Permissive control of Boolean condition/event systems: synthesis and limits

This paper presents a synthesis method for logic controllers based on a discrete state model of the plant and a formal specification of the desired behavior in form of forbidden state sequences. We use Boolean condition/event systems as the basic modeling paradigm. The synthesis algorithm is specified with the help of Boolean differential calculus operators and realized using the Boolean analysis software XBOOLE. The resulting controller is permissive in the sense that it does not force state transitions in the plant. The approach is applied to a simple hatch process example which exhibits limits of a purely permissive control concept