Rockwell Automation Logix5000 Controllers Tasks, Programs, and Routines Programming Manual - Manual (Page 19)

Manage tasks Chapter 1
At the end of a task, the controller performs overhead operations (output
processing) for the I/O modules in your system. Although these operations are
not the same as updating the modules, the output processing may affect the
update of the I/O modules in your system.
As an option, you can turn off this output processing for a specific task, which
reduces the elapsed time of that task.
Select the Disable Automatic Output Processing To Reduce Task Overhead
check box to disable the processing of outputs at the end of the task.
Configure output
processing for a task
Rockwell Automation Publication 1756-PM005-EN-P - October 2014 19