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ErrorLib — Industrial Fault Code Library

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SRVO-068

Pulsecoder Serial Data Error

Fanuc · R-30iB Mate + Mate Plus Robot

What does SRVO-068 mean?

The serial Pulsecoder fails to return serial data in response to a request signal. This indicates a communication fault between the servo amplifier and the Pulsecoder, potentially due to loose connections, damaged cabling, or a faulty Pulsecoder itself.

Common Causes

  • Interruption in serial communication between the servo controller and pulsecoder.
  • Damaged pulsecoder serial data cable or connectors.
  • Faulty pulsecoder unit reporting invalid serial data.
  • Noise interference on the serial communication lines (e.g., P1-31, P1-32).
  • Incorrect pulsecoder communication protocol settings.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the robot connection cable (RMP1, RP1) connector (CRF8) on the 6-Axis servo amplifier and the connector on the motor side are tightly connected.

  2. 2

    Check that the shielding of the robot connection cable (RMP1, RP1) is securely grounded in the cabinet.

  3. 3

    Replace the Pulsecoder.

  4. 4

    Replace the servo amplifier.

  5. 5

    Replace the robot connection cable (RMP1, RP1, RM1).

  6. 6

    Replace the internal cable of the robot (for the Pulsecoder, or for the Motor).

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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