A New Tool of Surveillance for Discrete Event Systems.

In this paper, we discuss the different types of faults for discrete event systems that lead to a system malfunction, afterwards we illustrate the principle of control of discrete event systems, and at the end we present an algorithm that controls the start and the end of each action intending to ensure that each step runs are in their permitted time range, this algorithm is easy and effective to perform the proper functioning of discrete event systems.