1 OUTLINE
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1 OUTLINE
This manual describes program configurations, content, and method for creating programs.
For how to create, edit, or monitor programs using the engineering tool, refer to the following.
GX Works3 Operating Manual
Type of programming languages
With the FX5 series, the optimal programming language can be selected according to the application.
■Ladder diagram
When using ladder diagram, refer to the following.
Page 33 LADDER DIAGRAM
■ST language
When using ST language, refer to the following.
Page 37 ST LANGUAGE
■FBD/LD language
When using FBD/LD language, refer to the following.
Page 49 FBD/LD language
Programming language Description
Ladder diagram Ladder diagram is a graphic language that indicates circuits using contacts, coils, and others.
The ladder diagram describes logic circuits with symbolized contacts and coils for easy-to-understand
sequence control.
Structured text language (ST language) ST language is a text language that describes programs with IF statements, operators, and others.
Because operation processing that is difficult to describe in ladder diagram can be easily and briefly
described with ST language, ST language is suitable for applications requiring complicated arithmetic
operation or comparative operation. With ST language, programs can be easily described with syntax
using selective branches with conditional statements and repetition by repetitive statements in the
same way as C language.
Function block diagram/ladder diagram
(FBD/LD language)
This is a graphic language that describes a program by wiring blocks for specific processing (function
elements, FB elements), variable elements, and constant elements along with the flows of data and
signals.
You can easily create a program that may be complicated to create by using a ladder program. So you
can enhance the productivity of programs.
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