Answer Posted / justin

PLC- programmabale logic controller - more like a micro
controller but program resides in PLC can b modified without
knowledge of C or assembly language. maily used for making
logical flow of a process..

whereas

scada- supervisory control and data acquisition system- this
is software that control two or more PLCs.. Donno in which
laguage this program is written but as far as n
instrumentation engg is concerned we need to control PLCs
from scada.

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