Ptxx.Fault

Channel Data Inaccurate or Faulted

Allen-Bradley · Compact 5000 Digital I/O Modules

What does Ptxx.Fault mean?

This boolean tag indicates that the channel data for Ptxx (either input or output) is inaccurate and cannot be trusted for use in the application. A tag value of '1' signifies bad data or a faulted condition. For safety modules, this can also occur if the channel is configured as 'Not Used'.

Common Causes

  • An underlying hardware fault on the specific channel Ptxx (e.g., short circuit, internal module fault, overload, field power loss).
  • The channel Ptxx is intentionally set to 'Not Used' in the module configuration (specifically for safety modules).
  • A data quality issue as reported by the module's internal diagnostics affecting the reliability of channel data.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Access Studio 5000 Logix Designer to view the module's diagnostic information and identify specific active fault conditions related to channel Ptxx (e.g., Ptxx.ShortCircuit, Ptxx.FieldPowerOff, Overload Fault diagnostic, Internal Fault diagnostic).

  2. 2

    Troubleshoot and resolve the specific underlying fault condition identified for channel Ptxx.

  3. 3

    For safety modules, verify the module configuration in Studio 5000 Logix Designer to ensure Ptxx is not intentionally set to 'Not Used'.

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Verified technical data. Last updated: March 2026

Related Faults

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