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 458. Example of the error:

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

__QueryPointer(a,pt);

Message:

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

Error correction:

__QueryPointer (ITFref, pt);