What does PLC SCADA mean?

PLC stands for Programmable Logic Controllers
SCADA stands for Supervisory Control And Data Acquisition

As the name indicates, it is not a full control system, but rather focuses on the supervisory level. As such, it is a purely software package that is positioned on top of hardware to which it is interfaced, in general via Programmable Logic Controllers (PLC’s), or other commercial hardware modules.

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