描述
工業(yè)以太網(wǎng)PROFINET技術(shù)應(yīng)用
所謂工業(yè)以太網(wǎng),一般來講是指技術(shù)上與商用以太網(wǎng)(即IEEE802.3標(biāo)準(zhǔn))兼容,但在產(chǎn)品設(shè)計時,在材質(zhì)的選用、產(chǎn)品的強度、適用性以及實時性、可互操作性、可靠性、抗干擾性和本質(zhì)安全等方面能滿足工業(yè)現(xiàn)場的需要。
PROFINET是Process Field Net的縮寫,它是PROFIBUS客戶、生產(chǎn)商與系統(tǒng)集成聯(lián)盟協(xié)會推出的在PROFIBUS與以太網(wǎng)間全開放的通信協(xié)議。PROFINET是一種基于實時工業(yè)以太網(wǎng)的自動化解決方案,它以一整套完整高性能并可升級的方式,可以為PROFIBUS及其他各種現(xiàn)場總線網(wǎng)絡(luò)提供以太網(wǎng)移植服務(wù);PROFINET標(biāo)準(zhǔn)的開放性保證了其長遠的兼容性與擴展性,從而可以保護用戶的投資與利益。PROFINET可以使工程與組態(tài)、試運行、操作和維護更為便捷,并且能夠與PROFIBUS以及其它現(xiàn)場總線網(wǎng)絡(luò)實現(xiàn)無縫集成與連接。
這種跨越供應(yīng)商的開放式標(biāo)準(zhǔn)建立在工業(yè)以太網(wǎng)基礎(chǔ)之上,覆蓋了工廠自動化的所有領(lǐng)域。依賴于現(xiàn)行的IT標(biāo)準(zhǔn),并且無條件地支持TCP/IP協(xié)議,從而確保了公司范圍內(nèi)從辦公區(qū)域到現(xiàn)場級的集成通訊。它主要包含3方面的技術(shù):①基于通用對象模型(COM)的分布式自動化系統(tǒng);②規(guī)定了PROFIBUS和標(biāo)準(zhǔn)以太網(wǎng)之間的開放、透明通信;③提供了一個包括設(shè)備層和系統(tǒng)層、獨立于制造商的系統(tǒng)模型。
PROFINET采用標(biāo)準(zhǔn)以太網(wǎng)作為連接介質(zhì),采用TCP/IP協(xié)議加上應(yīng)用層的RPC/DCOM來完成節(jié)點之間的通信和網(wǎng)絡(luò)尋址。它可以同時掛接傳統(tǒng)PROFIBUS系統(tǒng)和新型的智能現(xiàn)場設(shè)備?,F(xiàn)有的PROFIBUS網(wǎng)段可以通過一個代理設(shè)備(proxy)連接到PROFINET網(wǎng)絡(luò)當(dāng)中,使整套PROFIBUS設(shè)備和協(xié)議能夠原封不動地在PROFINET中使用。傳統(tǒng)的PROFIBUS設(shè)備可通過代理proxy與PROFINET上面的COM對象進行通信,并通過OLE自動化接口實現(xiàn)COM對象之間的調(diào)用。
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