??? 根據(jù)國際電工委員會（IEC）和美國儀表協(xié)會(ISA)的定義：現(xiàn)場總線是連接智能現(xiàn)場設(shè)備和自動化系統(tǒng)的數(shù)字、雙向傳輸、多分支結(jié)構(gòu)的通信網(wǎng)絡(luò)，它的關(guān)鍵標(biāo)志是能支持雙向多節(jié)點、總線式的全數(shù)字通訊，具有可靠性高、穩(wěn)定性好、抗干擾能力強、通信速率快、系統(tǒng)安全、造價低廉、維護成本低等特點。
●國際電工協(xié)會（IEC）的SP50委員會對現(xiàn)場總線有以下三點要求：
（1）同一數(shù)據(jù)鏈上過程控制單元（PCU）、PLC等與數(shù)字1/0設(shè)備互連；
（2）現(xiàn)場總線控制器可對總線上的多個操作站、傳感器及執(zhí)行機構(gòu)等進行數(shù)據(jù)存??；
（3）通信媒體安裝費用較低。

●SP50委員會提出的兩種現(xiàn)場總線結(jié)構(gòu)模型是：
（1）星型總線用短距離、廉價、低速率電纜取代模擬信號傳輸線
（2）總線型總線數(shù)據(jù)傳輸距離長、速率高，采用點對點、點對多點和廣播式通信方式

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廈門仲鑫達自動化設(shè)備有限公司
歐陽英（銷售經(jīng)理）
移動電話：13394057292
電話：0592-5856292
傳真：0592-5165561
郵箱：370848070@qq.com
Q Q ：370848070 , 2687338778
地址；廈門思明區(qū)湖濱東路湖光大廈8樓A單元
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專業(yè)銷售大型控制系統(tǒng)及各種進口模塊備件品牌銷售：Allen Bradley（羅克韋爾）: 1756/1757/1747/1746/1771/1785系列、Reliance機電等產(chǎn)品。 Schneider（施耐德）：MODICON 140系列、Quantum內(nèi)存卡、Quantum電源模塊等。GE（美國通用電氣）IC693/IC697系列PLC 模塊，F(xiàn)OXOBORO FBM/CP30/CP40/CP60模塊,TRICONEX冗余容錯系統(tǒng)模塊:3700A/3805E/3604E/3503E/3504E，等一些停產(chǎn)備品、備件的銷售。
所有備件的質(zhì)保期均為1年，經(jīng)過專業(yè)測試認證。

如果您需要訂購產(chǎn)品超過1件，請與我們聯(lián)系，我們可以為您提供折扣。

我們僅采用快遞方式遞送備件。（順豐）

如果您發(fā)現(xiàn)其他供貨商為相同產(chǎn)品提供更為低廉的價格，我們也愿意參照其價格向您提供進一步的折扣。如果還有其他任何問題，請隨時與我們聯(lián)系。

請讓我們知道您有任何，備品，備件，的需要，我們可以給您進一步的援助，我們等候您的詢盤。

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