Standardised PLC Functionality

  • Karl-Heinz JohnEmail author
  • Michael Tiegelkamp


The IEC not only standardises the syntax of programming languages, but even goes a step further to unify the implementation of typical PLC functions, such as timers, counters or special arithmetic operations.

The standard does this by defining typical PLC functions and function blocks and describing their behaviour exactly. These elements are known as standard functions and standard function blocks respectively. Their names are reserved keywords.


Data Type Edge Detection Programming System Standard Function Structure Text 
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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  1. [IEC 61131-3]
    IEC 61131-3 Edition 2.0 (2003-01), TC/SC 65B, Programmable controllers - Part 3: Programming languages
  2. [IEC 61131-5]
    IEC 61131-5 Edition 1.0 (2000-11), TC/SC 65B, Programmable controllers - Part 5: Communications

Copyright information

© Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  1. 1.ForchheimGermany
  2. 2.PyrbaumGermany

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