Rockwell Automation Logix5000 Controllers Tasks, Programs, and Routines Programming Manual - Manual (Page 46)

Chapter 2 Manage event tasks
To couple the running of an event task with the running of the motion planner,
use the Motion Group Execution trigger.
Let an event trigger this task.
Let the motion planner trigger the task.
This is the name of the motion group tag.
Interrupt all other tasks.
When the task is done, do not update digital outputs in the local chassis.
Motion group trigger
46 Rockwell Automation Publication 1756-PM005-EN-P - October 2014