WHAT IS THE DIFFERENCE BETWEEN PLC AND DCS
Answers were Sorted based on User's Feedback
Answer / jain
PLC is controlling only one process unit with one CPU.
DCS can control many process units with many CPU.
Is This Answer Correct ? | 25 Yes | 20 No |
Answer / rizvi
Plc is a programmble logic control device which has no.of CPU
where as a Distributed Control System
Is This Answer Correct ? | 2 Yes | 0 No |
Answer / jitendra chauhan
PLC is a single digital module which is stand with on/off
digital input/output,PLC ahd seprate a single logic,used
for single particuler performing complete the task of
operation. And DCS is a combination of PLC which made a
joined a network through controlled and operation on a
single controlled room.
Is This Answer Correct ? | 2 Yes | 0 No |
Answer / pranab nath
DCS is useful only for process control loop as compare to
PLC
Where as PLC can perform high speed discrete control,
motion control and process control also.
Is This Answer Correct ? | 8 Yes | 7 No |
Answer / ravi kant anand
There is a chip inside PLC which is burnt with logics as
per requirement of process and once the chip is burnt after
that you can only modify the logic or even you can include
single I/O by reburning the chip only in shutdown of
process "not in running process",second option could be to
include separate PLC for including even single signal in
running process. but in case of dcs you can include, modify
or change the logics, even in running process by
downloading into controller.
finally we can say, it would be better
to use PLC if you are quite sure that there would not be
any inclusion, modification or change in logic for the
process otherwise DCS would be smart choice.
generally for small process we could
be sure that there would not be any inclusion, modification
or change in logic for the process so most often we use
PLC, but for large process like handeling the process of
whole power plant, logic inclusion, modification or change
is often so dcs would be better choice.
Is This Answer Correct ? | 2 Yes | 1 No |
Answer / veeru
The simple difference of the PLC is open loop system and where the DCS is Closed loop system
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / sara
Dcs is the advanced method of plc. It is the graphical representation of process.plc cannot monitor the process which is going.
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / pranav
the difference between plc and dcs is in their scan time.
scan time of plc is less than that of dcs.
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / rajaram
NOW DAYS THERE ARE NO MORE DIFFERENCE IN PLC & DCS,
BASICALLY PLC ARE USED REDUCED NO OF ELECROMAGNETIC RELAY &
dcs IS USED FOR REDUCED pid CONTROLLER.
NOWDAYS PLC ARE SUING FOR SEQUENCIAL CONRROL I.E ESD AND
OTHER SAFETY RELATED SPECIFIC SYATEM OND OTER HAD DCS IS
BEING USED FOR CONROL OVER ALL PLANT AT ONE PLACE USING V
NET(YOKOGWA SYSTEM) OR DELTA v(EMERSON).
PLC TAKES LESS TIME TO CONTROL THE PROCESS MEANS CONTROL
ACTION HOWEVER IN CASE OF DCS IT TAKES MORE TIME.
IN DCS DIFFERENT PLC CAN DO COMMUNICATE EACHOTHER AND DCS
EXECUTED CONTROL ACTION BY OPERATOR THROUGH FUCNTION BLOCK
AND IN plc IT IS FERFORMED BY LADDER.
PLC ARE NOT PROPRIETARY SYSTEM HOWEVER DCS PROPRIETARY
SYSTEM .
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / him
well plc is for one machine control and dcs for so many
machines control with one cpu.
Is This Answer Correct ? | 5 Yes | 5 No |
hey any one got the papers of SAIL and HPCL plz do help me by posting them to my mail ID's naren07_87@yaho.co.in, surenarendra@gmail.com
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