Rockwell Automation Logix5000 Controllers Controller Information and Status Programming Manual - Manual (Page 34)

Chapter 3 Controller logging
Example: Controller Log Config Execution Set ladder instruction and configuration dialog box
The Source Element should be of data type DINT.
You also use a message instruction to retrieve the current value of this
configuration. This message uses a message type of CIP Generic and a service type
of Controller Log Config Execution Get.
The following rung of ladder logic shows how to send the message instruction,
followed by the configuration dialog box of the message instruction.
34 Rockwell Automation Publication 1756-PM015F-EN-P – October 2014