Omron CJ2 - 02-2010 User Manual page 94

5 Understanding Programming
User Program Data
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.
User program
Symbol tables
PLC Setup
I/O tables
I/O memory data
Programming Languages
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.
User Program
Task
Task
Task
Task
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.
5-4
CX-Programmer
project file
.CXP
Ladder:
Device Control
ST:
a: = a + 1;
Mathematical
Processes
SFC:
Step Progression
Control
Programming
Language Best
Suited to the
Process is
Selectable
CJ2 CPU Unit Software User's Manual