A Bandwidth Allocation Scheme in Fieldbuses

Field devices in factory automation and process control systems generate time-critical, periodic, and time-available data. These data share the bandwidth of one fieldbus network medium. This paper reviews a bandwidth allocation scheme (BAS) that is applicable to many different kinds of fieldbuses. The BAS satisfies the real-time transmission requirements of time-critical and periodic data, and fully utilizes the bandwidth resources of the fieldbus network. The basic concept of the BAS is introduced and its implementation in Foundation Fieldbus, Profibus, and CAN protocols is discussed.Manuscript received February 11, 2008; revised October 27, 2009; accepted April 5, 2010. Recommended by Editorial Board member Seung Hi Lee under the direction of Editor Young-Hoon Joo. This work was supported by the GRRC program of Gyeonggi province. [GRRC Hanyang 2009-B01, Building/Home USN Technology for Smart Grid]