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FANUC Alarm SRVO-331 — FB comp cnt err

Manufacturer wording — FB comp cnt err(G:%d A:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC SRVO-331 (“FB comp cnt err”): The position feedback compensation count of the pulse coder exceeded a limit value of $PLS_CMP_LIM when $PLS_ER_CHK=1. First check: Document the events that led to the error, and contact your FANUC technical representative.

Updated 2026-09-17 · LogrobotLM reference

Description

The position feedback compensation count of the pulse coder exceeded a limit value of $PLS_CMP_LIM when $PLS_ER_CHK=1.

Remedy

Document the events that led to the error, and contact your FANUC technical representative.

Related codes

SRVO-325Alarm …SRVO-330Retry count errSRVO-332Power off to reset CMALSRVO-333Power off to reset

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 →