FANUC Alarm PNT2-339 — Invalid tutone received
Manufacturer wording — %sInvalid tutone received
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC PNT2-339 (“Invalid tutone received”): An invalid tutone option was received from the PLC. First check: The PLC must init robot with a valid tutone option.
Updated 2026-09-17 · LogrobotLM reference
Description
An invalid tutone option was received from the PLC.
Remedy
The PLC must init robot with a valid tutone option.
Related codes
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 →