FANUC Alarm SRVO-371 — SVON2 status abnormal
Error- Hardware
- emergency stop and dual safety chains
- Controllers
- R-30iA / R-30iB
- FANUC class
- SERVO
- Hardware family
- FANUC emergency stop, pendant and dual safety chain alarms
FANUC SRVO-371 (“SVON2 status abnormal”): A chain alarm was detected with the panel board internal signal (SVON). First check: Replace the panel board. Likely part: Panel board (Operator panel board).
Updated 2026-10-22 · LogrobotLM reference
Description
A chain alarm was detected with the panel board internal signal (SVON).
Remedy
Replace the panel board.
Field diagnosis
Chain alarm on channel 2 of the internal SVON signal.
What to check
- Same replacement sequence as SRVO-370: panel board (R-30iA) or main board (R-30iB, after backup), then amplifier, then emergency stop board.
- Note: Rarely occurs on its own; look at the other chain codes from the same second.
Part to check / replace
FANUC SRVO-371 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 →