Author: Seyedreza Fattahzadeh- copyright 2013
Binding: E-book in PDF format would be shipped on a CD ROM
Format: PDF file
Number of pages: 70
There is a quotation which was originally stated by Confucius, I would like 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 (551–479 BCE)
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.
Well, by writing small programs to learn how to use PLC instructions is for the time you are taking an introductory course in collage to learn how to start programming a PLC to do BIG THINGS in future, BUT when you are applying for a job as a PLC programmer, the employer will NOT ASK you to write a PLC program just to “START”, and “STOP” a 3 phase electro motor, on the contrary , he will either take you to the field, show you some PLCs are busing running and controlling some process and will ask you to alter the program to suite the new needs coming soon or he will you a Functional Specification of some new system and will expect you to work on it, understand it , and if you do not have any good question to ask, TO Design and implement IT.
I have come up with a solution for those that do have the beginning knowledge on how to work with a typical PLC’s instructions BUT they need to learn how to take a Functional Specification and turn it into a working PLC control program which is controlling lots of digital and analog functional blocks now. Usually, dealing with analog functional blocks is more tedious than digital ones: you need to know exactly how to do fix the setting parameters of the analog blocks to get them function as they are supposed too. You need to work with analog and ramp amplifiers now. And in this project, it is exactly dealing with those analog function blocks to implement the controller system.
A typical dyeing machine temperature controller controls the temperature of a dyeing trough based on a typical Time/Temperature curve. See figure 1. In which, it takes the controller about 140 minutes from start of process to end and it needs to follow the given cure to control the temperature of water in a dyeing though. Controller continuously calculates SV (set value), compares it with PV (sensor value) and turns any of solenoid valve on or off to control the temperature.
Text is full of illustrated figures that show how the hardware set up to implement the project is done, and also control logic program is explained very clearly including all analog function parameter settings are indicated by lots of instructive figures.
LOGO TD which is a text display is used to enhance the project to make the application of the system easier for the operator and to give a professional look to the system panel. AN UST200 model of 0 to 20 milliamp transmitter (2 input channels) made by ORDEL is used to show the tech how a regular and yet a professional A/D is used in this sort of application.
Table of contents:
Preface, about the Author, how to use this book, Read me first.
Chapter 1:Abstract, design of a temperature controller system with a PLC, PLC contr0l method, An on-off controller, Selection of PLC, transmitter, and HMI interface hardware, problem solution, main circuit, the project description.
Chapter 2: LOGO control software program, How does a PLC computes SV value, display texts on LOGO TD HMI device, questions and answers related to this projects, Appendix a, Calculation of slop of a straight line and the formula, Appendix b, Description of some special functions.
To watch the performance of the project tested in our lab, click on the following link : http://youtu.be/mJfT4z1oCeo