SP0979
Incorrect Serial Spindle Amplifier Communication Sequence (15i)
Fanuc · AC Spindle Motor Alpha i-Beta i Series Parameters
What does SP0979 mean?
The communication sequence with a serial spindle amplifier for Series 15i was incorrect. This suggests a protocol mismatch or timing issue in the communication exchange.
Common Causes
- Mismatched communication protocol between CNC and spindle amplifier.
- Incorrect data framing or bit timing in serial communication.
- Software bug in the CNC or spindle amplifier communication module.
- Data corruption during transmission over the serial interface.
- Configuration error in P1-54 or related communication parameters.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Confirm the serial communication protocol specified in the amplifier manual matches parameter P1-54.
- 2
Verify data integrity by checking checksums or CRC values if supported by the protocol.
- 3
Re-initialize communication by cycling power to both CNC and spindle amplifier.
- 4
Check parameter P1-54 for correct parity, stop bits, and data bits settings.
- 5
Execute a loopback test on the serial port to verify its basic functionality.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fanuc AC Spindle Motor Alpha i-Beta i Series Parameters