156 Rockwell Automation Publication MOTION-UM003K-EN-P - January 2019
Chapter 7 Axis Scheduling
The Base Update Period on the Attribute tab becomes active.
After you have made all update periods in the Axis Schedule Panel, the
update period values are the same and the Base Update Period is now
active. The Alternate Update Periods are always read-only.
2. Change the Base Update Period.