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.

Repair Steps

  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).

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Verified technical data. Last updated: March 2026
Source: Fanuc R-30iB Mate + Mate Plus Robot
Fanuc Error SRVO-068: Pulsecoder Serial Data Error — Troubleshooting Guide | ErrorLib