Abstract
This paper addresses the problem of Fault Detection and Isolation for a particular class of discrete event dynamic systems named Hierarchical Finite State Machines (HFSMs). A new version of the property of diagnosability for discrete event systems tailored to HFSMs is introduced. This notion, called L1-diagnosability, captures the possibility of detecting an unobservable fault event using only high level observations of HFSMs. Algorithms for testing L1-diagnosability are presented. In addition, guidelines are presented for studying the diagnosability of HFSMs that are not L1-diagnosable.
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