Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 412)

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The Resources
410 DMS 3.2 EN 02/2011 TD29

8.7 Task Configuration...
8.7.1 Overview
In addition to declaring the special PLC_PRG program, you can also control the
processing of your project using the task management.
• A Task is a time unit in the processing of an IEC program. It is defined by a name, a
priority and by a type determining which condition will trigger the start of the
task. This condition can be defined by a time (cyclic, freewheeling) or by an internal
or external event which will trigger the task; e.g. the rising edge of a global project
variable or an interrupt event of the controller.
• For each task you can specify a series of programs that will be started by the task.
If the task is executed in the present cycle, then these programs will be processed
for the length of one cycle.
• The combination of priority and condition will determine in which chronological
order the tasks will be executed.
Each task can be enabled or disabled explicitly.
• For each task you can configure a watch dog (time control); the possible settings
depend on the target system.
• In the Online Mode the task processing can be monitored in a diagram.
• Additionally there is the possibility to link System events (e.g. Start, Stop, Reset)
directly with the execution of a project POU.
The Task Configuration is found as an object in the Resources tab the Object
Organizer. The Task editor is opened in a bipartited window.
Example for a Task Configuration