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. 1

    Confirm the serial communication protocol specified in the amplifier manual matches parameter P1-54.

  2. 2

    Verify data integrity by checking checksums or CRC values if supported by the protocol.

  3. 3

    Re-initialize communication by cycling power to both CNC and spindle amplifier.

  4. 4

    Check parameter P1-54 for correct parity, stop bits, and data bits settings.

  5. 5

    Execute a loopback test on the serial port to verify its basic functionality.

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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