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FANUC Alarm PRIO-022 — SYST Too much I/O data on I/O link

FANUC PRIO-022 (“SYST Too much I/O data on I/O link”): The devices connected to the I/O Link exceed the I/O link capacity . First check: Disconnect some devices.

Updated 2026-08-29 · LogrobotLM reference

Description

The devices connected to the I/O Link exceed the I/O link capacity . A total of 64 bytes of data each are available for input and output devices connected to the I/O link. Process I/O boards typically use 16 bytes of input and 16 bytes of output each. Digital modules generally use one byte for each 8 ports. Analog modules generally use two bytes per port

Remedy · Remède

Disconnect some devices.

Frequently asked · Questions fréquentes

What does FANUC alarm PRIO-022 mean?
FANUC PRIO-022 (“SYST Too much I/O data on I/O link”): The devices connected to the I/O Link exceed the I/O link capacity . A total of 64 bytes of data each are available for input and output devices connected to the I/O link. Process I/O boards typically use 16 bytes of input and 16 bytes of output each. Digital…
How do you troubleshoot FANUC alarm PRIO-022?
Disconnect some devices.

Related codes / Codes liés

PRIO-020STOP I/O Link comm error %x, %x, %x, %x (hex)PRIO-021SYST Unknown I/O hardwarePRIO-023WARN No ports of this typePRIO-033WARN PLC interface init. fault %d

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 →