FANUC Alarm PRIO-490 — Modbus TCP Server Error
FANUC PRIO-490 (“Modbus TCP Server Error”): The Modbus TCP Server running on the robot is enabled and has an error. First check: Alarm severity and last state behavior can be modified using the Modbus TCP Slave configuration screen.
Updated 2026-08-29 · LogrobotLM reference
Description
The Modbus TCP Server running on the robot is enabled and has an error. Refer to additional cause code text for further details.
Remedy · Remède
Alarm severity and last state behavior can be modified using the Modbus TCP Slave configuration screen. Refer to the Modbus Setup and Operations Manual for more information.
Frequently asked · Questions fréquentes
- What does FANUC alarm PRIO-490 mean?
- FANUC PRIO-490 (“Modbus TCP Server Error”): The Modbus TCP Server running on the robot is enabled and has an error. Refer to additional cause code text for further details.
- How do you troubleshoot FANUC alarm PRIO-490?
- Alarm severity and last state behavior can be modified using the Modbus TCP Slave configuration screen. Refer to the Modbus Setup and Operations Manual for more information.
Related codes / Codes liés
Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. · Informations indicatives issues du terrain — le manuel du constructeur et ses procédures de sécurité font foi. Ne shuntez jamais un organe de sécurité ; consignez (LOTO) avant toute intervention physique. How this reference is built →