Compliance with IEC61131-3

The IEC61131-3 specification provides access to memory by creating named variables. It defines three 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 IEC61131-3 programming language components are defined as follows:
  • Common language elements
  • Common graphical elements
  • Structured text (ST) language elements
  • Ladder diagram (LD) language elements
  • Function block diagram (FBD) language elements
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