Rockwell Automation Logix5000 Controllers Tasks, Programs, and Routines Programming Manual - Manual (Page 47)

Manage event tasks Chapter 2
The Motion Group Execution trigger works as follows:
• The base update period for the motion group triggers the running of both
the motion planner and the event task.
• Because the motion planner interrupts all other tasks, it runs first. If you
assign the event task as the highest priority task, it runs immediately after
the motion planner.
This timing diagram shows the relationship between the motion planner and the
event task.
The Base Update Period for the motion group triggers the motion planner and
the event task. See the online help for more information on the Motion Group
Properties dialog box.
Rockwell Automation Publication 1756-PM005-EN-P - October 2014 47