Supervisory Control and Data Acquisition (SCADA) — definition
Supervisory Control and Data Acquisition (SCADA) is a software system that monitors and controls distributed industrial processes by collecting data from field controllers and presenting it for centralised operator oversight.
SCADA systems typically aggregate data from multiple PLCs or remote terminal units across a site, providing alarms, trending, and centralised control screens. They are common in processes distributed over large areas, such as water treatment, utilities and multi-line manufacturing facilities.
Why it matters to industrial buyers
SCADA gives plant operators and managers a consolidated view of process status across multiple machines or areas, supporting faster fault response and centralised decision-making.
Key reference points
Typical scope
SCADA commonly spans multiple machines, lines or geographically distributed assets rather than a single machine.
Data historian
SCADA systems are commonly paired with a data historian for long-term trend storage and analysis.
Commonly confused with
MES
SCADA focuses on real-time monitoring and control of process equipment; a manufacturing execution system manages production orders, scheduling and traceability at a higher business level.
How it is used in practice
The plant's SCADA system displayed real-time status of five packaging lines and raised an alarm when a conveyor motor overloaded.
Frequently asked questions
Does SCADA replace PLCs?
No, SCADA supervises and visualises data from PLCs; it does not typically execute the fast real-time control logic itself.
Is SCADA used only in large facilities?
It is most common in larger or distributed operations, though smaller SCADA implementations exist for single-site monitoring.
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Related terms
Programmable Logic Controller (PLC)
Programmable Logic Controller (PLC) is an industrial digital computer designed to execute control logic reliably in real time for machinery and process automation in harsh factory environments.
Human-Machine Interface (HMI)
Human-Machine Interface (HMI) is the operator-facing display and control panel that allows personnel to monitor status, adjust parameters and respond to alarms on a machine or process.
Manufacturing Execution System (MES)
Manufacturing Execution System (MES) is software that manages and tracks production orders, work-in-progress, quality data and material consumption on the shop floor in real time.
Industrial Internet of Things (IIoT)
Industrial Internet of Things (IIoT) refers to networks of connected sensors, devices and machines that collect and exchange operational data to support monitoring, analytics and automation across a facility.
Industrial Automation
Industrial automation is the use of control systems, robotics and information technology to operate production equipment and processes with reduced manual intervention.
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Reference content only. Global B2B Group is independent of equipment manufacturers and financing institutions; definitions are provided for education and do not constitute engineering, financial or legal advice.