231-A085

SKERN-CC%2, X%4: Comm.error during EnDat encoder dynamic sampling

Heidenhain · TNC CNC Controllers

What does 231-A085 mean?

A communication error occurred during the forced dynamic sampling of the EnDat encoder (X%4). This specific error indicates that both ignore flags were set at the same time, which is an invalid state during dynamic sampling.

Common Causes

  • Communication error during forced dynamic sampling of the EnDat encoder (X%4).
  • Both ignore flags were set simultaneously, indicating an invalid state in the encoder communication protocol.
  • Faulty EnDat encoder or encoder cable.
  • Interference on the EnDat communication line.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the EnDat encoder cable (X%4) for damage, proper shielding, and secure connections at both the encoder and controller ends.

  2. 2

    Verify the integrity of the EnDat encoder; check for physical damage or signs of malfunction.

  3. 3

    Check for sources of electromagnetic interference (EMI) near the encoder cable run.

  4. 4

    Ensure the controller's software and firmware are up-to-date and compatible with the EnDat encoder.

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Verified technical data. Last updated: March 2026

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Source: Heidenhain TNC CNC Controllers