Attention

IronPLC can only run very simple programs. The steps described are accurate but many language features are not yet supported.

P4013¶

This error occurs when a POU (Program Organization Unit) declaration name is duplicated within the same scope.

Example¶

The following code will generate error P4013:

FUNCTION_BLOCK MyFunction
END_FUNCTION_BLOCK

FUNCTION_BLOCK MyFunction  (* Error: Duplicate POU name *)
END_FUNCTION_BLOCK

The function block MyFunction is declared twice, which is not allowed.

To fix this error, ensure all POU names are unique within their scope:

FUNCTION_BLOCK MyFunction1
END_FUNCTION_BLOCK

FUNCTION_BLOCK MyFunction2  (* Correct: Different name *)
END_FUNCTION_BLOCK