Software Design Patters in IEC 61131–3 Systems: A Case Study

Software design patterns have matured to be an standard tool in mainstream software engineering. They have however not found their way into the industrial
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domain, where a lot of the software is implemented in IEC 61131-3 languages. This paper builds on an existing body of knowledge to identify software design patterns in two automation system case studies. The patterns, which were identified are discussed and evaluated under the aspects of code quality, reusability and usefulness for documentation.