MVI46-MCM |
MVI46-MCM |
充足的庫存,超快的貨期,,歡迎來電查詢!
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我們的方針:專業(yè),專注,專心!
我們的口號:面向未來,超越!
廈門岳航計算機工程有限公司
聯(lián)系人:陳如(銷售工程師)
電話:0592-5085329
手機:18030132586
傳真:0592-5165561(陳工)
郵箱:1151195663@qq.com
qq:1151195663
廈門市思明區(qū)湖濱東路湖光大廈8樓A座
一般來講,控制系統(tǒng)網(wǎng)絡(luò)可分為3層:信息層、控制層和設(shè)備層(傳感/執(zhí)行層)。傳統(tǒng)的控制系統(tǒng)在信息層大都采用以太網(wǎng),而在控制層和設(shè)備層一般采用不同的現(xiàn)場總線或其他專用網(wǎng)絡(luò)。目前,以太網(wǎng)已經(jīng)滲透到了控制層和設(shè)備層,很多的PLC和遠程I/O供應(yīng)商都能提供支持TCP/IP的以太網(wǎng)接口的產(chǎn)品。以太網(wǎng)之所以給自動化市場帶來風暴式的革命,主要有3個原因:低成本的刺激和速度的提高;現(xiàn)代企業(yè)對實時生產(chǎn)信息有越來越多的要求;以太網(wǎng)的開放性和兼容性。
早期的以太網(wǎng),多節(jié)點共享同一個傳輸媒體,稱為共享以太網(wǎng)(Shared Ethernet),節(jié)點間通信采用廣播方式,易發(fā)生沖突。共享以太網(wǎng)用CSMA/CD技術(shù)來避免沖突,即發(fā)送方檢測到?jīng)_突就暫停發(fā)送,隨機延遲一段時間后再重新發(fā)送直到成功。由于延遲時間是隨機的,不能事先知道,因而共享以太網(wǎng)的時間響應(yīng)具有不確定性,不能用于強實時性場合。
交換以太網(wǎng)(Switched Ethernet)的出現(xiàn)克服了這一缺點,以太網(wǎng)的交換機(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。交換機將其管理的網(wǎng)絡(luò)以星型拓撲結(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,每一節(jié)點單獨與交換機建立物理連接,在通信的時候交換機會在發(fā)送端口與接受端口間建立一個獨占的全雙工通道,它具有以太網(wǎng)的全部帶寬并避免沖突。
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