What is SCADA System? | SCADA Server and Station Explained in Industrial Automation

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What is the SCADA System?

A SCADA system (Supervisory Control and Data Acquisition) consists of multiple components that work together to monitor and control industrial processes. Two of the most important parts of the SCADA system are the SCADA Server and SCADA Station.

SCADA Server

The SCADA Server is the central system in the automation network. This server is directly connected with PLC and DCS systems and continuously reads and writes data using communication protocols, commonly RS485 or Ethernet communication. It is the main data hub of the entire industrial automation system.

Functions of SCADA Server

  • Collects real-time data from PLC and DCS (PLC & DCS collect data from field devices)
  • Stores real-time data as per pre-configured time intervals (This data is stored in a non-editable format)
  • Stores and manages all pre-configured alarms and user logs
  • Distributes and collects data from the Operator Station (audit log, user log, operator station alarm)

The SCADA Server is usually installed on a powerful industrial computer to handle large amounts of process and real-time data efficiently.

SCADA Station (Operator Station / Client Station)

A SCADA Station (also called Operator Station or Client Station) is the user interface where operators monitor and control the process. It connects to the SCADA Server over a secure industrial network.

Functions of a SCADA Station

  • Displays real-time graphical screens and process trends
  • Allows operators to start, stop, or adjust processes
  • Acknowledges alarms and warnings for quick response
  • Generates reports and data analysis for performance tracking
SCADA Stations are typically installed in control rooms or remote monitoring centers, giving operators full visibility and control of the plant operations.

Summary

The SCADA Server manages and distributes process data, while the SCADA Station is used by operators to view, analyze, and control the industrial process. Together, they form the core of a SCADA system, ensuring efficient, safe, and continuous plant operation in modern industrial automation environments. 


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