FANUC Alarm SRVO-335 — DCS OFFCHK alarm …,…
Error- Hardware
- DCS safety inputs
- Controllers
- R-30iA / R-30iB
- FANUC class
- SERVO
- Hardware family
- FANUC DCS, main contactor and safety input alarms
Manufacturer wording — DCS OFFCHK alarm %x,%x
The manual prints placeholders; your controller fills them in with the real group, axis or number.
FANUC SRVO-335 (“DCS OFFCHK alarm …,…”): A failure was detected in the safety signal input circuit. First check: Replace the panel board. Likely part: Panel board (Operator panel board).
Updated 2026-10-22 · LogrobotLM reference
Description
A failure was detected in the safety signal input circuit.
Remedy
Replace the panel board.
Field diagnosis
The safety input drop-out test has failed: the safety input circuit of the board is faulty.
What to check
- R-30iA: replace the panel board.
- R-30iB: full backup, then main board.
- Note: Board fault; still check that no safety input is supplied from an external source.
Part to check / replace
FANUC SRVO-335 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
Same hardware involved
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 →