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In addition to visual programming languages, the IEC 61131-3 standard also defines the Structured Text (ST) language. Simple yet powerful constructs make structured programming of machine controllers possible.

Objectives and content

  • Structured Text features and editor functions
  • Expressions, assignments and keywords
  • Boolean and arithmetic operations
  • Comparison operators and decisions
  • State machines with the CASE statement
  • Calling functions and function blocks
  • Calling actions
  • Pointers, references and preprocessor
  • Diagnostic functions and debugging


Model number

TM246 – Structured Text (ST)



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