IEC61131-3 programming languages

The IEC61131-3 specification defines five different programming languages and a set of common elements. All languages are optional, but at least one must be supported to claim compliance with the specification.
The programming languages are as follows:
  • Instruction list (IL) language elements
  • Structured text language (ST) elements
  • Ladder diagram (LD) language elements
  • Sequential function chart (SFC) language elements
  • Function block diagram (FBD) language elements
  • Common language elements
  • Common graphical elements
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