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What is SCADA?

SCADA, created with the initials of the words Supervisory Control and Data Acquisition; It is called “centralized control, control and data collection” system.


SCADA system is a system that can monitor large facilities from a single center via computers, mobile phones or tablets. It is basically software. It can be used from a single device as well as controlled and monitored by multiple networked computers and portable devices.

Main Features of SCADA Systems

  • Graphical Interface
  • Monitoring System
  • Alarm system
  • Data Collection, Analysis and Reporting Systems.

SCADA consists of three basic parts;

  • Remote Terminal Unit (RTU)
  • Communication System
  • Control Center System (Main Control Center AKM – Master Terminal Unit MTU)

Communication Protocols

Protocol Many devices used in industrial applications use EIA standards RS-232, RS-422 and RS-485 to connect to computers or each other.

Control Units

Control unit Main PLC, auxiliary PLC, electronic protection and locking system and engine control unit are the main control units.

The most important part, the main PLC, keeps the whole system under control. Therefore, it must have certain properties. These features are;

  • It should be able to talk to more than one base station at the same time over a separate communication channel.
  • RS-232, RS-485 physical communication layer, copper cable and fiber optic physical medium should be able to communicate with multiple protocols.
  • It should be easy to expand, configure, and maintain.
  • It should be able to perform its own tests and have a structure that can warn itself and the SCADA center.
  • There must be a hardware structure in which there is no need to disconnect the power supply when replacing a faulty module.

Examples of the most commonly used SCADA software are WinCC, Citect, ICONICS, iFIX, Indusoft, Entivity Studio.

The basic logic of SCADA is to monitor, control, collect and report data and control units from a single center in all production stages. It has a wide range of applications due to the functions it provides.

SCADA usage area

  • Nuclear Facilities
  • Power Plants
  • Basin-treatment-distribution plant
  • Traffic control system
  • Automotive industry
  • Natural gas plants

Although the initial cost may seem high, the advantages listed below allow the system to pay for itself in a short time.

Advantages of SCADA

Monitor the system at any time
Save time and labor
Ability to record and analyze production data
System energy monitoring and energy saving
Preventing criminal situations (compensation, etc.)
Understand the situation and act immediately
Save interventions in the system

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