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Pearl 96 pp 29-40 | Cite as

Wirtschaftliche Fehlertoleranz in Funktionsblock-konfigurierbaren Feldstationen

  • H. J. Beestermöller
  • G. Thiele
Conference paper
Part of the Informatik aktuell book series (INFORMAT)

Abstract

The tendency to design the system-software of modern Programmable Logic Controllers (PLCs) on the basis of the features of well known realtime operating systems has influenced the IEC 1131 Standard for PLCs with respect to the inclusion of an explicit task model. This is a signiflcant step towards the inclusion of fault-tolerance, e.g. tolerating the missing of task-deadlines. The constructs for exception-handling and reconßguration of modern realtime-languages, e.g. PEARL 90, are well suited for a transparent and dependable implementation of fault-tolerance mechanisms in PLCs.

On the basis of these concepts, this paper discusses solutions for the integration of fault-tolerance with respect to the function-block diagram (FBD)-language, which is of particular interest with respect to the certification of realtime-software for PLCs in safety critical systems. A prototype implementation of the PEARL-PLC will be used for the verification of the outlined mechanisms using adaptive control as typical task-scenario.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • H. J. Beestermöller
    • 1
  • G. Thiele
    • 2
  1. 1.Institut für AutomatisierungstechnikUniversität BremenBremenGermany
  2. 2.Institut für AutomatisierungstechnikUniversität BremenBremenGermany

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