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FANUC Alarm PRIO-494 — Modbus Active Close

Description

A Modbus TCP master device is trying to establish a connection with the robot Modbus slave, but the server is already using all available connections. This is a warning alarm and will only be posted the first time this happens after each power-cycle. Per the Modbus TCP protocol, when a new connection request arrives and there are no unused connections, the oldest connection will be closed, and the new connection request will be accepted.

Remedy · Remède

Increase the number of connections using the Modbus TCP screen.

Related codes / Codes liés

PRIO-490Modbus TCP Server ErrorPRIO-493Modbus Socket ErrorPRIO-495Modbus TimeoutPRIO-499Modbus System Error

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.