Answer Posted / abhishek

PLC is programmable logic controller. It has got wide
application like controlling a drive, motor or any other
batch process. PLC's have got capacity to handle less
number of input.
DCS is distributed control system. It has got application
where there are large number of inputs/outputs. Used for
large process handling.
SCADAA is supervisory control and data acqusition. SCADA
System usually consists of the following subsystems:
PLC, HMI,RTU.

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