Allen-Bradley 1756-L63XT, Руководство пользователя

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148 Rockwell Automation Publication 1756-UM001O-EN-P - October 2014
Chapter 10 Develop Applications
Figure 27 - Elements of a Control Program
Tasks A Logix5000 controller lets you use multiple tasks to schedule and prioritize the
execution of your programs based on criteria. This multitasking allocates the
controller’s processin time of the controller among the operations in your
application:
• The controller executes only one task at a time.
• One task can interrupt the execution of another 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.
Task 32
Task 1
Configuration
Status
Watchdog
Program 1000
Program 1
Main Routine
Fault Routine
Program (Local
Tags and
Parameters)
Other
Routines
I/O Data
System-shared Data
Controller Fault Handler
Controller (global) Tags
40012