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Compiler error C0141dl-permalink__symbolPermalink

Message: Reference assign needs variable with write access

Possible error cause: A constant is assigned to the reference assignment.

Error correction: Assign a writable variable.

Example of the error:

PROGRAM PLC_PRG
VAR
	i : INT;
	I_r : REFERENCE TO INT;
END_VAR

I_r REF= 314;

--> C0141: Reference assign needs variable with write access

Error correction:

Example:
I_r REF= i;