Answer / r.murugan

PID -IS THE ONE OF THE CLOSED LOOP CONTROLLER

DCS- (DISTRIBUTED CONTROL SYSTEM ) COMPLETE PLANT WILL BE
AUTOMAISED

Answer / nirav naik

I think he want to ask what is the difference between DCS &
PLC.
SO the answer is:
PLC stands for PROGRAMMABLE LOGIC CONTROLLER.
DCS stands for DISTRIBUTED CONTROL SYSTEM.

DCS = PLC+SCADA
PLC is software(ladder logic programming) and hardware
(power supply+cpu+i/o cards) which does process like
timing, counting, arithmatic, logic which is used to
activate and control the process.
SCADA= SUPERVISORY CONTROL & DATA ACQUISITION SYSTEM which
is used for making plant mimics which we are seeing on
operator DCS panel.
For more refer book S.K.SINGH

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