IC693MDL350
IC693MDL350IC693MDL350采用開放性的網(wǎng)絡(luò)拓?fù)浣Y(jié)構(gòu)和通訊協(xié)議也是提高整個(gè)系統(tǒng)可靠性的重要措施。在早期DCS系統(tǒng)中,由于普通網(wǎng)絡(luò)系統(tǒng)和通訊協(xié)議很難滿足要求,許多廠商都開發(fā)了專有通訊系統(tǒng)和專用通訊協(xié)議,但其最大缺點(diǎn)就是其專用性,廠商之間相互封閉,其可靠性需要廠商自己不斷完善和發(fā)展,因此導(dǎo)致開發(fā)成本很高。隨著計(jì)算機(jī)網(wǎng)絡(luò)技術(shù)的迅猛發(fā)展,IEC8802.x,((與人們熟悉的IEEE802.x標(biāo)準(zhǔn)相對(duì)應(yīng))系列標(biāo)準(zhǔn)相繼推出,通用計(jì)算機(jī)網(wǎng)絡(luò)的性能和可靠性不斷提高,而價(jià)格迅速下降。在這種趨勢(shì)下,主要DCS廠商都紛紛放棄發(fā)展自己獨(dú)有網(wǎng)絡(luò)產(chǎn)品的做法,轉(zhuǎn)而采用通用計(jì)算機(jī)網(wǎng)絡(luò)結(jié)構(gòu)和相關(guān)軟硬件產(chǎn)品。在這方面最為典型的例子就是FDDI網(wǎng)絡(luò)在控制網(wǎng)絡(luò)中的使用,由于FDDI被設(shè)計(jì)用于骨干高速網(wǎng)絡(luò),與生俱來的雙環(huán)拓?fù)浣Y(jié)構(gòu)使其不僅具有冗余特性,而且具有容錯(cuò)特點(diǎn),即使在雙環(huán)同時(shí)斷開時(shí)仍然能夠維持整個(gè)系統(tǒng)的正常通訊,這些FDDI標(biāo)準(zhǔn)特性使得廠商不需要自己?jiǎn)为?dú)設(shè)計(jì)冗余控制網(wǎng)絡(luò)之間的無擾切換系統(tǒng)。與此同時(shí),由于FDDI網(wǎng)絡(luò)被設(shè)計(jì)用于骨干網(wǎng),因此具有大量標(biāo)準(zhǔn)硬件與常規(guī)的以太網(wǎng)和令牌網(wǎng)等互連,從而具有很好的開放性和很高的可靠性。~~~~~~~~~~~~~~~~~~~~~~~~~~~~
公司 名稱:廈門泰尼電氣有限公司
固定 電話:0592-6809819
聯(lián) 系 人:張亮
傳 真:0592-6890859【請(qǐng)備注“張亮”收】
商 務(wù) Q Q: 2314094943
手 機(jī):18030028083
Q Q 郵 箱:2314094943@qq.com
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公司地址:廈門市海滄區(qū)海滄街道濱湖一里7號(hào)2008室
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