Abstract
A discrete-event system G is modeled as the controlled generator of a formal language L( G) , in the framework of Ramadge and Wonham. By means of the concepts of well-posed language and well-posed supervisor, it is suggested how this framework can accommodate certain real-time control constraints. It is shown that in the case of centralized supervision closed-loop control has “correct” real-time behavior if and only if the supervisor is well-posed (with respect to time delay). Distributed real-time supervision is discussed in conclusion.
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