描述
2711-K9C1
基金會現(xiàn)場總線FF(Foundation Fieldbus)
基金會現(xiàn)場總線是國際上幾家現(xiàn)場總線經(jīng)過激烈競爭后形成的的一種現(xiàn)場總線,由現(xiàn)場總線基金會推出。與私有的網(wǎng)絡(luò)總線協(xié)議不同,F(xiàn)F總線不附屬于任何一個企業(yè)或國家。其總線體系結(jié)構(gòu)是參照、ISO的OSI模型中物理層、數(shù)據(jù)鏈路層和應(yīng)用層,并增加了用戶層而建立起來的通信模型。FF得到了世界上幾乎所有的著名儀表制造商的支持,同時遵守IEC的協(xié)議規(guī)劃,與IEC的現(xiàn)場總線國際標準和草案基本-致,加上它在技術(shù)上的優(yōu)勢,所以極有希望成為將來的主要國際標準。FF總線提供了Hl和H2兩種物理層標準。Hl是用于過程控制的低速總線,傳輸速率為31.25Kbps,傳輸距離為200m、450m、1200m、1900m四種(加中繼器可以延長),可用總線供電,支持本質(zhì)安全設(shè)備和非本質(zhì)安全總線設(shè)備。H2為高速總線,其傳輸速率為1Mbps(此時傳輸距離為750m)或2.5bps(此時傳輸距離為為500m)。H1和H2每段節(jié)點數(shù)可達32個,使用中繼器后可達240個,Hl和H2可通過網(wǎng)橋互連。FF的突出特點在于設(shè)備的互操作性、改善的過程數(shù)據(jù)、更早的預(yù)測維護及可靠的安全性。過程現(xiàn)場總線Profibus
Profibus由Siemens公司提出并極力倡導(dǎo),己先后成為德國國家標準DIN19245和歐洲標準EN50170,是一種開放而獨立的總線標準,在機械制造、工業(yè)過程控制、智能建筑中充當通信網(wǎng)絡(luò)。Profibus由Profibus-PA、Profibus-DP和Profibus-FMS三個系列組成。Profibus-PA (Process Automation)用于過程自動化的低速數(shù)據(jù)傳輸,其基本特性同F(xiàn)F的H1總線,可以提供總線供電和本質(zhì)安全,并得到了專用集成電路(ASIC)和軟件的支持。Profibus-DP與Profibus-PA兼容,基本特性同F(xiàn)F的H2總線,可實現(xiàn)高速傳輸,適用于分散的外部設(shè)備和自控設(shè)備之間的高速數(shù)據(jù)傳輸,用于連接Profibus-PA和加工自動化。Profibus-FMS適用于一般自動化的中速數(shù)據(jù)傳輸,主要用于傳感器、執(zhí)行器、電氣傳動、PLC、紡織和樓宇自動化等。后兩個系列采用RS485通信標準,傳輸速率從9.6kbps到12Mbps,傳輸距離從1200M到l00m(與傳輸速率有關(guān))。介質(zhì)存取控制的基本方式為主站之間的令牌方式和主站與從站之間的主從方式,以及綜合這兩種方式的混合方式。Profibus是一種比較成熟的總線,在工程上的應(yīng)用十分廣泛。
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