Rockwell Automation Publication 1769-UM021G-EN-P - October 2015 267
Develop Applications Chapter 10
The CompactLogix controller supports up to 32 tasks, only one of which can be
continuous.
A task can have up to 1000 separate Programs
per task, each with its own
executable routines and program-scoped tags. Once a task is triggered (activated),
all programs that are assigned to the task execute in the order in which they are
grouped. Multiple tasks cannot share Programs and Programs appear only once in
the Controller Organizer.
Task Priority
Each task in the controller has a priority level. The operating system uses the
priority level to determine which task to execute when multiple tasks are
triggered. A higher priority task interrupts any lower priority task. A periodic or
event task interrupts the continuous task, which has the lowest priority.
You can configure periodic tasks to execute from the lowest priority of 15 up to
the highest priority of 1. Configure the task priority by using the Task Properties
dialog box.
Figure 43 - Configure the Task Priority
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