Logic controller synthesis for net condition/event systems with forbidden paths

We present a method for modelling forbidden behaviour of a plant by means of a specification in terms of forbidden paths in Net Condition/Event systems. In contrast to prior work [2] wich is based on a complete set of all reachable states and state transitions, we demonstrate that forbidden paths in the framework of Net Condition/Event systems are of local nature. By this reason it is possible to calculate locking controllers for forbidden paths without complete enumeration of the whole state space of our plant model. Furthermore, our method permits a modular way of specification modelling and controller synthesis.