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.

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