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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
1 Introduction
1.1 Programming Language in PLCs
4. ST (structured text)
1) Features
The ST language is a text language with a similar grammatical structure to the C language.
The ST language can describe control achieved by syntax using selective branches with conditional statements
and repetition by repetitive statements in the same way as high-level languages such as the C language.
By using the ST language, you can create simple programs that are easy to understand.
5. Structured ladder
1) Features
The structured ladder language is a graphic language developed based on the relay ladder programming
technique.
The structured ladder language is a graphic language for writing programs using ladder symbols such as contact,
coils, functions, and function blocks.
Since it can be understood intuitively, it is commonly used for the sequence programming.
A circuit always starts from the bus line located on the left side.
6. FBD (Function Block Diagram)
1) Features
The FBD (function block diagram) language is a graphic language for writing programs using parts for special
processing (functions and function blocks), variables and constants.
You can create programs easily by connecting parts along the flow of data and signals, and improve the
programming efficiency.
1.1.2 Applicability of programming languages in programming software
The table below shows the applicability of programming languages in GX Works2 and GX Developer:
1.1.3 Compatibility among programs
All sequence programs created by list programming, circuit programming or SFC programming are stored in the form
of instruction words (contents at the time of list programming) in the program memory inside the PLC.
• Programs created by these three types of input methods can be converted mutually, and then displayed and edited
as shown in the figure below.
It is not possible to display or edit sequence programs created using ST, structured ladder or FBD programming by
converting them from the form of instruction words (contents at the time of list programming).
For displaying and editing such sequence programs using ST, structured ladder or FBD programming, the symbolic
information (data indicating the program configuration such as structure and labels) is required.
→ Refer to the GX Works2 Version 1 Operating Manual (Common) for the details on symbolic information.
Programming Language GX Works2 GX Developer
List programming –
Circuit programming
SFC programming
ST –
Structured ladder/FBD –
Circuit SFC
List