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FANUC Alarm SRVO-081 — WARN EROFL alarm (Track enc:…)

Warning
Hardware
line tracking encoder
Controllers
R-J3iB / R-30iA / R-30iB
FANUC class
WARN
Hardware family
FANUC line tracking encoder alarms

Manufacturer wording — WARN EROFL alarm (Track enc:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC SRVO-081 (“WARN EROFL alarm (Track enc:…)”): The line tracking pulse count overflowed. First check: Contact your FANUC Robotics technical representative.

Updated 2026-10-22 · LogrobotLM reference

Description

The line tracking pulse count overflowed.

Remedy

Contact your FANUC Robotics technical representative.

Field diagnosis

The pulse counter of the line tracking incremental encoder has overflowed.

What to check

  • Reduce the conveyor speed, then replace the encoder, its cable, and finally the line tracking interface board.
  • Note: Check the declared reduction ratio: an encoder that turns too fast overflows without any failure.

Related codes

SRVO-082WARN DAL alarm(Track encoder:…)SRVO-090WARN DTERR alarm (Track enc:…)SRVO-097WARN Pulse not established(Enc:…)SRVO-078Servo param updateSRVO-079Stroke exceeded during pressSRVO-083WARN CKAL alarm (Track enc:…)

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 →