File Owner Active - File In Use

What does F01A mean?

This fault indicates that a requested file is currently being accessed or used by another application or process. This prevents the current operation from modifying or deleting the file until it is released.

• Another software application currently has the file open for editing.
• The file is locked by an operating system process.
• Network share conflict if the file is on a shared drive.

Click steps to track your progress.

1. 1

   Inspect the PLC's diagnostic buffer and error logs for detailed information regarding the specific file or resource generating the F01A fault.

2. 2

   Review the PLC program logic, including all routines and tasks, to identify any concurrent attempts to access or modify the identified file or data by different parts of the program.

3. 3

   Verify if any external systems (e.g., HMI, SCADA, other network clients) are actively reading from or writing to the same file or data area within the PLC at the time of the fault.

4. 4

   Check for any incomplete or hung file transfer operations that may have left the file locked in an 'in-use' state.

5. 5

   Perform a controlled power cycle or mode change (e.g., to Program mode then back to Run mode) on the PLC to clear transient software locks, ensuring all safety precautions are met.