P4022¶

Code: P4022
Message: Variable initializer type is incompatible with declared type

This error occurs when a variable’s initializer value is not compatible with the variable’s declared type. Each type in IEC 61131-3 accepts only specific kinds of literal values.

Example¶

The following code will generate error P4022:

PROGRAM main
VAR
    dummy : INT := 10.0;  (* Error: real literal cannot initialize integer type *)
END_VAR
END_PROGRAM

The literal 10.0 is a real (floating-point) value, but INT is an integer type. Real literals can only initialize REAL or LREAL variables.

To fix this error, use a literal that matches the declared type:

PROGRAM main
VAR
    dummy : INT := 10;
END_VAR
END_PROGRAM