NDLI: Formalization of PLC programs to sustain reliability

Content Provider	IEEE Xplore Digital Library
Author	Younis, M.B. Frey, G.
Copyright Year	2004
Description	Author affiliation: Kaiserslautern Univ., Germany (Younis, M.B.)
Abstract	The complexity of existing PLC programs precludes dealing with or modifying them. The interest in the formalization of PLC programs has increased in recent years to overcome this problem. Formal methods can provide for the development of PLC programs, since they serve as a medium to analyze and verify them due to increased awareness of safety and quality. This is done by performing what is known as verification and validation (V&V). Moreover formal methods support reuse of already implemented PLC programs to meet new production demands. This paper examines different possibilities to formalize PLC programs. It explains the pros and cons of these different alternatives. The paper outlines a formal description of timers and counters used in PLC programs according to the alternative that fulfills the criteria best.
Starting Page	613
Ending Page	618
File Size	1396696
Page Count	6
File Format	PDF
ISBN	0780386450
DOI	10.1109/RAMECH.2004.1437989
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-12-01
Publisher Place	Singapore
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Programmable control IEC standards Production Counting circuits Electrical equipment industry Hardware Automation Safety Computer industry Industrial control
Content Type	Text
Resource Type	Article

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