Cycle time properties of the PROFIBUS timed-token protocol

Authors:
E. Tovar;F. Vasques
Affiliations:
Department of Computer Engineering, Polytechnic Institute of Porto, Rua de São Tomé, 4200 Porto, Portugal;Department of Mechanical Engineering, University of Porto, Rua dos Bragas, 4050-123 Porto, Portugal
Venue:
Computer Communications
Year:
1999

Citing 7
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Abstract

A recent trend in distributed computer-controlled systems (DCCS) is to interconnect the distributed computing elements by means of multi-point broadcast networks. Since the network medium is shared between a number of network nodes, access contention exists and must be solved by a medium access control (MAC) protocol. Usually, DCCS impose real-time constraints. In essence, by real-time constraints we mean that traffic must be sent and received within a bounded interval, otherwise a timing fault is said to occur. This motivates the use of communication networks with a MAC protocol that guarantees bounded access and response times to message requests. PROFIBUS is a communication network in which the MAC protocol is based on a simplified version of the timed-token protocol. In this paper we address the cycle time properties of the PROFIBUS MAC protocol, since the knowledge of these properties is of paramount importance for guaranteeing the real-time behaviour of a distributed computer-controlled system which is supported by this type of network.