View source for OpenPLC-with-LDmicro/C2/Overview-of-OpenPLC-with-LDmicro/English



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|| '''VISUAL CUE'''
|| '''NARRATION''' 
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|| Slide 1:
|| Welcome to the Spoken Tutorial on '''Overview of OpenPLC with LDmicro.'''
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|| Slide 2: Learning Objectives
|| In this tutorial, we will learn about
*'''PLC'''
* '''OpenPLC''' and '''LDmicro''' 
*Features of '''OpenPLC'''
*What you can expect in this series
*The content available in various tutorials in this series
*How to use the '''Code files''' given in each tutorial
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|| Slide 3: System Requirements
|| To record this tutorial I’m using
*'''Ubuntu Linux''' 18.04 operating system
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|| Slide 4: Pre-requisites
|| To follow this tutorial you should have the basic knowledge of
*'''Electronics''' and
*'''PLC'''
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|| 
||First let us understand '''PLC'''.
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|| Slide 5(a):

Introduction to PLC:
|| 
*'''PLC''' stands for '''Programmable Logic Controller.'''
*'''PLC''' is an industrial '''digital computer'''. 
*It is used for the automation of various '''electro-mechanical''' processes.

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|| Slide 5(b):

Introduction to PLC:
||
*A  '''PLC program'''  is usually written on a  '''computer'''  and then it is downloaded to the  '''controller''' .
*'''PLC '''is programmed using special programming languages like''' ladder logic, function blocks''' etc.

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|| Slide 6:

Embedded devices vs PLC

|| 
*Now you may ask, “Why not use '''embedded devices''' for these processes?”
*'''PLCs''' are designed to be shock-resistant, suitable for harsh environments.
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|| 
|| Now we will learn about '''OpenPLC'''.
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|| Slide 7:

About OpenPLC 
|| 
*'''OpenPLC''' is an affordable '''open source hardware''' developed at''' IIT Bombay''' by the '''FOSSEE''' team.
*It is designed to get hands-on '''PLC programming''' experience at an affordable cost.
*'''OpenPLC''' can be programmed using '''ladder logic'''. 
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|| 
|| Now we will learn about '''LDmicro'''
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|| Slide 8:

About LDmicro
|| 
*'''LDmicro''' is an '''open source software'''.
*It is used to draw '''ladder diagrams''' and generate '''.hex '''files for '''OpenPLC'''. 
*'''LDmicro''' was available only for '''Windows''' initially.
*The '''FOSSEE''' team from '''IIT Bombay''' ported it and made it available for '''Linux OS '''also.

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||Open web browser >> type openplc.fossee.in
|| Let us go to the '''OpenPLC website''' developed by the '''FOSSEE''' team.

Please go through the '''website''' for detailed information on '''OpenPLC'''.

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||Homepage
||In the''' Home page''' we can read more information about '''PLC''' and the motive behind '''OpenPLC'''.
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||Resources page
||The '''Resources''' page has '''git repository links''' for '''hardware''' designs and '''LDmicro source code'''.
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||Downloads page
||The '''Downloads''' page has links to download '''LDmicro, AVRDUDE '''and''' USBasp drivers.'''
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|| Slide 9:

Features of OpenPLC
|| '''Features of OpenPLC'''
*'''OpenPLC''' has all the capabilities of an industrial '''PLC''' and is simpler to work with.
*It is a '''modular hardware'''.
*It uses '''ladder logic programming''', which is one of the easiest and efficient.
*For example, it can be interfaced with '''electronic modules''' like '''relay modules''' etc. 
*These are readily available in the market. 
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|| Slide 10:

What can you expect in this series?

|| What can you expect in this series?
*Each tutorial is demonstrated with simple experiments using '''instructions''' of '''LDmicro'''.
*'''LDmicro''' has a '''simulation''' feature.
*It allows us to check the code before uploading it on to the '''OpenPLC''' '''Mainboard'''.
*This is helpful to avoid any '''hardware''' damage.
*Once we are sure that the '''logic''' is working, we can '''compile''' the '''logic'''.
*That is to generate the '''.hex file''' for the same in '''LDmicro''' to upload it to '''OpenPLC Mainboard'''.
*In this series, we have used some custom '''modules''' such as
** '''Traffic Light module'''
** '''Switchboard module'''
** '''Heater module'''
*Using these '''modules''' we will check the working of the '''ladder logic''' that we have created on '''hardware'''.

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|| Slide 11: 

Who can use OpenPLC?
|| '''OpenPLC''' can be used by anyone who is interested in '''PLC programming'''.

For example:
*'''Polytechnic, Engineering''' and other '''technical''' students
*Any '''hardware''' professional
*Individuals who are interested in hands-on experimentation. 

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|| 
|| Now, we will briefly go through the individual tutorials in this series.
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|| Show Installation tutorials of windows and Linux
|| The first two tutorials in this series explains-

*How to '''install LDmicro''' on''' Ubuntu Linux OS''' and '''Windows OS.'''
*How to '''install AVRDUDE''' and '''USBasp drivers. '''

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|| Introduction to LDmicro

Simulation and Compilation

OpenPLC Mainboard

Programming OpenPLC
|| Next four tutorials are about
*How to navigate and create a '''ladder diagram '''in '''LDmicro'''.
*How to '''simulate''' and '''compile''' that '''ladder diagram''' in '''LDmicro'''.
*About '''OpenPLC Mainboard''' and
*How to '''program''' it with the''' ladder diagram''' created.
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|| OpenPLC Traffic Light and Switchboard Modules
|| Then we will learn about
*'''OpenPLC Traffic Light module''' and '''OpenPLC Switchboard module '''and
*How these '''modules''' can be interfaced with '''OpenPLC Mainboard.'''

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|| Normal Coil

Normal Contact 

Negated Coil & Negated Contact
|| In the next four tutorials, 

*We will learn about the most basic instructions of''' ladder logic, Contacts and Coils.'''
*We will learn about the working of '''Normal Coil, Normal Contact, Negated Coil and Negated Contact'''
*These are explained with simple examples using '''switch''' and '''LED'''.

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|| Implementing NOT & AND logic gates

Implementing OR & XOR logic gates

Internal Relay & Output pin

SET & RESET Coils
|| After this, we will learn
*How to implement basic '''logic gates''' like '''NOT, AND, OR and XOR '''using''' Contacts and Coils.'''
*Also about '''Internal relay''' and '''Output pin'''
*Working of the '''SET''' and '''RESET Coils'''. 

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|| 
|| All the above topics are covered under the '''Basic level'''.

Next comes the '''Intermediate level''' tutorials.
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|| One shot instructions

Arithmetic instructions

Move instructions

Compare instructions
|| Here we will learn about
# '''One shot instructions'''
# '''Arithmetic instructions'''
# '''Move instruction '''and
# '''Compare instructions'''

We will learn about the importance of '''cycle''' time and how to create a '''virtual counter'''.
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|| TON & TOFF Instructions

RTO Timer Instruction
|| 
*Next we will learn about the different types of '''timers''' available in '''LDmicro'''.
*The difference between each '''timer,''' particularly between '''TON and RTO'''.
*Also we will learn when to use '''RESET''' instruction.

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|| CTU Counter

CTD Counter

CTC Counter
|| 
*After that we will learn about the different types of '''counters''' available in '''LDmicro'''.
*We will learn how to create '''up-down counter''' using '''CTU and CTD counters.'''

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|| OpenPLC Heater module

AD Converter Read Instruction

PWM Instruction
|| 
*Next we will learn about the working of '''OpenPLC Heater module.'''
*How it can be used to learn some '''analog''' instructions available in '''LDmicro'''.
*One of the instructions is''' A to D converter read'''.
*As an example we will try to regulate the temperature of the '''resistor''' on the''' Heater module. '''
*Then we will learn about '''PWM''' instruction by controlling the speed of the fan on the '''Heater module.'''

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|| Slide 12: How to use the Code Files?
|| How to use the Code files?
*Code files are available in the '''Code files''' link of that particular tutorial.
*The '''.ld '''file can be accessed by opening them in '''LDmicro''' using '''‘Open’''' option under '''‘File’''' menu.
*The '''ladder diagram''' can then be '''compiled''' to generate a '''.hex''' file.
*Or you can download the''' .hex''' file from '''Code files''' which can be uploaded to the '''Mainboard''' directly.
*It is not recommended to download the '''Code files''' without understanding the working.
*Follow all the steps as shown in each tutorial and understand the working of each instruction.
*It is the better way of learning.
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||
|| This brings us to the end of this tutorial. 

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Let us summarize.
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|| Slide 13: Summary

|| In this tutorial, we have learnt about
*'''PLC'''
* '''OpenPLC''' and '''LDmicro''' 
*Features of '''OpenPLC'''
*What you can expect in this series
*The content available in various tutorials in this series
*How to use the '''Code files''' given in each tutorial

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|| Slide 14:

About Spoken Tutorial project
|| The video at the following link summarizes the Spoken Tutorial project.

Please download and watch it
|- 
|| Slide 15:

Spoken Tutorial workshops
|| The''' Spoken Tutorial Project''' team conducts workshops using spoken tutorials and
*gives certificates on passing online tests.

For more details, please write to us.
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|| Slide 16:

Answers for THIS Spoken Tutorial
|| 
*Do you have questions in THIS Spoken Tutorial?
*Please visit this site.
*Choose the minute and second where you have the question.
*Explain your question briefly.
*The Spoken Tutorial project will ensure an answer.
*You will have to register to ask questions.
|- 
|| Slide 17:

Forum for specific questions:
|| 
*The Spoken Tutorial forum is for specific questions on this tutorial.
*Please do not post unrelated and general questions on them.
*This will help reduce the clutter.
*With less clutter, we can use these discussions as instructional material.
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|| Slide 18:

Forum for specific questions:
|| 
* Do you have any general / technical questions on OpenPLC?
* Please visit the FOSSEE forum and post your question.

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|| Slide 19:

Acknowledgement
|| Spoken Tutorial Project is funded by MHRD, Government of India.
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|| Slide 20:

Thank you slide
|| This tutorial has been contributed by FOSSEE and Spoken Tutorial Project, IIT Bombay.
And this is Harsha Priyanka from FOSSEE team, signing off.
Thanks for watching.
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