LogrobotLM

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FANUC Alarm PRIO-623 — PNIO(C) not in operation mode

FANUC PRIO-623 (“PNIO(C) not in operation mode”): The start up of I/O Controller has completed but the start up mode is not OPERATION. First check: Change the start mode to OPERATION, and cycle power on the robot controller.

Updated 2026-09-17 · LogrobotLM reference

Description

The start up of I/O Controller has completed but the start up mode is not OPERATION.

Remedy

Change the start mode to OPERATION, and cycle power on the robot controller.

Related codes

PRIO-621PNIO(D) device is not runningPRIO-622PNIO(C) controller is not runningPRIO-624PNIO(C) mod number mismatchPRIO-625PNIO(C) read in complete

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. How this reference is built →