ABB Error 90804 — Communication lost with Safety Controller

What it means · Ce que ça veut dire

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

The main computer has lost contact with the Safety Controller. The robot controller goes to SYS FAIL No operation will be possible until the fault has been corrected and the system have been restarted. 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 Communication lost with Safety Controller, 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 : This may be caused by faulty hardware.
• Make sure the Safety Controller board is properly mounted.
• Restart the system and check if the error remains.

Frequently asked · Questions fréquentes

What does ABB error 90804 mean?

ABB 90804 (“Communication lost with Safety Controller”): Communication lost with Safety Controller — ABB robot hardware event on the Communication lost with Safety Controller (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 90804?

Inspect the Communication lost with Safety Controller, 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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