Answer / vaibhav

DCS is used for continious process while PLC is used for
sequential control system

Answer / www.islamqa.com

# PLC is first invented and developed to be used with
discrete - on/off control & with small scale applications.

# DCS is designed and fabricated to handle modulating/PID
control applications & to serve in large scale I/Os
applications.

# with great progress and achievements in plc h/w and
networking technologies we have PID algorithms with PLC and
also plc become able to handle wide range of I/O'S like
DCS, actually with good engineering the one can build his
own DCS with multible PLCs.

# But actually with great engineering to build the DCS from
multible PLCs it will not be the same as pre-built/ready to
use DCS system in its functionality and its features.

# DCS is pre-fabricated system with compatible, integrated,
and tested H/W & S/W - has the following features:

- data collection & management.
- event and history management.
- instrument management.
- alarms management.
- smart and self diagnostics.
- advanced control strategy and easy to build, configure
control loops.
- redundancy.


Regards,

Ahmed Sabry
Control and Instrumentation Engineer
GPC - General Petroleum Company
ahmedsabry.online@gmail.com
CELL.: 00 2 0121367310

Answer / satish

DCS is the advanced version of PLC.

Scan time for DCS is less than that of PLC

DCS can handle more I/O,s than PLC.

Answer / dibyendu

the scan time for plc is much lesser than dcs and plc can
hanhle digital signal more efficiently,dcs can handle analog
signal more efficiently.

Answer / joe mccabe

A lot of IO..specifically for a larger operation where there
are is lot of PID control, taking in analog inputs and
controlling outputs.

Answer / hari

DCS can handle 32 loops can be handle in single shot.
but plc can perform less than DCS..

DCS had faster scaning time.
plc can handle 6 loop in single shot

DCS can be programmed like FBD

Answer / anil

In DCS Scan time of each channel can be set but in PLC the
scan time is fix

Answer / pankaj

Dcs Is The Central Database System & It Can be Contols No OD
Devices.

Answer / alok

where lot of no. io's are used there we used dcs this basic
difference b/w dcs and plc.

please tell me how maintainence person shifted to good epc company/design company

0 Answers  

What is difference between ESD and PLC please Explain me clearly.

0 Answers  

diff bw range and span?

3 Answers  

what is different between 2,3&4 wire rtd and how much maximum distance using plc to field.

0 Answers  

Sir,I am going to sit for IOCL written test exam. recently.Can anyone tell me the name of 'Objective type Question Book on Instrumentation Engineering ' which will help me. Pl. mail to bidyut_71@rediffmail.com / bidyut.saha2008@indiatimes.com / bidyut.saha09@yahoo.in

0 Answers  

What is the difference between dry contact and wet contact?

2 Answers  

What is the purpose of MATLAB?

3 Answers  

WHAT IS THE DIFFERENCE BETWEEN PLC AND DCS

55 Answers   ABB, Adani, Adani Power, GMR, IIUC,

When doing a liquid seal on a differential flow transmitter , most of the time the sealing liquid will be heavier then the process fluid. For wich application will the sealing liquid be lighter than the process fluid if transmitter is mounted below the process line.

0 Answers   Chevron,

why we are using analytical instrument in plant ?

1 Answers  

Turbidity analyzer working principle ?

0 Answers   Tata Steel Limited,

what is the procedure of O2 analyser calibration?

3 Answers   Thermax,