Control and monitoring of large discrete event systems: a generic approach (to EMS)

This paper deals with a hierarchical and modular structure for real time control and monitoring of large discrete event systems. The first aspect of these works concerns the complexity of the physical process to be controlled: the whole process is split up into more simple subproblems. This splitting up procedure is recursive and stops when the resulting subprocesses are simple enough to be solved. The resulting control structure is a tree-like structure of control subsystems in which the abstraction level of each node is decreasing from the root to the leaves. In the proposed approach, each node of the tree-like structure is not only a control system but also a control and monitoring system called a ´control and monitoring module´. In fact, each node is the root of a part of the tree-like structure and implements all the functions necessary for real time control and monitoring.