NDLI: Proving equivalence between control software variants for Programmable Logic Controllers

Content Provider	IEEE Xplore Digital Library
Author	Ulewicz, S. Vogel-Heuser, B. Ulbrich, M. Weigl, A. Beckert, B.
Copyright Year	2015
Description	Author affiliation: Inst. for Autom. & Inf. Syst., Tech. Univ. Munchen, Munich, Germany (Ulewicz, S.; Vogel-Heuser, B.) \|\| Inst. of Theor. Inf., Karlsruhe Inst. of Technol., Karlsruhe, Germany (Ulbrich, M.; Weigl, A.; Beckert, B.)
Abstract	Automated production systems are usually driven by Programmable Logic Controllers (PLCs). These systems are long-living and have high requirements for software quality to avoid downtimes, damaged product and harm to personnel. While commissioning multiple systems of similar type, pragmatic adjustments of the software are often necessary, which results in two or more similar variants of initially identical software. For further evolution of the software, an equivalence analysis of the software's behavior is beneficial to merge divergent development branches into a single program version. This paper presents a novel method for regression verification of PLC code, which allows one to prove that two variants of a plant's software behave identically in specified situations, despite being implemented differently. For this, a regression verification method for PLC code was designed, implemented and evaluated. The notion of program equivalence for reactive PLC code is clarified and defined. Core elements of the method are the translation of PLC code into the SMV input language for model checkers, the adaptation of the coupling invariants concept to reactive systems, and the implementation of a toolchain using a model checker. The approach was successfully evaluated using the Pick-and-Place Unit benchmark case study.
Starting Page	1
Ending Page	5
File Size	361891
Page Count	5
File Format	PDF
e-ISBN	9781467379298
DOI	10.1109/ETFA.2015.7301603
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-09-08
Publisher Place	Luxembourg
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Software Automation Hardware Couplings Unified modeling language Model checking Software maintenance Manufacturing automation Formal verification Software quality
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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