Creating Source Code in IEC

Source code:

“Source code” is a term used for the implementation code, which you insert in the programming modules by using the appropriate programming language editors. The following programming module types are available for this purpose: POU (Program, Function, Function Block), Action, Method, Property, Interface.

Programming Language:

When creating a POU, you define, in which programming language the implementation should be inserted. Besides the IEC languages also CFC is available.

Programming Language:Editors:

You get a programming module editable in the corresponding programming language editor on a double-click on the programming module object. So, the module will appear either in the textual ST editor or in one of the graphical editors for FBD/LD/IL or CFC. Each editor consists of two windows: In the upper window you insert the declarations, in textual or tabular form, depending on the setting. In the lower window you insert the implementation code. The display and behaviour of each editor can be configured in the corresponding tab of the CODESYSOptions dialog.

Regard the possibility to open a programming module for offline-editing even while the application is in online mode.

See also

• Programming Languages and Editors
• Command ‘Edit Object (Offline)’

• FBD/LD/IL
  • Programming Function Block Diagrams (FBD)
  • Programming Ladder Diagrams (LD)
  • Programming in Instruction List (IL)
• Continuous Function Chart (CFC)
  • Programming in CFC
• Structured Text (ST), Extended Structured Text (ExST)
  • Programming Structured Text (ST)
• Sequential Function Chart (SFC)
  • Programming the Sequential Function Chart (SFC)