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NEMA (National Electrical Manufacturers Association) defines PLC’s as “Programmable logic Controller is a digital electronic device which uses a programmable memory to store instructions and data and implements specific functions such as timing, counting, logic, etc to control various machines or process”. A PLC is a device that was invented to replace the necessary sequential relay circuits for machine control. The PLC works by looking at its input and depending upon their state, turning ON / OFF its inputs.
SCADA
Supervisory control and data acquisition is a control system architecture comprising computers, networked data communications and graphical user interfaces (GUI) for high-level process supervisory management, while also comprising other peripheral devices like programmable logic controllers (PLC) and discrete proportional-integral-derivative (PID) controllers to interface with process plant or machinery.
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