5-3
5 Understanding Programming
CJ2 CPU Unit Software User’s Manual
5-1 Programming
5
5-1-1 Programming Overview
5-1 Programming
User programs are created by using the CX-programmer. Programs consist of the following parts.
•Programs
The entire user program consists of multiple programs. Each program ends with an END(001)
instruction.
• Tasks (Smallest Executable Unit)
A program is assigned to a task to execute it. (In the CX-Programmer, the task number is specified in
the properties as a program attribute.) Tasks include cyclic tasks (executed with normal cyclic pro-
cessing), interrupt tasks (executed when interrupt conditions have been completed), scheduled inter-
rupt tasks (executed at specified intervals), and the power OFF interrupt task (executed when the
power is interrupted).
• Sections
When creating and displaying programs with the CX-Programmer, the one program can be divided
into any number of parts. Each part is called a section. Sections are generally made to make the pro-
gram easier to understand.
• Subroutines and Function Blocks
In one program, you can create subroutine programs and function blocks.
5-1-1 Programming Overview
Structure of User Programs
CPU Unit
User program
Program
Program
Program
Task 1
Task 2
Task n
The user program consists of
multiple programs. Each program is
allocated to a task. Tasks are
executed in order of task numbers.
Programs are
assigned to tasks
for execution.
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