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ErrorLib — Industrial Fault Code Library

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231-A087

SKERN-CC%2: illegal Ignore bit for EnDat forced dynamic sampling

Heidenhain · TNC CNC Controllers

What does 231-A087 mean?

This error occurs when an active ignore bit is detected outside of an EnDat forced dynamic sampling operation. This indicates an invalid state in the EnDat communication protocol or an unexpected condition related to encoder sampling, potentially affecting safety functions.

Common Causes

  • An active ignore bit was detected outside of an EnDat forced dynamic sampling.
  • Internal communication anomaly or timing issue within the controller.
  • Software glitch or corruption within the SKERN-CC module.
  • Unexpected behavior of the EnDat encoder during communication.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Restart the control system completely (power cycle the controller).

  2. 2

    If the error recurs, check the current software version of the controller and update it if a newer, more stable version is available.

  3. 3

    Inspect the EnDat encoder and its wiring for any intermittent faults or communication issues that could lead to unexpected bit states.

  4. 4

    Collect detailed diagnostic logs if available after a restart to pinpoint the exact timing and context of the ignore bit activation.

Browse all codes in this manual (47)
Verified technical data. Last updated: April 2026

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Source: Heidenhain TNC CNC Controllers
Open Manual (Page 464)Search more codes in this manual