Hi friends,

In CoDeSys, user-defined functions (UDFs) and function blocks (UDFBs) are important ways to encapsulate functionality that you use often. Here's a step-by-step guide on how to create them:

User-Defined Functions (UDFs):

- Right-click on the "Application" or a "Program" in the "Device Tree" and select "Add Object" -> "Function".

- Provide a name for the function and select the programming language in which you want to write the function (Structured Text, for example).

- In the function editor, define the inputs and outputs of the function using the "VAR_INPUT" and "VAR_OUTPUT" keywords.

- Write your function logic in the main body of the function.

User-Defined Function Blocks (UDFBs):

- Right-click on the "Application" or a "Program" in the "Device Tree" and select "Add Object" -> "Function Block".

- Provide a name for the function block and select the programming language in which you want to write the function block.

- In the function block editor, define the inputs, outputs, and internal variables of the function block using the "VAR_INPUT", "VAR_OUTPUT", and "VAR" keywords.

    Write your function block logic in the main body of the function block.

After defining UDFs or UDFBs, you can call them from your other programs. This can help reduce code duplication and increase readability. Remember to always comment and document your functions and function blocks well so other developers can understand what they do.

Remember that CoDeSys supports all five IEC 61131-3 programming languages, so you can define functions and function blocks in any of these languages. However, Structured Text and Function Block Diagram are often used for defining UDFs and UDFBs because they're particularly well-suited to this task.

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