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Introduction to IEC 61131-3 programming

Appendix

DDS-IEC61131 EN 2.0

ST Abbreviation for Structured Text.

Standard functions All functions predefined by IEC 61131-3 to implement PLC t ypical functionality.

Standard organization units See Standard function blocks

Standard function blocks All function blocks (Function Blocks) predefined by IEC 61131-3 to implement PLC typical f unctionality.

Structured Text Structured Text (Structured Text) is a programming language to describe algorithms and execution control

by means of the latest high languages.

Task Definition of run time features of a program.

Transition Transition from one SFC step to the next by evaluation of the transition condition.

Type definition Definition of a user-specific data type based on already existing data types.

Variable Name of a data memory which can contain values determined by the data type or variable declaration.

Cycle The cy cle of a (periodically called) user program.

Cycle time The cycle time is the time needed by the user progam for a cycle.

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