If you do not select a Global Variable Group, the variables are added
to the Common Variables group by default.
Associating a program to a task
Tasks determine the time scheduling of the programs associated with
them. This means that programs have to be associated to tasks in
order to be executed. The settings of the task determine the time
scheduling.
To create a task and associate a program
1. Click IEC Programming Workspace from the toolbar.
2. From the Project Tree Window, under Physical Hardware, right-click
Task and select Insert > Task.
3. Enter the Name.
Task name and Instance name must start with a letter or an
underscore. The rest of the characters can be letters, numbers or
underscores. The maximum quantity of characters which a task
name can have is 7 and that of a program instance is 24.
4. Select the Task type. See the following table for the descriptions of
task types.
Task type Description
DEFAULT Each resource can contain one default task. It is the
task with the lowest priority (lower than cyclic tasks)
and is not time scheduled.
CYCLIC Cyclic task executes their associated programs in
fixed time intervals.
EVENT Event task executes their associated programs each
time a particular event occurs.
SYSTEM System task executes its associated programs each
time a particular system event occurs.
5. Click OK.
6. Configure the parameters as required in the Task settings dialog.
Depending on the associated task type, only some of the
parameters are available.
7. Click OK. The new task is inserted.
8. Right-click the task you have inserted, and select Insert > Program
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Chapter 4 - Software
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