Abstract: A device and a method for the analysis and troubleshooting of a system, based on the use of a model of the system, with application in particular in the area of industrial installations controlled by automatic control systems of the programmed or wired logic type. The method includes a stage for initialisation of the model, and a stage for the creation of a list of discordant variables whose value in the system differs from that predicted by the model. For each of the variables belonging to a discordance list, an initial list of suspect variables, suspected of having generated the discordant value, is created, and then a restricted list of suspect variables is obtained by filtration of the initial list.

Abstract: The invention relates to a device and method for classifying two-state variables of a cyclically-operating system comprising subunits. The inventive method comprises the following steps: a recording step consisting in recording dated state changes noted for each of the variables during a determined time T; a calculation step consisting in using the aforementioned dated state changes in order to determine, for each of the variables, (i) the different durations (D1) between two consecutive passages to a first state (E1) and (ii) the different durations (D2) between two consecutive passages to a second state (E2), such as to create duration lists (LD1) and (LD2); and a processing step consisting in, for each variable, comparing the different duration lists (LD1) and/or (LD2) to the different duration lists (LD1) and/or (LD2) for the other variables and the number of occurrences thereof, such as to classify said variables into groups, whereby each group corresponds to at least one of the subunits of the system.