Rockwell Automation Logix5000 Controllers Controller Information and Status Programming Manual - Manual (Page 29)

Controller logging Chapter 3
Save On Demand
You can command the controller to write buffered entries to the CompactFlash
card by using a message instruction with a CIP Generic message type and a service
type of Controller Log Write To Media.
A rung of ladder logic that sends this message and the configuration of the message
instruction are shown in the following examples.
Example: Write Buffered Entries to the CompactFlash Card ladder instruction and configuration dialog box
Rockwell Automation Publication 1756-PM015F-EN-P – October 2014 29