ABB Error 120021 — Unexpected debug service change

What it means · Ce que ça veut dire

Unexpected debug service change — ABB robot hardware event on the Unexpected debug service change (IRC5). Specific to this controller generation. Severity: Major. Field diagnosis below (French); your robot's own manual remains authoritative.

The debug service in domain 'arg' for type 'arg' and instance ' arg' has changed but is not connected to a debug service handler. The debug service change made will not have any affect. Le texte constructeur de ce code n'existe qu'en anglais dans les manuels ABB dont il provient. Il est reproduit tel quel ci-dessus ; le manuel de votre robot fait foi.

What to check · Que vérifier

• Inspect the Unexpected debug service change, its wiring and connections first.
• Match this code against your robot's event-log timeline before swapping parts.
• Follow the French field checks below — they are the tested sequence for this fault.
• probable : The error is likely caused by an unsupported value in a loaded cfg file.
• Correct the cfg file and load again.
• 4.11 12 xxxx

Frequently asked · Questions fréquentes

What does ABB error 120021 mean?

ABB 120021 (“Unexpected debug service change”): Unexpected debug service change — ABB robot hardware event on the Unexpected debug service change (IRC5). Specific to this controller generation. Severity: Major. Field diagnosis below (French); your robot's own manual remains authoritative.

How do you troubleshoot ABB error 120021?

Inspect the Unexpected debug service change, its wiring and connections first. Match this code against your robot's event-log timeline before swapping parts. Follow the French field checks below — they are the tested sequence for this fault.

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