IC697CPU789
IC697CPU789首先，DCS的骨架—系統(tǒng)網(wǎng)絡(luò)，它是DCS的基礎(chǔ)和核心。由于網(wǎng)絡(luò)對于DCS整個(gè)系
統(tǒng)的實(shí)時(shí)性、可靠性和擴(kuò)充性，起著決定性的作用，因此各廠家都在這方面進(jìn)
行了精心的設(shè)計(jì)。對于DCS的系統(tǒng)網(wǎng)絡(luò)來說，它必須滿足實(shí)時(shí)性的要求，即在確
定的時(shí)間限度內(nèi)完成信息的傳送。這里所說的“確定”的時(shí)間限度，是指在無
論何種情況下，信息傳送都能在這個(gè)時(shí)間限度內(nèi)完成，而這個(gè)時(shí)間限度則是根
據(jù)被控制過程的實(shí)時(shí)性要求確定的。因此，衡量系統(tǒng)網(wǎng)絡(luò)性能的指標(biāo)并不是網(wǎng)
絡(luò)的速率，即通常所說的每秒比特?cái)?shù)（bps），而是系統(tǒng)網(wǎng)絡(luò)的實(shí)時(shí)性，即能在
多長的時(shí)間內(nèi)確保所需信息的傳輸完成。系統(tǒng)網(wǎng)絡(luò)還必須非?？煽浚瑹o論在任
何情況下，網(wǎng)絡(luò)通信都不能中斷，因此多數(shù)廠家的DCS均采用雙總線、環(huán)形或雙
重星形的網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)。為了滿足系統(tǒng)擴(kuò)充性的要求，系統(tǒng)網(wǎng)絡(luò)上可接入的最
大節(jié)點(diǎn)數(shù)量應(yīng)比實(shí)際使用的節(jié)點(diǎn)數(shù)量大若干倍。這樣，一方面可以隨時(shí)增加新
的節(jié)點(diǎn)，另一方面也可以使系統(tǒng)網(wǎng)絡(luò)運(yùn)行于較輕的通信負(fù)荷狀態(tài)，以確保系統(tǒng)
的實(shí)時(shí)性和可靠性。在系統(tǒng)實(shí)際運(yùn)行過程中，各個(gè)節(jié)點(diǎn)的上網(wǎng)和下網(wǎng)是隨時(shí)可
能發(fā)生的，特別是操作員站，這樣，網(wǎng)絡(luò)重構(gòu)會經(jīng)常進(jìn)行，而這種操作絕對不
能影響系統(tǒng)的正常運(yùn)行，因此，系統(tǒng)網(wǎng)絡(luò)應(yīng)該具有很強(qiáng)在線網(wǎng)絡(luò)重構(gòu)功能。
其次，這是一種完全對現(xiàn)場I/O處理并實(shí)現(xiàn)直接數(shù)字控制（DDC）功能的網(wǎng)絡(luò)節(jié)
點(diǎn)。一般一套DCS中要設(shè)置現(xiàn)場I/O控制站，用以分擔(dān)整個(gè)系統(tǒng)的I/O和控制功能
。這樣既可以避免由于一個(gè)站點(diǎn)失效造成整個(gè)系統(tǒng)的失效，提高系統(tǒng)可靠性，
也可以使各站點(diǎn)分擔(dān)數(shù)據(jù)采集和控制功能，有利于提高整個(gè)系統(tǒng)的性能。DCS的
操作員站是處理一切與運(yùn)行操作有關(guān)的人機(jī)界面（HMI-Human Machine
Interface或operator interface）功能的網(wǎng)絡(luò)節(jié)點(diǎn)。
◆ 企業(yè)名稱：廈門泰尼電氣有限公司
◆ 企業(yè)性質(zhì)： 有限責(zé)任公司
◆ 主營業(yè)務(wù)：DCS,PLC
◆ 經(jīng)營模式： 貿(mào)易
◆ 貿(mào)易地區(qū)： 全國
◆ 聯(lián)系人： 小廖女士）
◆ 電話：0592-6539066
◆ 聯(lián)系手機(jī)：13400716209
◆ QQ:1490371370
◆ 傳真：0592-6890859 （備注“01008”收）
◆ E-mail： 1490371370@qq.com
◆ 郵政編碼： 361026
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