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5 Understanding Programming

5-4

CJ2 CPU Unit Software User’s Manual

The entire user program is saved in a CX-Programmer project file (.CXP) with other parameters, such

as symbol tables, PLC Setup data, I/O tables, and I/O memory data.

Programs can be written using any of the following three programming languages.

• Ladder diagrams

• Structured text (ST)

• Sequential function charts (SFC)

Programs written in ladder diagrams, ST, or SFC assigned to tasks to execute them.

You can use the best language for each process by using different languages for different purposes,

such as ladder programming for the device control or ST for mathematical processing.

User Program Data

Programming Languages

.CXP

Symbol tables

PLC Setup

I/O tables

I/O memory data

CX-Programmer

project file

User program

User Program

Task

SFC:

Step Progression

Control

Ladder:

Device Control

ST:

Mathematical

Processes

Programming

Language Best

Suited to the

Process is

Selectable

a: = a + 1;

Omron CJ2 CPU UNIT SOFTWARE User Manual

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