Compiler error C0086

Message: No definition found for interface '<interface name>'

Possible error cause: An undefined interface is used.

Error correction: Define the interface.

Example of the error:

PROGRAM PLC_PRG 
VAR
	 inst : FB;
END_VAR


FUNCTION_BLOCK FB IMPLEMENTS XY
VAR 
END_VAR


--> C0086: No definition found for interface 'XY'

Error correction:

Example:
INTERFACE XY