Programming Languages and Editors

You program a POU in each case in the editor for the implementation language that you selected when creating the POU. CODESYS offers a text editor for ST and graphic editors for SFC, FBD/LD/IL and CFC.

The editor opens with a double-click on the POU in the device tree or in the POUs view.

Each of the programming language editors consists of two sub-windows:

• In the upper part you make declarations in the “declaration editor”, in text or tabular form depending on the setting.
• In the lower part you insert the implementation code in the respective language.

You can configure the display and the behavior of each editor project-wide on the associated tab of the CODESYS options.

• Declaration Editor
• Common Functions in Graphical Editors
• Structured Text and Extended Structured Text (ExST)
  • ST Editor
  • ST Editor in Online Mode
  • ST Expressions
  • Assignments
  • Instructions
• Sequential Function Chart (SFC)
  • SFC Editor
  • SFC Editor in online Mode
  • Processing Order in SFC
  • Qualifiers for Actions in SFC
  • Implicit Variables
  • SFC Flags
  • Elements
• Function Block Diagram / Ladder Diagram / Instruction List (FBD/LD/IL)
  • FBD/LD/IL Editor
  • FBD/LD/IL Editor in Online Mode
  • Modifiers and Operators in IL
  • Elements
• Continuous Function Chart (CFC) and Page-Oriented CFC
  • CFC Editor
  • CFC Editor
  • CFC Editor, Page-Oriented
  • CFC Editor in Online Mode
  • Elements