Practical program validation for plant control systems using SFC and temporal logic

This paper proposes SAVE/SFC (Simulation and Varication Environment for SFC), which supports validation of sequence control programs written by an SFC (sequential function chart) for chemical plant control systems. SAVE/SFC has four characteristic features: (1) automatic generation of simulators for the process flow diagrams, (2) harmonization of conventional simulation and verification based on temporal logic model checking, and (3) suppression of state explosion based on a partial order approach. We also report the result of applying SAVE/SFC to actual chemical plants.