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FANUC Alarm SRVO-091 — WARN CRCERR 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 CRCERR alarm (Track enc:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC SRVO-091 (“WARN CRCERR alarm (Track enc:…)”): An error occurred during the communication between the pulse coder and the main CPU printed circuit board. First check: Refer to the description of the SRVO-069 CRCERR alarm.

Updated 2026-10-22 · LogrobotLM reference

Description

An error occurred during the communication between the pulse coder and the main CPU printed circuit board.

Remedy

Refer to the description of the SRVO-069 CRCERR alarm.

Field diagnosis

The line tracking encoder data arrives corrupted.

What to check

  • Same procedure as SRVO-090; look for a source of electrical noise along the encoder cable.
  • Note: An encoder cable routed together with the conveyor power cabling explains most line tracking CRCERR alarms.

Related codes

SRVO-090WARN DTERR alarm (Track enc:…)SRVO-069SERVO CRCERR alarmSRVO-089WARN OHAL2 alarm (Track enc:…)SRVO-092WARN STBERR alarm (Track enc:…)SRVO-093WARN SPHAL 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 →