A06B-0313-B005 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)動控制而言，以太網(wǎng)、現(xiàn)場總線以及其他技術(shù)（如外圍組件互連）歷來都是相互競爭的，用以在工業(yè)自動化和控制系統(tǒng)中獲得對一些最苛刻要求的工作負(fù)載的處理權(quán)限。運(yùn)動控制應(yīng)用要求確定性（保證網(wǎng)絡(luò)能夠及時將工作負(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時的 CSMA/CD 數(shù)據(jù)鏈路層，但它還是缺乏可預(yù)測性。此外，典型堆棧中的 TCP/IP 的高度復(fù)雜性并未針對實時流量的可靠傳送進(jìn)行優(yōu)化。因此，現(xiàn)場總線以及帶有基于 ASIC 的 PCI 卡的 PC 控制架構(gòu)一直是常見的運(yùn)動控制解決方案。
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，然而它在運(yùn)動控制中還遠(yuǎn)沒有占到主導(dǎo)地位。我們來看看它能夠并且將會在未來幾年的競爭中越來越被接受的三個原因。
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來源：賢集網(wǎng)
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