084B0000

Encoder Communications Error

Omron · NJ/NX-series Machine Automation Controller

What does 084B0000 mean?

The Servo Drive received illegal or corrupted data from the encoder multiple times, exceeding a specified error threshold. This suggests a problem with data integrity during communication, possibly due to electrical interference or power issues.

Common Causes

  • Electrical noise interfering with the encoder cable data transmission
  • Contact failure of encoder signal lines
  • Physical disconnection affecting encoder data
  • Power supply undervoltage to the encoder

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Measure the power supply voltage provided to the encoder at its input terminals.

  2. 2

    Verify the integrity of all encoder signal lines by checking continuity and checking for proper termination.

  3. 3

    Visually inspect all physical cable connections between the encoder and Servo Drive for disconnection or contact failure.

  4. 4

    Verify proper grounding and shielding of the encoder cable to mitigate noise.

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Verified technical data. Last updated: March 2026

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Source: Omron NJ/NX-series Machine Automation Controller