This paper deals with a decentralized faulttolerant
control methodology based on an Active Fault Diagnosis
approach. The proposed technique addresses the important
problem of monitoring interconnected Large-Scale Systems
(LSS). The fault diagnosis approach is made of a passive
set-based fault detection method and an active fault isolation
technique, able to guarantee isolability subject to local input
and state constraints. The proposed scheme can be implemented
locally in a decentralized way. A significant feature
is the decentralized design constructed on tube-based Model
Predictive Control to possibly allow the disconnection of faulty
subsystems or the reconfiguration of local controllers. The
Active Fault Diagnosis tool is designed to support the decision making
process for the control and monitoring of the LSS.