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Database systems for programmable logic controllers

  • Gultekin Ozsoyoglu
  • Wen-Chi Hou
  • Ade Ola
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 420)

Abstract

In this paper, we identify the database issues associated with programmable logic controllers (PLC), special-purpose computers used in scientific and industrial applications, e.g., in factories in manufacturing environments. We propose as a PLC database system a single-user, real-time, scalable main-memory-only relational database system with a two-level architecture having historical data modeling and manipulation capabilities, and query processing techniques incorporating time- and/or error-constrained query evaluation. We revise the ladder logic language, the most common PLC language, to incorporate data manipulation language instructions. We add a separate time component into the PLC processor scan time to handle database updates, backup, integrity enforcement and data archival issues.

Keywords

Query Processing Application Program Relational Algebra Host Computer Output Buffer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • Gultekin Ozsoyoglu
    • 1
  • Wen-Chi Hou
    • 2
  • Ade Ola
    • 3
  1. 1.Department of Computer Engineering and ScienceCase Western Reserve University
  2. 2.Department of Computer ScienceUniversity of Southern Illinois at CarbondaleCarbondale
  3. 3.Department of Computer ScienceUniversity of DaytonDayton

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