An Introduction To SCADA (Supervisory Control And Data Acquisition) For Beginners
An Introduction To SCADA (Supervisory Control And Data Acquisition) For Beginners // On photo Monitor iFIX By ServiTecno via FlickR

Control and Supervision

It is impossible to keep control and supervision on all industrial activities manually. Some automated tool is required which can control, supervise, collect data, analyses data and generate reports. A unique solution is introduced to meet all this demand is SCADA system.

SCADA stands for supervisory control and data acquisition. It is an industrial control system where a computer system monitoring and controlling a process.

Another term is there, Distributed Control System (DCS). Usually there is a confusion between the concept of these two.

A SCADA system usually refers to a system that coordinates, but does not control processes in real time, but DCS do that. SCADA systems often have Distributed Control System (DCS) components.

Components of SCADA

1. Human Machine Interface (HMI)

It is an interface which presents process data to a human operator, and through this, the human operator monitors and controls the process.

2. Supervisory (computer) system

It gathers data on the process and sending commands (or control) to the process.

3. Remote Terminal Units (RTUs)

It connect to sensors in the process, converting sensor signals to digital data and sending digital data to the supervisory system.

4. Programmable Logic Controller (PLCs)

It is used as field devices because they are more economical, versatile, flexible, and configurable than special-purpose RTUs.

5. Communication infrastructure

It provides connectivity to the supervisory system to the Remote Terminal Units.


SCADA System Concept

The term SCADA usually refers to centralized systems which monitor and control entire sites, or complexes of systems spread out over large areas (anything between an industrial plant and a country).

Most control actions are performed automatically by Remote Terminal Units (RTUs) or by programmable logic controllers (PLCs).

Host control functions are usually restricted to basic overriding or supervisory level intervention. For example, a PLC may control the flow of cooling water through part of an industrial process, but  the  SCADA system may allow operators to change the set points for the flow, and enable alarm conditions, such as loss of flow and high temperature, to be displayed and recorded.

The feedback control loop passes through the RTU or PLC, while the SCADA system monitors the overall performance of the loop.

A simple SCADA system with single computer
A simple SCADA system with single computer

SCADA/PLC Video Introduction/Example

Waste Water Treatment SCADA System Raising your Plant IQ

Cant see this video? Click here to watch it on Youtube.


Introducing students to Industrial Programmable Controllers

Cant see this video? Click here to watch it on Youtube.

About Author //

author-pic

Bipul Raman

Bipul Raman - Bipul Raman (@BipulRaman), a graduate in Electrical Engineering had presented two research papers in National Conferences. He has overtaken and successfully completed a project to design an Automated CB Test-Rig for Light Combat Aircraft at Aircraft Research and Design Center (HAL). Apart from this, he has done several projects at NTPC and Grid Substation. Not only limited to Electrical Engineering, He is also very much passionate in Software Development. He has contributed few of his code to 'Codeplex' ( a Microsoft OpenSource software hosting website ). Visit his complete profile at http://bipul.in/about

33 Comments


  1. reddy sekhar
    Jun 19, 2015

    we want some other information about PLC scada


  2. K.C.SHARMA
    Jun 17, 2015

    We have bid for providing SCADA automation system for a rural water supply project. We need to understand SCADA and locate the best in the industry SCADA providers and installers. These can be Indian or international.


  3. bugdroid
    Jun 08, 2015

    hi ! i’m prepararing for my ppt projet about SCADA and HMI .. can you help me please ??


  4. Sanjeev kumar
    Jun 01, 2015

    I want more information


  5. Andrew Odihi
    May 13, 2015

    please am just newly recruited in the SCADA dept.need more information.

  6. […] locally. This is largely due to the limited bandwidth typical of communications links between the SCADA central host computer and the field data interface […]


  7. satish
    May 05, 2015

    Very useful domain….regarding plc,scada,dcs


  8. morris
    Apr 06, 2015

    Interested in knowing more for plc and scada filed of work and studies.
    Thank you.


  9. brij kishor rai
    Mar 28, 2015

    Sir me scada ralated information and vedio in electrical engineering career growth me increased .so please help me . more information send me sir


  10. mohamed
    Mar 25, 2015

    hi frnds,

    lot’s of automation institute is there but less no of opportunities, whenever i am searching job in automation field at web portal i am facing only institute advertisement only,can u please tell me automation job portal name please suggest me.

    thank ui


  11. bashkim
    Mar 17, 2015

    Hi do you have a scada for street lighting


  12. tema
    Feb 10, 2015

    BONSOIR .. je prépare mon mémoire de fin d’étude et j’aimerai bien avoir plus d’information (en français si c’est possible ) Merci


  13. swati
    Jan 21, 2015

    sent more details about scada & plc &sir tell me even about training centres nearest to belgaum


  14. Sachin Naik
    Jan 20, 2015

    Please share more scada videos. also provide tutorial links to learn about scada and plc automation system. also please let us know how to do PLC programing.


  15. kundan singh
    Nov 15, 2014

    Sir, Can u send me more scada video tutorial links? i want to learn about scada and plc automation system.


  16. mohammad
    Nov 09, 2014

    please sent me article


  17. obari johnson
    Aug 13, 2014

    I love this
    O


  18. ADEPOJU OLUSOLA
    Jul 02, 2014

    I really enjoy the lecture and it is well understand. but i really want to no difference between RTUs and PLCs. Thanks while waiting for your respond as soon as possible.


  19. asajile
    Jun 30, 2014

    More details required


  20. Nathan Valencia
    Jun 03, 2014

    Is SCADA different to BMS? Or it is just the same?


  21. Pravin Arun Jagdale
    Apr 30, 2014

    classic information abt PLC S SCADA rather than wikipedia
    Heartly THANKS


  22. Tom Neilson
    Apr 27, 2014

    Hi,
    For some examples of what can be done with all the data that is generated by a wind farm typical SCADA system, check out http://www.scadaminer.com/applications/wind-turbine-scada-analysis/
    Regards,
    Tom


  23. MOHAMED BILAL
    Apr 01, 2014

    useful for beginners .


  24. Seta Shandolo Shabolyo
    Mar 30, 2014

    am an electrica/electronics technician and interested to study SCADA


  25. chima victor
    Mar 28, 2014

    i like this course


  26. chima victor
    Mar 28, 2014

    i like this, and am about to implement on eof its kind


  27. S NOOR MOHAMMED
    Dec 04, 2013

    I am very much passionate to do a job in scada as i completed my course in Industrial automation (plc scada hmi ), i did b.tech in electrical & electronics please send me the details regarding jobs on scada. please do the needfull.

    Thanks & regards.


  28. vivektomar1991@gmail.com
    Jun 19, 2013

    please give the detailed information and other processing processes involved in SCADA


  29. robsot
    Jun 19, 2013

    Great article! However, you need to improve on your writing skills…


    • Bipul Raman
      Jun 19, 2013

      Thanks for your kind suggestion. I will try my best to improve it.


      • thirumalesh jalli
        Jun 26, 2013

        Good article for beginners.. Thanks Mr. Bipul

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