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Question
WHAT IS THE DIFFERENCE BETWEEN PLC AND DCS
 Question Submitted By :: Prakash
I also faced this Question!!     Rank Answer Posted By  
 
  Re: WHAT IS THE DIFFERENCE BETWEEN PLC AND DCS
Answer
# 1
programming logic control & digital logic control 
Is This Answer Correct ?    74 Yes 570 No
Kamal Jeet
 
  Re: WHAT IS THE DIFFERENCE BETWEEN PLC AND DCS
Answer
# 2
PLC is Progamable Logic Controller & DCS is Distributed
control system. In brief PLC using for perticular mechine or
production unit. DCS usinging for monitoring & controlling
of entire plant, including PLC.
 
Is This Answer Correct ?    517 Yes 70 No
Stanly.d'cunha
 
 
 
  Re: WHAT IS THE DIFFERENCE BETWEEN PLC AND DCS
Answer
# 3
DCS is a number of PLC's Distributed over a Control Network
over the entire plant.
 
Is This Answer Correct ?    179 Yes 137 No
Sai
 
  Re: WHAT IS THE DIFFERENCE BETWEEN PLC AND DCS
Answer
# 4
Plc is basically oriented for one job only,suppose if plc
fails then whole system will shut down,but in distributed
control system,you have a redundant plc for each plc so
that if primary system fails then its standby plc takes
over the charge.
 
Is This Answer Correct ?    239 Yes 82 No
Vipin
 
  Re: WHAT IS THE DIFFERENCE BETWEEN PLC AND DCS
Answer
# 5
PLC is used Commonly with On\Off (Digital) Control and may
be expanded with Analog I\O Modules for Analog Control and
used for a Unique Task .
DCS is used Commonly with Process Control Systems as it is
Combined of Many control Cards, PLCs and Can Mange a Large
Scale Systems .
 
Is This Answer Correct ?    197 Yes 40 No
AAM
 
  Re: WHAT IS THE DIFFERENCE BETWEEN PLC AND DCS
Answer
# 6
plc-programmable logical control,in plc program executes
searliy but in dcs all programs runs parallay.
dcs includes controller,communication and scada but plc is
a controller communication and scada softwares are to be
provided.
it ios easy to work on dcs than plc as it is having many
functions.
 
Is This Answer Correct ?    126 Yes 34 No
Dalip
 
  Re: WHAT IS THE DIFFERENCE BETWEEN PLC AND DCS
Answer
# 7
plc is a progrramable logic controllers & dcs is a
distributed control systems. plc is a on/off controller.it
controls the only machine on or off. dcs controls the many
plc at the time.
 
Is This Answer Correct ?    61 Yes 106 No
Satishpatel-bilimora
 
  Re: WHAT IS THE DIFFERENCE BETWEEN PLC AND DCS
Answer
# 8
1.PLC is for the system which need quick response.Thats why
PLC is for control of a single system with multiple control
loop,i/p and o/p
2.The response time of PLC is in millisec which is much
less than the DCS response time
 
Is This Answer Correct ?    112 Yes 34 No
Anu
 
  Re: WHAT IS THE DIFFERENCE BETWEEN PLC AND DCS
Answer
# 9
The difference between DCS and PLC is that, PLC is
primarily a small scale control system which only executes
only digital function. When we say DCS, It is a networks of
PLC's,it is a large scale control system which is
distributed all over the plant,and is located in a control
room.
 
Is This Answer Correct ?    59 Yes 61 No
Shan
 
  Re: WHAT IS THE DIFFERENCE BETWEEN PLC AND DCS
Answer
# 10
In DCS, field I/O points can be away from the control
processor,(where as program/logic resides)its a integarted
system includes other PLC's and Stand-alone controllers for
application specific mechine or process and having large
memory for trending & Historical alarms.PLC must be a fast
scan cycle application oriented, simple system without
human meachine interface(such as process mimics/graphics)
 
Is This Answer Correct ?    65 Yes 24 No
Varathan
 

 
 
 
Other Instrumentation Interview Questions
 
  Question Asked @ Answers
 
I HAVE PRESSURE TRANSMITTER WITH TWO WIRES 24 VOLTS SUPPLY.IF TRANSMITTER WILL GIVE SIGNAL TO THE DCS WHAT HAPPEN TO THE 24 VOLTS POWER SUPPLY IT WILL DROP OR REMAIN TO 24 VOLTS POWER SUPPLY.   3
What is the basic principle of vibration measurement by BENTLY NEVADA vibration measurement system? and Why it gives the -ve voltage output? GNFC 13
how control valve works? Qatar-Airlines 6
TRANSDUSER MOSTLY CONVERT WHICH ENERGY INTO ENERGY ? DVC 5
I have 475 hart communicator. this is not support any new type of instruments such as tranmitter,fieldvue DVC6200.DVC 200 since i got point out need to upgrade . my questions is how can upgrade new instruments software in my 475 hart communicator. can any answerplease>?   1
in a electronic controller why we are using 250 ohm resistance in input signal?is i/p is necessary in control valve when we are using electronic controller give details? IOCL 3
what is the main supply source for pressure transmitter?   1
what is HVAC?   1
what is differential pressure transmitter and transducer? how to work? Idea 1
how to calibrate a control valve? Reliance 6
The process variables that need to monitored and controlled are ________, ________, _________ and   1
hello this is dhinakar i am completed my instrumentation engg . recently i got job in sugar industry side. i like to ask one question can any one say what are the things i have to follow know more about industrial instrumentation,,,,,,,   6
 
For more Instrumentation Interview Questions Click Here 
 
 
 
 
 


   
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