3. CREATING A PLC PROGRAM
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3.2 Programming Languages
In CODESYS, you can program using the programming languages defined in IEC 61131-3
(Structured Text (ST), Ladder Diagram (LD), Function block diagram (FBD), and Sequential
Function Chart (SFC)) as well as the CODESYS proprietary language Continuous Function
Chart (CFC).
Programming languages
Description
Structured Text
Language suitable for numerical calculation and
logical expression
Ladder Diagram
Language that describes logic circuits
Function Block Diagram
Graphical language that combines multiple
functions into one
Sequential Function Chart
Language that describes the chronological order of
the control
Continuous Function Chart
Graphical programming language based on FBD
For details about each programming language, refer to the following topic in the online help.
• CODESYS Development System > Reference, Programming > Programming Languages
and their Editors
