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Ring stability of the PROFIBUS token-passing protocol over error-prone links

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2 Author(s)
Willig, A. ; Dept. of Electr. Eng., Tech. Univ. Berlin, Germany ; Wolisz, A.

The PROFIBUS is a well-known and widely used fieldbus. On the medium access control layer, it employs a token-passing protocol where all active stations form a logical ring on top of a broadcast medium. This protocol is designed to deliver real-time data transmission services in harsh industrial environments. A necessary prerequisite for timeliness and quality of service is the ring membership stability of the logical ring in the presence of transmission errors, since only ring members are allowed to transmit data. In this paper, the ring membership stability under high error rates and using different error models is analyzed. The choice of the error behavior is in turn inspired by properties of possible future transmission technologies, e.g., wireless LANs. It is shown that the protocol has serious stability problems. To attack these problems, two changes to the protocol and its parameters are proposed, which can be implemented in a purely local manner. We show that they significantly improve ring stability

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:48 ,  Issue: 5 )

Date of Publication:

Oct 2001

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