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Fieldbus Networks: Real-Time from the Perspective of the Application Tasks
Ref: HURRAY-TR-0011       Publication Date: 6, Sep, 2000

Abstract:
Fieldbus communication networks aim to interconnect sensors, actuators and controllers within distributed computer-controlled systems. Therefore, they constitute the foundation upon which real-time applications are to be implemented. A potential leap towards the use of fieldbus in such time-critical applications lies in the evaluation of its temporal behaviour. In the past few years several research works have been performed on a number of fieldbuses. However, these have mostly focused on the message passing mechanisms, without taking into account the communicating application tasks running in those distributed systems. The main contribution of this paper is to provide an approach for engineering real-time fieldbus systems where the schedulability analysis of the distributed system integrates both the characteristics of the application tasks and the characteristics of the message transactions performed by these tasks. In particular, we address the case of systems where the Process-Pascal multitasking language is used to develop P-NET based distributed applications.

André Mendes

,

Luis Lino Ferreira

,

Eduardo Tovar

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