You're reading from Learning RSLogix 5000 Programming Building PLC solutions with Rockwell Automation and RSLogix 5000

Product type Paperback

Published in Aug 2015

Last Updated in Feb 2025

Publisher Packt

ISBN-13 9781784396039

Length 224 pages

Edition 1st Edition

Languages

Python

Concepts

Programming Language

Author (1):

Austin Scott

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Table of Contents (13) Chapters

Preface

1. ControlLogix and CompactLogix Overview and Firmware

2. Industrial Network Communications FREE CHAPTER

3. Configuring Logix Modules

4. SoftLogix

5. Writing Ladder Logic

6. Writing Function Block

7. Writing Structured Text

8. Building Sequential Function Charts

9. Using Tasks and Programs for Project Organization

10. Faults and Troubleshooting in Logix

A. Rockwell Automation Literature Library Resource

Index

An introduction to structured text programming

Structured text (ST) is another IEC 61131-3 language, which can be used in your Logix applications. As the name implies, structured text is a text-based programming language with a syntax that resembles Pascal (on which it was based) or Visual Basic for Applications (VBA). Like other IEC-based languages, it can share IEC common elements and reference tags and objects created in other languages with your Logix program.

Typical usage of structured text

Structured text is extremely robust and capable of matching the functionality of any other IEC-based language. However, you will find that structured text is used sparely in most automation projects. I have seen automation projects built entirely in the structured text code and they do work fine. But, the practice of developing entirely in structured text is frowned upon by most automation professionals. Often, you will see this from an engineer who is freshly out of school and is accustomed to...