ISPSoft User Manual

ISPSoft User Manual
The icons representing POUs are described below.
Icon
Description
The POU is a ladder diagram.
The POU is an instruction list.
The POU is a function block diagram.
The POU is a structured text.
The POU is a sequential function chart.
If the icon representing a POU is gray, the POU is disabled. A POU which is disabled
is skipped when the program is compiled, and is not executed.
If the icon representing a POU is marked with a red cross, the POU is not assigned to
any task. A POU which is not assigned to any task is skipped when the program is
compiled, and is not executed.
*. Please refer to section 5.4.2 for more information about enabling a POU. Please refer to the following section for
more information about tasks.
5.3 Tasks
Every POU of the program type is assigned to a specific task. The tasks determine the order in
which the POUs of the program type are executed or enabled. In other words, every POU of the
program type is like a basketball player, and the tasks are the roles that the POUs play.
5.3.1 Managing the Tasks in ISPSoft
In ISPSoft, not all the POUs of the program type in the project are executed. A POU of the program
type will be executed after it is assigned to a task, and the task determined how the POU is
executed. If a POU is not assigned to a task, the POU will be taken as a general source code, will be
saved with the project, and will not be translated into an execution code. Besides, only POUs of the
program type need to be assigned to tasks, and function blocks are called by POUs.
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