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FANUC Alarm FRCE-177 — F/S local memory parity error (F:…)

Manufacturer wording — F/S local memory parity error (F:%d^1)
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC FRCE-177 (“F/S local memory parity error (F:…)”): A parity error occurred on the sensor board. First check: 1. Move the robot to a safe pose. Likely part: Sensor board (Sensor interface board).

Updated 2026-09-17 · LogrobotLM reference

Description

A parity error occurred on the sensor board.

Remedy

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

Part to check / replace

FANUC FRCE-177 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-175F/S force differential limit (F:…)FRCE-176F/S shard memory parity error (F:…)FRCE-178F/S SLC2 slave data error (F:…)FRCE-179F/S SLC2 slave comm. error (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 →