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FANUC Alarm SRVO-058 — SYSTEM FSSB 1 init error

Error
Hardware
FSSB link and axis control card
Controllers
R-J3iB / R-30iA / R-30iB
FANUC class
SYSTEM
Hardware family
FANUC FSSB link, axis control card and amplifier initialisation alarms

FANUC SRVO-058 (“SYSTEM FSSB 1 init error”): An FSSB 1 communication error occurred during initialization. First check: Check the FSSB 1 hardware connection of fiber cables between the amplifier and DSP card.

Updated 2026-10-22 · LogrobotLM reference

Description

An FSSB 1 communication error occurred during initialization.

Remedy

Check the FSSB 1 hardware connection of fiber cables between the amplifier and DSP card.

Field diagnosis

FSSB bus initialization failed at power-up.

What to check

  • Amplifier fuse FS1, fiber, then a power-off test with the encoder connector (CRF8) disconnected to isolate a short-circuited Pulsecoder (ignore the resulting SRVO-068); axis control board, amplifier.
  • Power cycle to clear.
  • Note: A short-circuited encoder brings down the whole FSSB link at startup: the disconnected-connector test is decisive.

Related codes

SRVO-057SERVO FSSB disconnectSRVO-059SYSTEM Servo amp init errorSRVO-221Lack of DSPSRVO-056SERVO FSSB com error 2SRVO-060SYSTEM FSSB 2 init error

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 →