SCADA

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A Supervisory Control and Data Acquisition (SCADA) system is an enterprise-level software whose main task is to monitor and control an electrical grid system based on the information it collects from the substations within that system.

SCADA systems are mainly used for the implementation of monitoring and control system of an equipment or a plant in several industries like power plants, oil and gas refining, water and waste control, telecommunications.

Components of Typical SCADA System

The major components in SCADA system are

Remote Terminal Units (RTUs)

 RTU is the main component in SCADA system that has a direct connection with various sensors, meters and actuators associated with a control environment.

 These RTUs are nothing but real-time programmable logic controllers (PLCs) which are responsible for properly converting remote station information to digital form for modem to transmit the data and also converts the received signals from master unit in order to control the process equipment through actuators and switchboxes.


Master Terminal Units (MTUs)

           

A central host servers or server is called Master Terminal Unit, sometimes it is also called as SCADA center. It communicates with several RTUs by performing reading and writing operations during scheduled scanning. In addition, it performs control, alarming, networking with other nodes, etc.

COMMUNICATIONS SYSTEM

The communication network transfers data among central host computer servers and the field data interface devices & control units. The medium of transfer can be cable, radio, telephone, satellite, etc. or any combination of these.

OPERATOR WORKSTATIONS

These are the computer terminals consisting of standard HMI (Human Machine Interface) software and are networked with a central host computer. These workstations are operator terminals that request and send the information to host client computer in order to monitor and control the remote field parameters.

Blog Posted By

Sri J.Jagan Rupchand. M.E.,   Lecturer / EEE

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