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2010 10th International Conference on Application of Concurrency to System Design (2006)
Turku, Finland
June 28, 2006 to June 30, 2006
ISSN: 1550-4808
ISBN: 0-7695-2556-3
pp: 101-110
Franck Cassez , IRCCyN Laboratory
Karine Altisen , Verimag Laboratory
Stavros Tripakis , Verimag Laboratory and Cadence Berkeley Labs
We study the monitoring and fault-diagnosis problems for dense-time real-time systems, where observers (monitors and diagnosers) have access to digital rather than analog clocks. Analog clocks are infinitely-precise, thus, not implementable. We show how, given a specification modeled as a timed automaton and a timed automaton model of the digital clock, a sound and optimal (i.e., as precise as possible) digital-clock monitor can be synthesized. We also show how, given plant and digital clock modeled as timed automata, we can check existence of a digital-clock diagnoser and, if one exists, how to synthesize it. Finally, we consider the problem of existence of digital-clock diagnosers where the digital clock is unknown. We show that there are cases where a digital clock, no matter how precise, does not exist, even though the system is diagnosable with analog clocks. Finally, we provide a sufficient condition for digital-clock diagnosability.
Franck Cassez, Karine Altisen, Stavros Tripakis, "In this work, we propose two translations: one from extended", 2010 10th International Conference on Application of Concurrency to System Design, vol. 00, no. , pp. 101-110, 2006, doi:10.1109/ACSD.2006.10
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