COMPARISONS · AMADEUS LAB
PLC vs SCADA
A PLC controls equipment and process logic; SCADA supervises, visualises and records selected data from PLCs and other field devices. They usually work together rather than replace one another.
AT A GLANCE
How the options differ
| Criterion | PLC | SCADA |
|---|---|---|
| Role | Executes control logic | Supervises and visualises operations |
| Typical location | Machine or control cabinet | Operator station, server or web client |
| Primary output | Physical outputs and sequences | Screens, alarms, history and reports |
| Best starting question | What must the machine do? | What must operators see, acknowledge or analyse? |
The comparison is a starting point, not a universal rule. Existing equipment, required reliability, security boundaries and the decisions users need to make should be confirmed during discovery.
COMMON QUESTIONS
Frequently asked questions
What is the difference between PLC vs SCADA?
A PLC controls equipment and process logic; SCADA supervises, visualises and records selected data from PLCs and other field devices. They usually work together rather than replace one another.
Which option should a project use?
Choose based on the required control behaviour, data context, security model, environment, lifecycle and existing equipment rather than the label alone.
Can these technologies be used together?
Often yes. Gateways and integration services can combine technologies when the architecture clearly separates control, data collection and business workflows.
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