方式進(jìn)行通信,主站以命令幀形式發(fā)出命令,從站用響應(yīng)幀應(yīng)答。在命令幀或響應(yīng)幀中包含著需要通信的數(shù)據(jù),通過命令幀與響應(yīng)幀的應(yīng)答,就能使要交換的數(shù)據(jù)順利到達(dá)對(duì)方。 下面介紹命令幀與響應(yīng)幀格式。 命令幀格式: 響應(yīng)幀格式:
FCS校驗(yàn)碼用于檢查傳送時(shí)是否存在數(shù)據(jù)錯(cuò)誤。結(jié)束碼表示命令完成的狀態(tài),若PLC正確執(zhí)行了上位機(jī)下達(dá)的命令,則結(jié)束碼為00;若發(fā)生了錯(cuò)誤,結(jié)束碼為非0。 4 系統(tǒng)軟件設(shè)計(jì) 本系統(tǒng)主要采用上位機(jī)輪詢方式進(jìn)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(shí)刷新監(jiān)控主機(jī)中各PLC分機(jī)的實(shí)時(shí)數(shù)據(jù)。而對(duì)于PLC主動(dòng)發(fā)出的報(bào)警信息,上位機(jī)采用中斷的方式實(shí)現(xiàn)通信。 上位機(jī)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(jī)的指令后,進(jìn)行判斷,看其是否正確,如果正確,則向上位機(jī)傳送數(shù)據(jù)(包含首尾校驗(yàn)字節(jié));否則,PLC拒絕向上位機(jī)傳送數(shù)據(jù)。上位機(jī)接收到PLC傳來的數(shù)據(jù)后也要進(jìn)行判斷正確與否,如果正確,則接收,否則拒絕接收。
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