Basics of programmable logic controllers

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Basics of programmable logic controllers

Basics of programmable logic controllers

Book title: Basics of Programmable Logic Controllers (PLCs)
Author: PLC-DOC
Binding: E-book in PDF format
Format:: PDF file
Number of pages: 83
ISBN: 978-0-983995-3-5

There is a quotation which was originally stated by Confucius, I would like to present it here as a very practical statement on how the human mind approaches the learning process:

I hear, and I forget. I see, and I remember. I do, and I understand. — Confucius

All this means is the best way to understand anything is to get your hands on it and  actually experiment with it. In computer programming this means writing many small  programs and using some kind of simulator software to test programs’ functionality. These two e-book provide both fundamental and cutting-edge coverage on PLC basics and (the second one) practice how to use a state of art of a trial simulator software to worked out 30 sample PLC related problems in the book with all solution. Many electricians, technicians and electronic engineering students seem apprehensive about PLCs and their application in industry. One of he purposes of these texts is to explain PLC basics in a plain, easy-to-understand approach so that electricians and technicians with no PLC experience will be more comfortable with their first exposure to PLCs. Half of the battle of understanding any programmable logic controller is to master the terminology of the PLC field. Basics of PLCs ebook, covers terminology, and explains the  input/output section, processor unit, programming devices, memory organization, and ladder diagrams, RELAY LADDER LOGIC (LDA) , Function Block Diagrams (FBD) and Statement List (STL) programming languages used in the majority of programmable controllers today. Many introductory examples of basic programming techniques of typical PLCs are discussed and illustrated with many graphical illustrations of  a typical PLC hardware, as well as the commonly used commands and functions.  With the variety of PLCs on the market today, it would be impossible to write a book that  explains how they all work and/or generic sense, and to cover the basic concepts of operation common to all programmable logic controllers. Many of the examples used in  the text are based on the Allen-Bradley MicroLogix family of PLCs as well as Siemens  SIMATIC S7- 200.  These two manufacturers are used as example because they have a large share of the United States PLC and Europe markets.
The summarized list of topics covered in Basics of PLC (first ebook) is as following:

Basic PLC operation, ladder diagrams, replacing hard-wired control with a PLC, MicroLogix 1500 and SIMATIC S7-200 PLCs, Discrete I/Os, Analog input and outputs, Programming Languages (LDA,FBD and STL), PLC expansion modules, understanding Controller Status indicators, I/O numbering, PLC display and HMI  units, Siemens TD200, Computer network and PROFIBUS connection, input/output and contact
programming examples, functions mostly used in PLC programming, Boolean Algebra PLC programming, Status and force functions, 3 phase motor starter program, writing motor starter circuit with a PLC, expanding the previous problem, introduction to A-B MicroLogix 1500 and SIMATIC S7-200 timers, Timer On-Delay, Timer Off-Delay and Retentive On-Delay, A-B SLC & SIMATIC S7-200 timers, A-B & SIMATIC S7-200 counters, counter definition, symbols & application examples, AS- Interface (AS-i) the Actuator Sensor Interface and more….

The best teacher, of course, is experience, and as stated previously, the only way to really understand how to program any given PLC is,to work with it. If a PLC is not available, the next best thing is to find a demo simulator software to practice writing PLC control programs using your current PC to monitor the performance of the programs.

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