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5.2 Structuring your user program is easy
A
B
①
②
③
④
You can nest the block calls for a
more modular structure.
①
②
By creating generic code blocks that can be reused within the user program, you can simplify
the design and implementation of the user program.
● You can create reusable blocks of code for standard tasks, such as for controlling a pump
● When you structure the user program into modular components that relate to functional
● Creating modular components simplifies the debugging of your program. By structuring
● Utilizing a modular design that relates to specific functional tasks can reduce the time
52
Calling block
Called (or interrupting) block
Program execution
Instruction or event that initiates the
execution of another block
Program execution
Block end (returns to calling block)
Start of cycle
Nesting depth
In this example, the nesting
depth is 4: the program
cycle OB plus 3 layers of
calls to code blocks.
or a motor. You can also store these generic code blocks in a library that can be used by
different applications or solutions.
tasks, the design of your program can be easier to understand and to manage. The
modular components not only help to standardize the program design but can also help
to make updating or modifying the program code quicker and easier.
the complete program as a set of modular program segments, you can test the
functionality of each code block as it is developed.
required for the commissioning of the completed application.
Easy Book
Manual, 05/2009, A5E02486774-01
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