FANUC Alarm SRVO-370 — SVON1 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-370 (“SVON1 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 the internal SVON signal of the safety board: the two internal channels no longer match.
What to check
- R-30iA: replace the panel board.
- R-30iB: full backup, then main board, then servo amplifier and emergency stop board.
- Do not reset the chain until the cause has been identified.
- Note: Board fault, never external wiring: there is no point searching at the terminal block.
Part to check / replace
FANUC SRVO-370 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 →