Abstract
This paper presents an analysis of the Quality of Service (QoS) Architecture of WorldFIP, which is a Fieldbus used to connect all kind of devices into a factory. The analysis shows that this Fieldbus makes use of a static resource reservation mechanism, i.e. at network configuration time the human operator configures the nodes and their periodic traffic in order to meet and guarantee the application requirements, at application run-time. Nevertheless, in manufacturing applications there exist also aperiodic traffic (events and alarms) for which the Fieldbus must provide guaranteed levels of QoS at application run-time. The analysis shows that WorldFIP provides only the best-effort level of QoS for a kind of aperiodic traffic, called aperiodic messages; therefore new QoS architectures are required. Finally, this paper presents the specification of both a new WorldFIP QoS architecture and a WorldFIP Resource ReSerVation Protocol using the Specification and Description Language (SDL).
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