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The term SCADA consists of the first letters of the English words "Supervisory Control and Data Acquisition". Its Turkish language is Central Control and Data Collection System. SCADA systems is a general name given to systems that control and monitor units located in a wide area through the central computer and store historical data of the units.
The relay is an electromagnetic circuit element that works when current flows through it. Relays are used to switch a high power receiver with a small current. Relays can have multiple switch contacts in a single element and thus can switch multiple loads on and off simultaneously. With these features, relays are more advantageous than thyristors and triacs.
