化工自动化及仪表
化工自動化及儀錶
화공자동화급의표
CONTROL AND INSTRUMENTS IN CHEMICAL INDUSTRY
2001年
2期
4-7
,共4页
现场总线%MAC层%令牌环/令牌总线%CSMA/CD
現場總線%MAC層%令牌環/令牌總線%CSMA/CD
현장총선%MAC층%령패배/령패총선%CSMA/CD
现场总线的MAC层在很大程度上决定了网络的实时性与可靠性，可以说是现场总线系统的关键。介绍了MAC层的两大体系：令牌环/令牌总线和CSMA/CD，并深入分析了它们各自的代表：PROFIBUS和LONWORKS的MAC层的实现方式，并探讨了它们的优缺点。
現場總線的MAC層在很大程度上決定瞭網絡的實時性與可靠性，可以說是現場總線繫統的關鍵。介紹瞭MAC層的兩大體繫：令牌環/令牌總線和CSMA/CD，併深入分析瞭它們各自的代錶：PROFIBUS和LONWORKS的MAC層的實現方式，併探討瞭它們的優缺點。
현장총선적MAC층재흔대정도상결정료망락적실시성여가고성，가이설시현장총선계통적관건。개소료MAC층적량대체계：령패배/령패총선화CSMA/CD，병심입분석료타문각자적대표：PROFIBUS화LONWORKS적MAC층적실현방식，병탐토료타문적우결점。
The MAC layer largely determines the real-time behavior and reliability of a fielbdus,so it is said to be the key to the fieldbus.The paper discusses two main systems of MAC layer:token ring/token bus and CSMA/CD.Moreover,we analyze the methods of realizing MAC layer,which are used by PROFIBUS and LONWORKS,representatives of the two systems.And their advantages and disadvantages and also discussed.
