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FANUC Alarm FRCE-449 — Exchange frequency failed (F:…)

Manufacturer wording — Exchange frequency failed (F:%d^1)
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC FRCE-449 (“Exchange frequency failed (F:…)”): An internal error has occurred. First check: 1. Turn the controller OFF, then ON again. Likely part: Sensor board (Sensor interface board).

Updated 2026-09-17 · LogrobotLM reference

Description

An internal error has occurred.

Remedy

1. Turn the controller OFF, then ON again. 2. If this alarm occurs again, go to the next step. 3. Replace the sensor board.

Part to check / replace

FANUC FRCE-449 points to the hardware below — start here before ordering.

Tap a part for every code that points to it — and verify the exact variant for your controller before ordering.

Related codes

FRCE-447Illegal B/D (F:…)FRCE-448Exchange impedance data failed (F:…)FRCE-450Unknown F/C type (F:…)FRCE-451Unknown initializing status (F:…)

Same hardware involved

FRCE-152Sensor boardFRCE-153Sensor boardFRCE-154Sensor boardFRCE-155Sensor board

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 →