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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 ?    69 Yes 548 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 ?    498 Yes 67 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 ?    167 Yes 135 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 ?    230 Yes 79 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 ?    192 Yes 38 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 ?    125 Yes 33 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 ?    60 Yes 104 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 ?    106 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 ?    55 Yes 60 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 ?    63 Yes 24 No
Varathan
 

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