Communication response time in P-NET networks: Worst-case analysis considering the actual token utilization

• Type: Article in International Scientific Journal
• Date: 2002

Authors

tovar, e (Author) Other; vasques, f (Author) FEUP; burns, a (Author) Other

Journal

Title: Real-Time Systems

Vol. 22

Pages: 229-249

ISSN: 0922-6443

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 9 Citations

Scopus - 10 Citations

Other information

Authenticus ID: P-000-PM1

DOI: 10.1023/a:1014554317965

Abstract (EN): Fieldbus networks aim at the interconnection of field devices such as sensors, actuators and small controllers. Therefore, they are an effective technology upon which distributed computer-controlled systems (DCCS) can be built. DCCS impose strict timeliness requirements to the communication network. In essence, by timeliness requirements we mean that traffic must be sent and received within a bounded interval, otherwise a timing fault is said to occur. P-NET is a multi-master fieldbus standard based on a virtual token passing scheme. In P-NET each master is allowed to transmit only one message per token visit, which means that in the worst-case the communication response time could be derived considering that the token is fully utilized by all stations. However, such analysis can be proved to be quite pessimistic. In this paper, we propose a more sophisticated P-NET timing analysis model, which considers the actual token utilization by different masters. The major contribution of this model is to provide a less pessimistic, and thus more accurate, analysis for the evaluation of the worst-case communication response time in P-NET fieldbus networks.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 21