Rockwell Automation Logix5000 Controllers Tasks, Programs, and Routines Programming Manual - Manual (Page 56)

Chapter 2 Manage event tasks
To trigger an event task based on data from a consumed tag, use the Consumed
Tag trigger.
Let an event trigger this task.
Let a consumed tag trigger the task.
Let this consumed tag trigger the task.
A produced/consumed tag relationship can pass an event trigger along with data
to a consumer controller. Typically, you use an Immediate Output (IOT)
instruction to send the event trigger to the consumer controller.
Consumed tag trigger
56 Rockwell Automation Publication 1756-PM005-EN-P - October 2014