SP0981
SIC-LSI Write Error (Spindle Amplifier Side, 15i)
Fanuc · AC Spindle Motor Alpha i-Beta i Series Parameters
What does SP0981 mean?
An error occurred when data was written to the SIC-LSI on the serial spindle amplifier side for Series 15i. This indicates a data integrity or hardware writing issue within the amplifier's communication interface.
Common Causes
- Write protection enabled on the SIC-LSI within the spindle amplifier.
- Data buffer overflow during write operations to the SIC-LSI.
- Hardware error in the SIC-LSI's write circuitry.
- Incorrect data format or command sequence for writing to the SIC-LSI.
- Power interruption during a write operation to the SIC-LSI.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Initiate a write command to a specific register and measure the bus signal response.
- 2
Verify that no other device is attempting to write to the same SIC-LSI address simultaneously.
- 3
Check parameter P7-01 for any write protection flags related to the spindle amplifier.
- 4
Send a known good data pattern to the SIC-LSI and observe the write acknowledge signal.
- 5
Ensure stable power supply to the amplifier during attempted write operations.
Verified technical data. Last updated: March 2026
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Source: Fanuc AC Spindle Motor Alpha i-Beta i Series Parameters