Chxx.Uncertain

Channel Data Uncertain (5069-IF8, 5069-OF4/K/8)

Allen-Bradley · Compact 5000 I/O Analog Modules

What does Chxx.Uncertain mean?

This boolean tag indicates that the channel data for a specific channel (xx) can be inaccurate but the degree of inaccuracy is not known. A value of 1 means the data is uncertain. The tag automatically resets to 0 once the underlying condition is resolved.

Common Causes

  • Data signal slightly outside the channel operating range
  • Channel (Chxx) is slightly over temperature
  • Invalid sensor offset value configured for the channel
  • Calibration fault on the channel
  • Calibration is currently in process on the channel

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the data signal for channel (Chxx) is within the specified channel operating range.

  2. 2

    Check the module's operating environment temperature and the channel (Chxx) temperature for any slight over-temperature conditions.

  3. 3

    Review the sensor offset value configured for channel (Chxx) in the module configuration.

  4. 4

    Check the calibration status of channel (Chxx) in the Logix Designer application.

  5. 5

    Wait for any ongoing calibration process on channel (Chxx) to complete.

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Verified technical data. Last updated: March 2026

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Source: Allen-Bradley Compact 5000 I/O Analog Modules