I xx .Fault
Modbus Master Channel Data Fault
Allen-Bradley · Compact 5000 I/O Serial Module
What does I xx .Fault mean?
This boolean tag indicates that the channel data for the Modbus master is inaccurate and cannot be trusted for use in the application. When set to 1 (Bad), it signifies an active fault condition within the module or its communication. The tag automatically resets to 0 (Good) once the underlying condition causing the inaccuracy is resolved.
Common Causes
- Module data inaccuracy due to internal processing error
- Underlying communication issue affecting data integrity on the Modbus master channel
- Misconfiguration of Modbus master parameters leading to corrupted data
Repair Steps & Checklist
Click steps to track your progress.
- 1
Troubleshoot the module to identify the specific cause of data inaccuracy affecting the Modbus master channel.
- 2
Inspect all physical serial communication cable connections at the module and Modbus slave device terminals for proper seating.
- 3
Cycle power to the module to attempt clearing any transient internal faults.
Verified technical data. Last updated: March 2026
Related Faults
Source: Allen-Bradley Compact 5000 I/O Serial Module