Rockwell Automation Logix5000 Controllers Controller Information and Status Programming Manual - Manual (Page 35)

Controller logging Chapter 3
Example: Controller Log Config Execution Get ladder instruction and configuration dialog box
The Destination tag should be of type DINT.
Log file storage
When a log file is written to the CompactFlash card, it is stored at
\Logix\XXXXXXXX\Logs\VYY_ZZ, where XXXXXXXX is the eight-digit
serial number of the controller and YY_ZZ is the revision number of the firmware
(major_minor revision).
Rockwell Automation Publication 1756-PM015F-EN-P – October 2014 35