Compiler error C0131

Message: '<value>' is not allowed as operand for 'ADR'

Possible error cause: A constant is passed as an operand to the operator ADR.

Error correction: Use only valid operands for ADR.

Example of the error:

PROGRAM PLC_PRG
VAR
	i : INT;
	pt : POINTER TO INT;
END_VAR

pt := ADR(1);


--> C0131: '1' is not allowed as operand for 'ADR'

Error correction:

Example:
pt := ADR(i);