Delta AS Series Programming Manual page 22


User-defined variables allow you to define a variable to replace a PLC device name. This enhances the readability of
the program, and saves time when addressing the device.

The Program Organization Unit (POU) framework divides the main program into several program units, and also
replaces the traditional subroutines with functions and function blocks. The makes the framework of the program
modular and easier to manage.

Tasks manage the execution order of the programs. Tasks help you manage large-scale program development.
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