3604E
現(xiàn)貨熱銷 停產(chǎn)老備件,模塊,驅(qū)動(dòng)器,控制器等……
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交換以太網(wǎng)(Switched Ethernet)的出現(xiàn)克服了這一缺點(diǎn),以太網(wǎng)的交換機(jī)(Switch)是數(shù)據(jù)鏈路層(ISO/OSI參考模型第二層)的多端口網(wǎng)橋,也可以說是智能分配器。交換機(jī)將其管理的網(wǎng)絡(luò)以星型拓?fù)浣Y(jié)構(gòu)劃分為許多物理上互相隔離而邏輯上互相聯(lián)系的節(jié)點(diǎn),每一節(jié)點(diǎn)單獨(dú)與交換機(jī)建立物理連接,在通信的時(shí)候交換機(jī)會在發(fā)送端口與接受端口間建立一個(gè)獨(dú)占的全雙工通道,它具有以太網(wǎng)的全部帶寬并避免沖突。 交換以太網(wǎng)在獲得確定性的同時(shí),傳輸速度也有極大的提高。千兆以太網(wǎng)已普及,10Gb/s的交換以太網(wǎng)正在開發(fā)。當(dāng)以太網(wǎng)用于信息技術(shù)時(shí),應(yīng)用層含有HTTP(超級文本傳輸協(xié)議)、FTP (文件傳輸協(xié)議)、SMTP(簡單電子郵件傳送協(xié)議)和Telnet(遠(yuǎn)程登錄)。這些基于TCP/IP的協(xié)議簇已經(jīng)成為工業(yè)界事實(shí)上的網(wǎng)絡(luò)標(biāo)準(zhǔn),在不同廠商的不同網(wǎng)絡(luò)系統(tǒng)互聯(lián)方面起著關(guān)鍵作用。但當(dāng)以太網(wǎng)用于工業(yè)控制時(shí),體現(xiàn)在應(yīng)用層的是實(shí)時(shí)通信、用于系統(tǒng)組態(tài)的對象以及工程模型的應(yīng)用協(xié)議
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