Developing Programs - Rockwell Automation Allen-Bradley DriveLogix 5730 User Manual

1-6 What is DriveLogix5730?

Developing Programs

The controller operating system is a preemptive multitasking system that is
IEC 1131-3 compliant. This environment provides:
• tasks to configure controller execution
• programs to group data and logic
• routines to encapsulate executable code written in a single programming
language
control application
task 8
task 1
program 32
program 1
program (local)
main routine
fault routine
other routines
controller (global) tags
Defining tasks
A task provides scheduling and priority information for a set of one or more
programs. You can configure tasks as continuous, periodic, or event. Only
one task can be continuous. The DriveLogix5730 controller supports as
many as eight (8) tasks.
A task can have as many as 32 separate programs, each with its own
executable routines and program-scoped tags. Once a task is triggered
(activated), all the programs assigned to the task execute in the order in
which they are grouped. Programs can only appear once in the Controller
Organizer and cannot be shared by multiple tasks.
controller fault handler
tags
I/O data
configuration
status
watchdog
system-shared data