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Schedulability analysis of real-time traffic in WorldFIP networks: An integrated approach

Title
Schedulability analysis of real-time traffic in WorldFIP networks: An integrated approach
Type
Article in International Scientific Journal
Year
2002
Authors
tovar, e
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fonseca, jag
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Journal
Vol. 49
Pages: 1165-1174
ISSN: 0278-0046
Publisher: IEEE
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Publicação em ISI Proceedings ISI Proceedings
Publicação em ISI Web of Science ISI Web of Science
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Scientific classification
CORDIS: Technological sciences > Engineering
Other information
Authenticus ID: P-000-MTK
Abstract (EN): The WorldFIP protocol is one of the profiles that constitute the European fieldbus standard EN-50170. It is particularly well suited to be used in distributed computer-controlled systems where a set of process variables must be shared among network devices. To cope with the real-time requirements of such systems, the protocol provides communication services based on the exchange of periodic and aperiodic identified variables. The periodic exchanges have the highest priority and are executed at run time according to a cyclic schedule. Therefore, the respective schedulability can be determined at pre-run-time when building the schedule table. Concerning the aperiodic exchanges, the situation is different since their priority is lower and they are handled according to a first-come-first-served policy. In this paper, a, response-time-based schedulability analysis for the real-time traffic is presented. Such analysis considers both types of traffic in an integrated way, according to their priorities. Furthermore, a fixed-priorities-based policy is also used to schedule the periodic traffic. The proposed analysis represents an improvement relative to previous work and it can be evaluated online as part of a traffic online admission control. This feature is of particular importance when a planning scheduler is used, instead of the typical offline static scheduler, to allow online changes to the set of periodic process variables.
Language: English
Type (Professor's evaluation): Scientific
Notes: Schedulability analysis of real-time traffic in WorldFIP networks: an integrated approach Almeida, L. ; Tovar, E. ; Fonseca, J.A.G. ; Vasques, F. Industrial Electronics, IEEE Transactions on Volume: 49 , Issue: 5 Digital Object Identifier: 10.1109/TIE.2002.803242 Publication Year: 2002 , Page(s): 1165 - 1174
No. of pages: 10
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