Answer Posted / ibrahim s

PLC(Programable Logic Controller):
It is used to emulates relay logic interlock and provide
device status.
It works by looking at its input and depending upon
their state turning on or off its outputs.
It control the devices according to user defined logical
program.

DCS(distributed control system):
Group of PLC connected in a single loop, additionaly it
cabable to handle more input and output.
A server and/or applications processor may be included
in the system for extra computational, data collection, and
reporting capability.

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