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Introduction to PLC controllers

on-line, FREE! author: Nebojsa Matic

PLC are industrial microcontroller systems (in more recent times we meet processors instead of microcontrollers) where hardware and software are specifically adapted to industrial environment. The key to their success is the fact that you don't have to learn a new programming language to program them. How do they work exactly ? How to connect a simple sensor ? How to program in ladder diagram ? In this book you will find answers for this question and more...

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Contents:

Chapter I Operating system

Introduction
1.1 Conventional control panel
1.2 Control panel with a PLC controller
1.3 Systematic approach to designing a process control system

Chapter II Introduction to PLC controllers

Introduction
2.1 First programmed controllers
2.2 PLC controller parts
2.3 Central processing Unit –CPU
2.4 Memory
2.5 PLC controller programming
2.6 Power supply
2.7 Input to PLC controller
2.8 Input adjustment interface
2.9 PLC controller output
2.10 Output adjustment interface
2.11 Extension lines

Chapter III Connecting sensors and output devices

3.1 Sinking-Sourcing concept
3.2 Input lines
3.3 Output lines

Chapter IV Architecture of a specific PLC controller

Introduction
4.1 Why OMRON?
4.2 CPM1A PLC controller
4.3 PLC controller output lines
4.4 PLC controller input lines
4.5 Memory map for CPM1A PLC controller

Chapter V Relay diagram

Introduction
5.1 Relay diagram
5.2 Normally open and Normally closed contacts
5.3 Short example

Chapter VI SYSWIN, program for PLC controller programming

Introduction
6.1 How to connect a PLC controller to a PC
6.2 SYSWIN program installation
6.3 Writing a first program
6.4 Saving a project
6.5 Program transfer to PLC controller
6.6 Checkup of program function
6.7 Meaning of tool-bar icons
6.8 PLC controller function modes
6.9 RUN mode
6.10 MONITOR mode
6.11 PROGRAM-STOP mode
6.12 Program execution and monitoring
6.13 Program checkup during monitoring
6.14 Graphic display of dimension changes in a program

Chapter VII Examples

Introduction
7.1 Self-maintenance
7.2 Making large time intervals
7.3 Counter over 9999
7.4 Delays of ON and OFF status
7.5 Alternate ON-OFF output
7.6 Automation of parking garage for 100 vehicles
7.7 Operating a charge and discharge process
7.8 Automation of product packaging
7.9 Automation a storage door

Appendix A Expanding the number of I/O lines

Introduction
A.1 Differences and similarities
A.2 Marking a PLC controller
A.3 Specific case

Appendix B Detailed memory map for PLC controller

Introduction
B.1 General explanation of memory regions
B.2 IR memory region
B.3 SR memory region
B.4 AR memory region
B.5 PC memory region

Appendix C PLC diagnostics

Introduction
C.1 Diagnostic functions of a PLC controller
C.2 Errors
C.3 Fatal errors
C.4 User defined errors
C.5 Failure Alarm –FAL(06)
C.6 Severe Failure Alarm –FALS(07)
C.7 MESSAGE –MSG(46)
C.8 Syntax errors
C.9 Algorithm for finding errors in a program

Appendix D Numerical systems

Introduction
D.1 Decimal numerical system
D.2 Binary numerical system
D.3 Hexadecimal numerical system

Appendix E Detailed set of instructions

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To readers knowledge:

The contents published in the book "Introduction to PLC controllers" is subject to copyright and it must not be reproduced in any form without an explicit written permission released from the editorial of mikroElektronika.

The contact address for the authorization regarding contents of this book: office@mikroe.com .

The book was prepared with due care and attention, however the publisher doesn't accept any responsibility neither for the exactness of the information published therein, nor for any consequences of its application.

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PIC, PIC, PICmicro, and MPLAB is a registered and protected trademark of the Microchip Technology Inc. USA. Microchip logo and name are the registered tokens of the Microchip Technology. Copyright 2003, Microchip Technology Inc. PIC BASIC PRO is a registered trade mark of microEngineering Labs, Inc. OMRON and CPM1A are registered and protected trademarks of the OMRON Inc. All other tokens mentioned in the book are the property of the companies to which they belong.All other tokens mentioned in the book are the property of the companies to which they belong.