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FANUC Controller
Servo/Axis · Intermediate · 5-30 minutes
Fanuc 480 - Fssb hrv mode error
Alarm 480 indicates an FSSB high-speed communication mode error between the CNC and servo amplifiers. This typically occurs when there's a mismatch in communication settings, hardware incompatibility, or degraded signal quality on the FSSB network preventing proper HRV (High-Speed Responsive Vector) mode operation.
480
Fanuc 480 - Fssb hrv mode error
FSSB HRV MODE ERROR
An FSSB (Fanuc Serial Servo Bus) error has been detected related to fssb hrv mode error. The serial bus communication between the CNC and servo amplifiers is affected.
Root Cause Summary
Alarm 480 indicates an FSSB high-speed communication mode error between the CNC and servo amplifiers. This typically occurs when there's a mismatch in communication settings, hardware incompatibility, or degraded signal quality on the FSSB network preventing proper HRV (High-Speed Responsive Vector) mode operation.
Safety
- Verify corrected program or parameters before resuming machining
Causes and Fixes
- 1
Check parameter 8100 (FSSB setup) to verify FSSB is enabled and HRV mode is properly configured.
- 2
Verify parameters 8101-8104 match the actual servo amplifier model numbers and axis assignments on the FSSB network.
- 3
Compare amplifier DIP switch settings or rotary switch positions with parameter settings to ensure axis addressing matches.
Power must be OFF when checking or changing amplifier address switches.
- 4
If parameters were recently changed or amplifiers replaced, restore known good parameters or reconfigure FSSB setup and cycle power completely.
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