2928 E001

Status NR1/NR2 not equal

Heidenhain · NC Control

What does 2928 E001 mean?

The status of NR1 and NR2 inputs is not equal, likely due to incorrect connection of the NR2 input or an internal software error. This indicates a discrepancy in critical safety or feedback signals.

Common Causes

  • NR2 input incorrectly connected.
  • Internal software error.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the wiring of the NR1 and NR2 inputs for the affected component, ensuring NR2 is connected correctly according to the machine's electrical schematics.

  2. 2

    Inspect the physical connections for looseness, damage, or improper termination at the input terminals.

  3. 3

    Verify the software version of the NC control for any known issues or specific requirements related to NR1/NR2 input handling.

  4. 4

    Perform continuity checks on the NR1/NR2 signal lines and their corresponding safety module or input card to ensure signal integrity.

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Verified technical data. Last updated: March 2026

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