Access Denied

What does E_ACCESSDENIED mean?

The operation failed due to insufficient permissions or a locked resource. This occurs if the current document in the system manager instance is locked (e.g., when calling NewConfiguration() or OpenConfiguration()) because a reference to the system manager's object or a tree element is open. For DeleteChild(), it indicates that deleting the child item is not allowed due to protection or operational constraints.

• Attempted access to a protected function or parameter without proper credentials.
• User role or privilege level does not permit the requested operation.
• Security lockout due to repeated failed authentication attempts.
• Configuration error in access control lists (ACLs).
• Attempting to modify a read-only parameter (e.g., P3-0).

Click steps to track your progress.

1. 1

   Close any open references to the TwinCAT System Manager object or any of its tree elements.

2. 2

   Verify the TwinCAT configuration is in a modifiable state (e.g., Configuration Mode, not Runtime).

3. 3

   Check user permissions in the operating system and TwinCAT security settings to ensure write access.

4. 4

   Ensure the specific child item is not protected or actively in use by another TwinCAT process before attempting to delete it.