SV1067 FSSB: Configuration Error fault in Fanuc drive

SV1067 FSSB: Configuration Error fault in Fanuc drive

Description

SV1067 is a communication configuration alarm related to the Fanuc Serial Servo Bus (FSSB). FSSB is the optical fiber network that connects the CNC controller (Master) to the Servo Amplifiers (Slaves). SV1067 essentially means the CNC powered up and looked for the drives, but what it found did not match the configuration stored in its memory. It could mean it found fewer drives than expected, or the drives are in a different order. The machine will not enable any axis until the ring topology is resolved.

Cause

This is a connectivity or hardware failure in the optical ring.

• Optical Cable Break: The fiber optic cable (COP10A/COP10B) is pinched, cut, or the connector tip is scratched. Light cannot pass through.
• Dead Drive: If the first drive in the chain has a blown power supply (no control power), it cannot pass the light signal to the next drive. The chain is broken at link #1.
• Power-Up Sequence: If the 24V control power to the drives is turned on after the CNC boots up, the CNC sees "zero drives" and throws the error.
• Card Failure: The FSSB optical port on the Main CPU board is burnt out.

Solution

1. Check the Lights: Look at the optical ports on the drives. Disconnect the cable. You should see a red laser light emitting from the "T" (Transmit) port of the CNC and the drives. Warning: Do not look directly into the port. Use a piece of white paper.
2. Trace the Chain: Light goes OUT of CNC -> IN to Drive 1 -> OUT of Drive 1 -> IN to Drive 2. Find where the light stops.
3. FSSB Screen: Go to [SYSTEM] > [FSSB]. This screen will graphically show which drives are recognized. If it shows "Amp 1" but not "Amp 2", the cable between 1 and 2 is bad, or Amp 2 is dead.
4. Replace Cable: Fiber optic cables are fragile. Swap the suspected cable with a known good one.