Rockwell Automation Logix5000 Controllers Security Programming Manual - Manual (Page 53)

Securing a ControlLogix controller Chapter 5
The Controller Security Status for the controller changes to indicate that
it is secured.
Accessing a secured controller
When you try to access a controller that has been secured with the Logix 5000
CPU Security Tool and you do not have a local copy of the project file on your
computer, the application prompts you to select the proper file.
To access a secured controller, do the following.
1. On the menu bar, click Communication, and then click Who Active.
Rockwell Automation Publication 1756-PM016G-EN-P - October 2014 53