Introduction; Programming Language In Plcs; Types Of Programming Languages - Mitsubishi FX3U Series Programming Manual

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Table of Contents

Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

Introduction

This chapter explains basic items related to programming in FX

This section explains the features of programming in FX

1. List programming

This method is the basis of programs.

In this method, sequence instructions are input in the form of instruction words such as "LD", "AND" and

This input method is the basis of sequence programs.

2) Example of list display

2. Circuit programming

In this method, ladder formats are drawn on the graphic screen.

In a circuit program, a sequence circuit is drawn on the graphic screen by sequence formats and device

numbers. Because a sequence circuit is expressed with contact symbols and coil symbols, the contents

of a program can be understood easily.

In the circuit display status, the PLC operations can be monitored.

2) Example of circuit display

The above list program is expressed in

the circuit diagram.

3. SFC (STL <step ladder>) programming

This input method allows sequence design in accordance with the flow of machine operations.

In an SFC (sequential function chart) program, sequences can be designed in accordance with the flow of

machine operations.

2) Compatibility between SFC programs and other programs

SFC programs can be converted into another program format. And when list programs and circuit

programs are created according to certain rules, they can be converted inversely into SFC programs.

PLCs support the following three types of programming languages:

1.1 Programming Language in PLCs

Device number

1 Introduction

programmable controllers

Fx3uc series Melsec-f