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Home / Technical Articles / An Introduction To SCADA For Electrical Engineers – Beginners

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.

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

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.

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Bipul Raman

Bipul Raman (@BipulRaman) is a Technology Enthusiast, Programmer and Blogger. Read more at :


  1. rajshekhar
    Nov 22, 2015

    We welcome all Automation Professionals to join ISA (

    We have a strong and vibrant section in Bangalore and ISA Bangalore Section has just received awards at the recently conducted Automation Week.
    Do contact us.


    Rajshekhar Uchil
    ISA Bangalore Section

  2. walling
    Aug 24, 2015

    Dear sir,
    I mr walling working as a ppo in moulding department in which i had done my course,
    ppt in cipet but i am not satisfying with my present work becuase i want to engage in maintainence and not as a ppo. Therefore is it helpfull by taking course on PLC repearing,SCADA to get opportunity in maintainance field,i will b very gratefull to you ,thinking you

  3. reddy sekhar
    Jun 19, 2015

    we want some other information about PLC scada

    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.

    • Satyapal
      Aug 31, 2015

      Introducing ourself as a complete scada/dcs system provider for automation in water supply system used in the department of jal nigam/sansthan. Electrical and Technologies Engineers(E&T Engineers) is a complete solution for that u want & desire. We will provide u a complete scada system for ur bid as per instruction. If u r interested plz contact 7037189489.

  5. bugdroid
    Jun 08, 2015

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

    • Kalirajan Narayanasamy
      Oct 24, 2015

      Hi Engineer

      What kind help you need.? Let me know. As i know the part ill help you on the subject layouts.

  6. Sanjeev kumar
    Jun 01, 2015

    I want more information

  7. Andrew Odihi
    May 13, 2015

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

  8. satish
    May 05, 2015

    Very useful domain….regarding plc,scada,dcs

  9. morris
    Apr 06, 2015

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

  10. 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

  11. 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

  12. bashkim
    Mar 17, 2015

    Hi do you have a scada for street lighting

  13. 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

  14. swati
    Jan 21, 2015

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

  15. 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.

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