Answer / deepak

These are the major differences
1. scanning time of a PLC is depend upon the length and size of the program. In DCS scanning time is constant.
2. DCS can handle large number of IOs

Answer / lalit dongre

PLC is mainly used for sequential control but dcs is a distributed control it can handle many process in one time also DCS Has redundancy feature so that the process cannot Stop due to power failure.  

Answer / sumit_110386

PLC Simplified with limited logic control for like a
machine or Simple process with limited interlock logic -
progamme can be modified easily.& also proto type.This will
give only indication of faiiure.No recording the event or
process parameter ,with limited memory.Cost wise it is very
cheap

Dcs concern Huge multiple logic controlls with >1000 of
inter lock for process of power plant or refineries or any
process Industries it will give all types of alarm in soft
copy & hard copy about process , failure & record all the
process input & out put parameters & efficiency if
required .(like Boiler,Turbine, Generator controlls Switch
gear cotrolls ie power generation to Transmission It will
cover up everything) Very huge memory back up, failuer rate
very less.process parameter all are fixed cannot be changed
by Individual. Troube shooting very easy .production will
not be affected at all .( (stand by system will take care
automatically change over)Cost will be very high.

Answer / faiyaz ahmad

PLC.stand for programmable Logical Control its industrial computer which is used monitoring and control the field instrument means more number of Input out put
DCS stand for Distributed control system means monitoring and controlling more number of input and out put its control the one unit of plant.

Answer / linu mohan

PLC-Programmable Logic Controllers

DCS-Distributed Control Systems

Different no. of PLC's contribute together to make
a DCS system

In my plant I want to mount a steam flow transmitter .Flow nozzel is already mounted in steam line .So how can i know the range to put in flow transmitter?

1 Answers  

Can Any body tell me about the Contact or Email id of any good Consultancy which help me to find a job in Instrumentation Field in India .I have Six years of Work Experience in the Same field.Please revert me back on shammi_gwalior@yahoo.com ?

0 Answers  

What is zener diode? What is voltage regulator?

0 Answers  

What is rang ability?

0 Answers  

In dcs contol valve parameters showing like this Gain=1 or 2 , ti=7 sec, td=20sec. But temp,pressure,level control valves we are using in which type parameter side using ti,td clearly tell me

1 Answers  

if field commnictor 475 does not communicate with transmitter what will you do ?

4 Answers   Samsung,

What will the new flow factor if D/P Transmitter is RE-RANGED from 25" WC to 50" WC

3 Answers   ADMA OPCO,

why t/c is connected parallel and what is the purpose of it

2 Answers  

How can corrosion alter the accuracy and precision of a C- Bourdon tube pressure gauge?

1 Answers  

Which instrument used to calibrate the pressure switch?

8 Answers  

in which principle pressure tx,level tx ,flow tx,temp tx ,control valve works?

0 Answers   IOCL, JSW,

what is the difference between active & reactive power?

0 Answers