Regression Verification for Programmable Logic Controller Software

Bernhard Beckert, Mattias Ulbrich, Birgit Vogel-Heuser, Alexander Weigl

Abstract: Automated production systems are usually driven by Programmable Logic Controllers (PLCs). These systems are long-living – yet have to adapt to changing requirements over time. This paper presents a novel method for regression verification of PLC code, which allows one to prove that a new revision of the plant’s software does not break existing intended behavior.