An approach to graphical specification of real-time safety systems

The paper describes a specialized graphical language for formally specifying real time safety systems. The language architecture is designed as a transparent high-level language with a dual approach representation: to describe the functionality and for realising the timing and synchronization aspects of real time systems; a relationship is then defined between the two representations for complete system specification in a composite way. A special form of time Petri net is used to represent the time behavior. This also provides a good foundation for system analysis, especially analysis for temporal requirements of real time systems.