A06B-0313-B032
A06B-0313-B006 以太網(wǎng)正成為工業(yè)應(yīng)用中日益重要的網(wǎng)絡(luò)。
就運(yùn)動(dòng)控制而言，以太網(wǎng)、現(xiàn)場(chǎng)總線以及其他技術(shù)（如外圍組件互連）歷來(lái)都是相互競(jìng)爭(zhēng)的，用以在工業(yè)自動(dòng)化和控制系統(tǒng)中獲得對(duì)一些最苛刻要求的工作負(fù)載的處理權(quán)限。運(yùn)動(dòng)控制應(yīng)用要求確定性（保證網(wǎng)絡(luò)能夠及時(shí)將工作負(fù)載傳送至預(yù)定的節(jié)點(diǎn)），這是確保位置保持所必需的，這進(jìn)而又將確保驅(qū)動(dòng)器的精確停止、適當(dāng)?shù)募铀?減速以及其他任務(wù)。
標(biāo)準(zhǔn)的 IEEE 802.3 以太網(wǎng)從未達(dá)到這方面的要求。即使全雙工交換和隔離沖突域淘汰了過(guò)時(shí)的 CSMA/CD 數(shù)據(jù)鏈路層，但它還是缺乏可預(yù)測(cè)性。此外，典型堆棧中的 TCP/IP 的高度復(fù)雜性并未針對(duì)實(shí)時(shí)流量的可靠傳送進(jìn)行優(yōu)化。因此，現(xiàn)場(chǎng)總線以及帶有基于 ASIC 的 PCI 卡的 PC 控制架構(gòu)一直是常見(jiàn)的運(yùn)動(dòng)控制解決方案。
從 EtherNet/IP 到 EtherCAT 等以太網(wǎng)解決方案以其獨(dú)特的方式克服了這些缺點(diǎn)。盡管工業(yè)以太網(wǎng)相較于別的替代技術(shù)還有一些其它優(yōu)勢(shì)，然而它在運(yùn)動(dòng)控制中還遠(yuǎn)沒(méi)有占到主導(dǎo)地位。我們來(lái)看看它能夠并且將會(huì)在未來(lái)幾年的競(jìng)爭(zhēng)中越來(lái)越被接受的三個(gè)原因。
原文鏈接：https://www.xianjichina.com/special/detail_396230.html
來(lái)源：賢集網(wǎng)
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