Programming Languages; Text Editors - Mitsubishi MELSEC System Q Manual

An Introduction to Programming
4.5

Programming Languages

GX IEC Developer provides separate editors for programming. You can choose between
graphical input and display of the programs and input and display as text. With the exception of
the Sequential Function Chart language, all the editors divide PLC programs into sections,
referred to as "Networks".
4.5.1

Text Editors

Instruction List (IL)
The Instruction List (IL) work area is a simple text editor with which the instructions are entered
directly. Each instruction must contain an operator (function) and one or more operands. Each
instruction must begin in a new line.
Two different types of Instruction List are used:
b IEC Instruction List
Structured Text (ST)
Structured Text is a helpful tool. Especially programmers coming from the PC world will enjoy
this tool. If they program carefully and think about the way of working by PLC, they will be glad
with this editor.
The Structured Text editor is compatible to the IEC 61131-3, all requirements are fulfilled.
MELSEC System Q Beginners Manual
Programming Languages
b MELSEC Instruction List
In a MELSEC Instruction List you can only
use the MELSEC instruction set; IEC stan-
dard programming is not possible.
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