A06B-6096-H105
借助TSN,業(yè)界已經(jīng)成功開發(fā)出符合IEEE 802.1的標(biāo)準(zhǔn)以太網(wǎng)擴(kuò)展版本,成功地?cái)[脫了過去的限制。因此,ISO七層模型中的標(biāo)準(zhǔn)化第2層現(xiàn)在已經(jīng)可以向上兼容之前的以太網(wǎng)和硬實(shí)時(shí)功能。通過802.1AS-rev,TSN還定義了可互操作的統(tǒng)一方法,用于同步網(wǎng)絡(luò)中的分布式時(shí)鐘。由于通過TSN總能實(shí)現(xiàn)"盡力而為"的通信,所以在硬實(shí)時(shí)應(yīng)用以及所有其它應(yīng)用(網(wǎng)絡(luò)服務(wù)器、SSH等)中,共用電纜成為可能。在這方面,TSN與PROFINET IRT并沒有什么不同,它也提供了相仿的性能。
采用TSN的新增需求是需要更廣泛的網(wǎng)絡(luò)配置。集中式或分布式配置均有可能。目前正在討論和實(shí)施兼顧兩種類型的配置。未來的發(fā)展目標(biāo)是實(shí)現(xiàn)兩種配置機(jī)制之間的互操作性。
這一切都再好不過了,TSN的實(shí)際優(yōu)勢(shì)到底是什么?
最常見的是,它提供了市面上更低成本的網(wǎng)絡(luò)接口,并且適用于更廣泛的市場(chǎng)。畢竟,TSN也能用于未來的樓宇自動(dòng)化和汽車行業(yè)中。事實(shí)上,預(yù)計(jì)嵌入式TSN解決方案的市場(chǎng)規(guī)模將大大超過所有工業(yè)以太網(wǎng)解決方案當(dāng)前市場(chǎng)的總和。
TSN相較以前的工業(yè)以太網(wǎng)方式較大的技術(shù)優(yōu)勢(shì)是其可擴(kuò)展性。與當(dāng)前的工業(yè)網(wǎng)絡(luò)不同,TSN并不針對(duì)特定的傳輸速率進(jìn)行定義。TSN可用于100 Mbps,也可同樣用于1 Gbps、10 Mbps或5 Gbps。
它還更好地優(yōu)化拓?fù)浣Y(jié)構(gòu),因?yàn)楝F(xiàn)在可以針對(duì)各個(gè)不同的區(qū)段選擇與之相適應(yīng)的數(shù)據(jù)速率。無論是1 Gbps、100 Mbps還是10 Mbps,都使用統(tǒng)一的第2層——IEEE802.1/TSN。
統(tǒng)一的網(wǎng)絡(luò)基礎(chǔ)設(shè)施還有助于相關(guān)人員完成建立和維護(hù)網(wǎng)絡(luò)的任務(wù),因?yàn)橥ㄟ^TSN,解決方案現(xiàn)在可以用于自動(dòng)化以外的其它領(lǐng)域,如建筑、過程和工廠自動(dòng)化以及能源分配等。
這為我們帶來了下一個(gè)優(yōu)勢(shì),即培訓(xùn)因素。TSN已經(jīng)成為許多大學(xué)的課題,多數(shù)尚處在研究階段。然而,技術(shù)和職業(yè)學(xué)院已經(jīng)對(duì)這個(gè)課題表現(xiàn)出極大的興趣。我們可以相當(dāng)負(fù)責(zé)任地說,TSN將成為工程師、技術(shù)人員和技術(shù)工人的必備基本知識(shí)。將不再需要針對(duì)不同的現(xiàn)場(chǎng)總線進(jìn)行再培訓(xùn)。
"棕地"(Brownfield),即現(xiàn)有的協(xié)議該怎么辦?
在幾乎所有與TSN相關(guān)的工作組中,都會(huì)反復(fù)出現(xiàn)一個(gè)主題:如何同時(shí)保障向TSN的過渡和向現(xiàn)有安裝系統(tǒng)(如"棕地"應(yīng)用)的供給?
A06B-6096-H105
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A06B-6096-H105