Decentralized diagnosis of Petri nets

In this paper we deal with the problem of failure diagnosis of discrete event systems with decentralized information. The decentralized architecture that we use is composed by a set of sites communicating their diagnosis information with a coordinator that is responsible of detecting the occurrence of failures in the system. In particular, we define two protocols that differ for the amount of information exchanged between the local sites and the coordinator, and the rules adopted by the coordinator to compute the global diagnosis states