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FANUC Alarm SRVO-090 — WARN DTERR 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 DTERR alarm (Track enc:%d)
The manual prints placeholders; your controller fills them in with the real group, axis or number.

FANUC SRVO-090 (“WARN DTERR 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-068 DTERR 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-068 DTERR alarm.

Field diagnosis

Communication error between the line tracking encoder and its interface board.

What to check

  • Cable at both ends, shield grounding, then replacement of the cable, the encoder, the interface board.
  • Note: Same trio as on the robot axes (068/069/070).

Related codes

SRVO-091WARN CRCERR alarm (Track enc:…)SRVO-068SERVO DTERR alarmSRVO-082WARN DAL alarm(Track encoder:…)SRVO-088WARN CSAL alarm (Track enc:…)SRVO-089WARN OHAL2 alarm (Track enc:…)SRVO-092WARN STBERR 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 →