Compiler Error C0179

Message: '<identifier>' is no output of 'Function block'

Possible error cause: The initialization of a function block instance must not contain ‎VAR_IN_OUT‎ variables.

Error correction: Use ‎VAR_IN_OUT‎ variables in function block calls only. When initializing a function block instance, only assign the inputs of a function block.

Example of the error:

Example:
FUNCTION_BLOCK MyFB
VAR_IN_OUT
	inOut : INT;
END_VAR

PROGRAM PLC_PRG
VAR
	iValue : INT;
	fb : MyFB := (inOut := iValue);
END_VAR


--> C0179: 'inOut' is no output of 'MyFB'