Rockwell Automation Logix5000 Controllers Tasks, Programs, and Routines Programming Manual - Manual (Page 42)

Chapter 2 Manage event tasks
Example – Input Event Task
As parts move past a diverter location, the controller logic determines whether to
turn on the diverter. Once the diverter is on, the controller must also turn it off
before the next part is in that position. Because of the speed of the line, an event
task controls the diverter.
A photoeye at the diverter position indicates when
a part is in the diverter position. In this example
the input is wired to the module in slot 4 of the
local chassis.
The diverter photoeye (point 0) is configured
for change of state for both Off and On.
This lets the photoeye trigger the event task
when it turns on and when it turns off.
42 Rockwell Automation Publication 1756-PM005-EN-P - October 2014