Answer Posted / komal

HMI & MMI both are same.
HMI is a harware device by whcih we can control the process
by changing status such as ON/OFF, cetpoint etc,
SCADA is a graphical representation of a system which
monitor,control & display data in a process,
For lage scale application we use SCADA & for small scale
application we use HMI.
HMI does not require any communication software while scada
requires it.

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