Compiler error C0240

Message: First Operand of __QueryPointer must be an interface reference or the instance of a function block

Possible error cause: Incorrect operands are passed to the operator ‎__QueryPointer‎.

Error correction: Pass an interface reference or the instance of a function block.

Example of the error:

PROGRAM PLC_PRG
VAR
	a : INT;
	ITFref : ITF;
	pt : POINTER TO FB;
END_VAR

__QueryPointer(a,pt);

--> C0240: First Operand of __QueryPointer must be an interface reference or the instance of a function block

Error correction:

Example:
__QueryPointer (ITFref, pt);