三菱Structured Text(ST)编程指南.pdf

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Programming Guide Book Programming Guide Book

Mitsubishi Programmable

Logic Controller

MODEL

CODE

ST-GUIDE-E

13JF69

SH(NA)-080368E-A(0302)MEE

Structured Text(ST)Structured Text(ST)

Specifications subject to change without notice.

When exported from Japan, this manual does not require application to the

Ministry of Economy, Trade and Industry for service transaction permission.

HEAD OFFICE : 1-8-12, OFFICE TOWER Z 14F HARUMI CHUO-KU 104-6212,JAPAN

NAGOYA WORKS : 1-14 , YADA-MINAMI 5 , HIGASHI-KU, NAGOYA , JAPAN

A - 1 A - 1

•

SAFETY PRECAUTIONS

•

(Always read these instructions before using this equipment.)

Before using this product, please read this manual and the relevant manuals introduced in this manual

carefully and pay full attention to safety to handle the product correctly.

The instructions given in this manual are concerned with this product. For the safety instructions of the

programmable controller system, please read the CPU module user's manual.

In this manual, the safety instructions are ranked as "DANGER" and "CAUTION".

DANGER

CAUTION

Indicates that incorrect handling may cause hazardous conditions,

resulting in death or severe injury.

Indicates that incorrect handling may cause hazardous conditions,

resulting in medium or slight personal injury or physical damage.

Note that the

CAUTION level may lead to a serious consequence according to the circumstances.

Always follow the instructions of both levels because they are important to personal safety.

Please save this manual to make it accessible when required and always forward it to the end user.

[Designing Precautions]

DANGER

•

For data change, program change and status control to be performed for the running

programmable logic controller from a personal computer, configure interlock circuits in the

outside of the PLC system so that the whole system will always operate safely.

Also, for online operations to be performed from the personal computer to the PLC CPU,

predetermine as a system the corrective actions for communication errors that will occur due to

poor cable connection, etc.

[Startup/Maintenance Precautions]

CAUTION

•

Before performing online operations (program change during PLC CPU RUN, forced I/O

operation, RUN-STOP or similar operating condition change, remote operation) with the

personal computer connected to the running PLC CPU, read the manual carefully and ensure

safety fully.

Note that program change during PLC CPU RUN (online change) may cause such problems as

program corruption depending on the operation condition. Use the equipment after fully

understanding the precautions given in the GX Developer Operating Manual.

A - 3 A - 3

INTRODUCTION

Thank you for choosing the Mitsubishi MELSOFT series Integrated FA software.

Read this manual and make sure you understand the functions and performance of MELSEC series

sequencer thoroughly in advance to ensure correct use.

Please make this manual available to the end user.

CONTENTS

SAFETY PRECAUTIONS...............................................................................................................................A- 1

REVISIONS.....................................................................................................................................................A- 2

CONTENTS.....................................................................................................................................................A- 4

About Manuals ................................................................................................................................................A- 5

How to Use This Manual.................................................................................................................................A- 6

Abbreviations and Generic Terms in This Manual.........................................................................................A- 7

1 OVERVIEW 1- 1 to 1- 2

2 ST PROGRAM CREATION PROCEDURE 2- 1 to 2- 2

3 ST PROGRAMMING 3- 1 to 3- 16

Creating a new ST project .............................................................................................................................. 3- 1

Defining the labels........................................................................................................................................... 3- 3

Entering a program.......................................................................................................................................... 3- 8

Converting (compiling) the ST program ........................................................................................................ 3-14

4 READ/WRITE FROM/TO PLC CPU 4- 1 to 4- 2

5 DEBUGGING THE PROGRAM 5- 1 to 5- 7

5.1 Monitoring the Sequence Program........................................................................................................... 5- 1

5.2 Device Test................................................................................................................................................ 5- 2

5.3 Online Change .......................................................................................................................................... 5- 4

6 SAVING THE PROGRAM INTO THE PERSONAL COMPUTER 6- 1 to 6- 2

7 INTRODUCTION TO USEFUL FUNCTIONS FOR ST PROGRAM EDITING 7- 1 to 7- 2

A - 4 A - 4

8 ST PROGRAMMING APPLICATION (PASTING FB TO LADDER PROGRAM) 8- 1 to 8- 20

8.1 Creating an FB .......................................................................................................................................... 8- 1

Creating a new project .............................................................................................................................. 8- 1

Adding a new FB ....................................................................................................................................... 8- 2

Defining FB variables ................................................................................................................................ 8- 5

Creating an FB in ST language ................................................................................................................ 8- 9

8.2 Pasting the FB to a Main Program .......................................................................................................... 8-11

Defining the local variables ......................................................................................................................8-11

Creating a main program .........................................................................................................................8-13

8.3 Online .......................................................................................................................................................8-16

Writing to PLC CPU.................................................................................................................................. 8-16

Monitoring the sequence program...........................................................................................................8-17

Confirming the program behavior ............................................................................................................ 8-18

Index Index- 1 to Index- 2

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