Modular supervisory control of timed discrete-event systems
Bertil A. Brandin, Walter Murray Wonham · 2002
The timed discrete-event system framework admits disablement and forcing as means of control, as well as the treatment of hard temporal behavioural constraints. The notion of modular supervisory control of discrete-event systems proposed by Wonham-Ramadge (1988) is extended to this framework. The approach consists of dividing the overall supervisory task into two or more subtasks, with the resulting individual subsupervisors being run concurrently to implement a solution of the original control problem, if necessary under the assumption of partial observation. The design of the corresponding subsupervisors deals with issues of conflict, blocking, optimality and correctness. The results presented can be used in the development of control software for interacting concurrent processes. Based on them, experimental work (hardware and software) has been carried out on the supervision of manufacturing systems.>