SCADA & HMI
SCADA
Supervisory Control and Data Acquisition
Definition
The layer that collects data from controllers across a plant or service area, presents it to operators, records it, raises alarms, and allows intervention.
SCADA supervises; the PLCs and RTUs perform the real-time control. In a correctly designed system, losing SCADA costs visibility, alarming, and history, but the process keeps running.
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