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ErrorLib — Industrial Fault Code Library

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SV0368

SERIAL DATA ERROR(INT)

Fanuc · Alpha i Series Servo Amplifier

What does SV0368 mean?

Communications data could not be received from the built-in Pulsecoder. This indicates a failure in the serial communication link from the internal encoder to the servo system.

Common Causes

  • Loose or damaged serial communication cable between servo and internal Pulsecoder.
  • Internal Pulsecoder's serial communication IC failure.
  • Signal interference on serial data lines.
  • Corrupted firmware in the internal Pulsecoder.
  • Incorrect serial communication settings (baud rate, parity).

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect and reseat the serial cable at both servo and internal Pulsecoder ends.

  2. 2

    Measure signal levels on the internal Pulsecoder serial data lines.

  3. 3

    Test with a replacement internal Pulsecoder if available.

  4. 4

    Verify communication protocol settings in servo parameters (e.g., P1-02).

  5. 5

    Check for any physical damage to the internal Pulsecoder's communication port.

Browse all codes in this manual (101)
Verified technical data. Last updated: April 2026

Related Faults

0233Velocity Pulse Count Exceeded0243Position Pulse Count Exceeded0434Velocity Loop Integral Gain Overflow
Source: Fanuc Alpha i Series Servo Amplifier
Open Manual (Page 127)Search more codes in this manual