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METHOD_ADDED_TO_INTERFACE

Severity: error

An INTERFACE gained a method but a FUNCTION_BLOCK that IMPLEMENTS it doesn't declare one.

Why it matters. The compiler eventually catches this, but only when the interface is actually used. The check surfaces it at PR review so the implementer can be updated in the same PR.

Settings. No check-specific config.

Trigger.

(* before: INTERFACE IDrivable METHOD Start END_METHOD END_INTERFACE *)
(* after: gained METHOD Stop *)

FUNCTION_BLOCK FB_Pump IMPLEMENTS IDrivable
    METHOD Start ... END_METHOD
    (* no Stop method, fires *)
END_FUNCTION_BLOCK

The bot posts.

🟥 error  METHOD_ADDED_TO_INTERFACE
FB_Pump does not implement new method(s) on IDrivable: Stop
Implementing FBs must declare matching methods.

Fix. Add the missing method to every implementer, or revert the interface change.