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. 1

    Initiate a write command to a specific register and measure the bus signal response.

  2. 2

    Verify that no other device is attempting to write to the same SIC-LSI address simultaneously.

  3. 3

    Check parameter P7-01 for any write protection flags related to the spindle amplifier.

  4. 4

    Send a known good data pattern to the SIC-LSI and observe the write acknowledge signal.

  5. 5

    Ensure stable power supply to the amplifier during attempted write operations.

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Verified technical data. Last updated: March 2026

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Source: Fanuc AC Spindle Motor Alpha i-Beta i Series Parameters