084B0000 hex

Encoder Communications Error

Omron · NJ/NX-series Machine Automation Controller

What does 084B0000 hex mean?

Illegal data was received from the encoder a specified number of times, indicating corrupted or invalid communication signals. This can be caused by noise, signal line issues, or insufficient power to the encoder, leading to inaccurate position data.

Common Causes

  • Noise into the encoder cable.
  • Contact failure of the signal line, and disconnection of the encoder.
  • Power supply undervoltage to the encoder.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the encoder cable for physical integrity and secure connections.

  2. 2

    Measure the power supply voltage to the encoder to confirm it is within specified limits.

  3. 3

    Implement noise countermeasures on the encoder cable to reduce interference.

  4. 4

    Verify the integrity of the encoder's signal lines.

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Verified technical data. Last updated: March 2026

Related Faults

Source: Omron NJ/NX-series Machine Automation Controller