P4002¶

Code: P4002
Message: Function invocation assigns named (formal) input that is not defined

This error occurs when a function block invocation assigns a named (formal) input that is not defined in the function block.

Example¶

The following code will generate error P4002:

FUNCTION_BLOCK Callee
VAR_INPUT
    Input1: BOOL;
END_VAR
END_FUNCTION_BLOCK

FUNCTION_BLOCK Caller
VAR
    FbInstance : Callee;
END_VAR
FbInstance(InvalidInput := TRUE);  (* Error: InvalidInput not defined *)
END_FUNCTION_BLOCK

The function block invocation references InvalidInput which is not defined in the Callee function block.

To fix this error, use only the defined input names:

FUNCTION_BLOCK Callee
VAR_INPUT
    Input1: BOOL;
END_VAR
END_FUNCTION_BLOCK

FUNCTION_BLOCK Caller
VAR
    FbInstance : Callee;
END_VAR
FbInstance(Input1 := TRUE);  (* Correct: Input1 is defined *)
END_FUNCTION_BLOCK