Answer Posted / c subramaniam

HMI IS Human to (Hand to) Machine Interface ie a Display
Screen Like a computer monitor wHICH HAS THE CONNECTIVITY
TO MACHINE CONTROLS THRU SPECIFIC SOFTWARE, It may have 3D
switches parameter setting alarm indication etc etc

where as SCADA (Supervisory Control And Data Aqusition)is a
system combined a software May be a PC with monitor or HMI
by which one can monitor the process and control it This
has got lot of options in monitoring , recording of process
data. So HMI is a part of SCADA System.

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