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Rockwell Automation Publication 1769-UM021G-EN-P - October 2015
Chapter 10
Develop Applications
Figure 39 - Elements of a Control Program
Tasks
A Logix5000™ controller lets you use multiple tasks to schedule and prioritize the
execution of your programs that are based on criteria. This multitasking allocates
the processing time of the controller among the different operations in your
application:
•
The controller executes only one task at a time.
•
One task can interrupt the execution of another task and take control.
•
In any given task, multiple programs can be used. However, only one
program executes at a time.
•
You can display tasks in the Controller or Logical Organizer views, as
necessary.
Control Application
Controller Fault Handler
Task 32
Task 1
Configuration
Status
Watchdog
Program 1000
Program 1
Main Routine
Fault Routine
Program (Local
Tags and
Parameters)
Other
Routines
Controller (global)
Tags
I/O Data
System-shared Data
Controller Fault Handler
