On the systematic method of conditional control program execution by a PLC

The paper presents an original idea of the selective control program execution that allows significant response time reduction. The exhaustive analysis of the PLC program performance is given. An analytic approach explains the idea of the selective control program evaluation and gives the requiremen...

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Bibliographic Details
Published inBulletin of the Polish Academy of Sciences. Technical sciences Vol. 64; no. 1; pp. 161 - 170
Main Authors Milik, A., Chmiel, M., Hrynkiewicz, E.
Format Journal Article
LanguageEnglish
Published Warsaw De Gruyter Open 01.03.2016
Polish Academy of Sciences
Subjects
compiler
control program
control program optimization
flow graph
FPGA
PLC
PLC programming
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ISSN2300-1917
0239-7528
2300-1917
DOI10.1515/bpasts-2016-0018

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Summary:The paper presents an original idea of the selective control program execution that allows significant response time reduction. The exhaustive analysis of the PLC program performance is given. An analytic approach explains the idea of the selective control program evaluation and gives the requirements for its feasibility. There is presented a systematic and formal method of program analysis based on a data flow graph approach. The method generates acyclic graph from the control program that is subject of optimization, variable allocation and instruction generation. The graph approach allows determining variables dependencies and task partitioning required by selective program execution. The method utilize the hardware supported variable changes detection. It is transparent for system operation and enables evaluation of blocks that require update.
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ISSN:2300-1917
0239-7528
2300-1917
DOI:10.1515/bpasts-2016-0018