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ErrorLib — Industrial Fault Code Library

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SRVO-221

Missing DSP Axis Card

Fanuc · R-30iB Mate + Mate Plus Robot

What does SRVO-221 mean?

A controlled axis card (DSP) corresponding to the configured number of axes is not physically mounted or detected. This indicates a hardware configuration mismatch or a faulty axis control card.

Common Causes

  • A DSP (Digital Signal Processor) axis card is missing from its designated slot in the servo drive or control system.
  • The system expects a DSP card for processing axis commands, and its absence prevents the associated axis from functioning.
  • This can occur if the card was not installed correctly, has become dislodged, or has failed and been removed.
  • Requires verifying the presence and proper seating of the DSP axis card.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check whether the set number of axes is valid; if invalid, set the correct number.

  2. 2

    Replace the axis control card with a card that corresponds to the set number of axes.

Browse all codes in this manual (53)
Verified technical data. Last updated: April 2026

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Source: Fanuc R-30iB Mate + Mate Plus Robot
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