ABB Error 20477 — SC arg SMB Communication Failure

What it means · Ce que ça veut dire

SC arg SMB Communication Failure — ABB robot hardware event on the SC arg SMB Communication Failure (IRC5). Specific to this controller generation. Severity: Major. Field diagnosis below (French); your robot's own manual remains authoritative.

Safety Controller (SC) arg failed to communicate with serial measurement board (SMB). 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 SC arg SMB Communication Failure, 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.
• Make sure that the cabling from SMB to Safety Controller is connected to the right SMB connector and functional.
• Restart the robot controller.

Frequently asked · Questions fréquentes

What does ABB error 20477 mean?

ABB 20477 (“SC arg SMB Communication Failure”): SC arg SMB Communication Failure — ABB robot hardware event on the SC arg SMB Communication Failure (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 20477?

Inspect the SC arg SMB Communication Failure, 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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