SV1068 FSSB Configuration Error (Slave) fault in Fanuc drive

SV1068 FSSB Configuration Error (Slave) fault in Fanuc drive

Description

SV1068 is an FSSB alarm detected by the Slave (Amplifier) side. It indicates that the amplifier detected a topology error in the optical ring. For example, the drive received a signal saying it should be "Axis 2", but its physical position in the chain suggests it is "Axis 1", or it received data packets intended for a different class of amplifier. It denotes a confusion in the automatic addressing assignment.

Cause

• Optical Cable Swap: The fiber optic cables are plugged into the wrong ports (COP10B vs COP10A) or routed in the wrong order between drives.
• FSSB Setting: The "FSSB Setting" screen in the CNC does not match the physical reality of the cabinet layout.
• Drive Compatibility: Mixing very old Alpha drives with new Alpha-i drives in the same optical ring without proper ordering.

Solution

1. Auto-Setting: Perform the FSSB Automatic Setting procedure in the CNC maintenance screen. This forces the CNC to query the ring and rewrite the assignment table based on what is physically connected.
2. Check Cabling: Ensure the cable goes from CNC -> Drive 1 -> Drive 2 -> End. Light goes OUT of the previous unit into the IN of the next.