6ES75184AP000AB0
6ES75184AP000AB0
6ES75184AP000AB0
6ES75184AP000AB0
嵌人式以太網(wǎng)是最近網(wǎng)絡(luò)應(yīng)用熱點(diǎn),就是通過Internet使所有連接網(wǎng)絡(luò)的設(shè)備彼此互通,從計(jì)算機(jī)、PDA、通信設(shè)備到儀器儀表、家用電器等。在企業(yè)內(nèi)部,可以利用企業(yè)信息網(wǎng)絡(luò),進(jìn)行工廠實(shí)時(shí)運(yùn)行數(shù)據(jù)的發(fā)布和顯示,管理者通過Web瀏覽器對(duì)現(xiàn)場(chǎng)工況進(jìn)行實(shí)時(shí)遠(yuǎn)程監(jiān)控、遠(yuǎn)程設(shè)備調(diào)試和遠(yuǎn)程設(shè)備故障診斷和處理。實(shí)現(xiàn)的最簡(jiǎn)單辦法就是采用獨(dú)立的以太網(wǎng)控制器,連接具有TCP/IP界面的控制主機(jī)以及具有RS-232或RS-4.85接口的現(xiàn)場(chǎng)設(shè)備。以太網(wǎng)控制器在這里扮演了通用計(jì)算機(jī)網(wǎng)絡(luò)和現(xiàn)場(chǎng)各類設(shè)備之間的一個(gè)橋梁。
4、工業(yè)以太網(wǎng)技術(shù)的發(fā)展趨勢(shì)與前景
由于以太網(wǎng)具有應(yīng)用廣泛、價(jià)格低廉、通信速率高、軟硬件產(chǎn)品豐富、應(yīng)用支持技術(shù)成熟等優(yōu)點(diǎn),目前它已經(jīng)在工業(yè)企業(yè)綜合自動(dòng)化系統(tǒng)中的資源管理層、執(zhí)行制造層得到了廣泛應(yīng)用,并呈現(xiàn)向下延伸直接應(yīng)用于工業(yè)控制現(xiàn)場(chǎng)的趨勢(shì)。從目前國(guó)際、國(guó)內(nèi)工業(yè)以太網(wǎng)技術(shù)的發(fā)展來看,目前工業(yè)以太網(wǎng)在制造執(zhí)行層已得到廣泛應(yīng)用,并成為事實(shí)上的標(biāo)準(zhǔn)。未來工業(yè)以太網(wǎng)將在工業(yè)企業(yè)綜合自動(dòng)化系統(tǒng)中的現(xiàn)場(chǎng)設(shè)備之間的互連和信息集成中發(fā)揮越來越重要的作用??偟膩碚f,工業(yè)以太網(wǎng)技術(shù)的發(fā)展趨勢(shì)將體現(xiàn)在以下幾個(gè)方面:
(一) 工業(yè)以太網(wǎng)與現(xiàn)場(chǎng)總線相結(jié)合
工業(yè)以太網(wǎng)技術(shù)的研究還只是近幾年才引起國(guó)內(nèi)外工控專家的關(guān)注。而現(xiàn)場(chǎng)總線經(jīng)過十幾年的發(fā)展,在技術(shù)上日漸成熟,在市場(chǎng)上也開始了全面推廣,并且形成了一定的市場(chǎng)。就目前而言,全面代替現(xiàn)場(chǎng)總線還存在一些問題,需要進(jìn)一步深入研究基于工業(yè)以太網(wǎng)的全新控制系統(tǒng)體系結(jié)構(gòu),開發(fā)出基于工業(yè)以太網(wǎng)的系列產(chǎn)品。因此,近一段時(shí)間內(nèi),工業(yè)以太網(wǎng)技術(shù)的發(fā)展將與現(xiàn)場(chǎng)總線相結(jié)合,具體表現(xiàn)在:
(1) 物理介質(zhì)采用標(biāo)準(zhǔn)以太網(wǎng)連線,如雙絞線、光纖等;
(2) 使用標(biāo)準(zhǔn)以太網(wǎng)連接設(shè)備(如交換機(jī)等),在工業(yè)現(xiàn)場(chǎng)使用工業(yè)以太網(wǎng)交換機(jī);
(3) 采用IEEE802.3物理層和數(shù)據(jù)鏈路層標(biāo)準(zhǔn)、TCP/IP協(xié)議組;
(4) 應(yīng)用層(甚至是用戶層)采用現(xiàn)場(chǎng)總線的應(yīng)用層、用戶層協(xié)議;
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