Rockwell Automation 1404-M4_M5_M6_M8 Powermonitor 3000 User Manual, PRIOR to Firmware rev. 3.0 - Manual (Page 132)

Publication 1404-UM001D-EN-E - October 2004
6-6 I/O Operations
Event Logging of Status Inputs
You may choose whether or not to record status input transitions in
the Event Log. If you were using a status input to read a KYZ meter
pulse, for example, recording transitions into the Event Log would
quickly fill the log and overwrite potentially important event
information. On the other hand, you may use the status input to
detect a discrete condition that you want logged. Refer to Event Log
Configuration Options on page 7-2.