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7 comments
Anonymous Poster

whats difference between DDC, DCS & PLC ?

12/01/2007 5:13 AM

what is the difference between DDC, DCS, PLC ? all controllers are same or any difference. if difference plz explane about all.

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Anonymous Poster
#1

Re: whats difference between DDC, DCS & PLC ?

12/02/2007 2:37 AM

plz use google

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Power-User

Join Date: Jun 2007
Location: Port Neches, Texas -- Bond Point
Posts: 117
Good Answers: 2
#2
In reply to #1

Re: whats difference between DDC, DCS & PLC ?

12/02/2007 1:53 PM

I think it is the size of the box plc small, ddc medium, dcs large.

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Anonymous Poster
#6
In reply to #2

Re: whats difference between DDC, DCS & PLC ?

05/20/2010 6:08 AM

Are u a technical person or mad ??????????

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Anonymous Poster
#7
In reply to #6

Re: whats difference between DDC, DCS & PLC ?

11/18/2010 8:33 PM

if cant understand you should shut up ur asshole too.....

Reply Off Topic (Score 5)
Anonymous Poster
#4
In reply to #1

Re: whats difference between DDC, DCS & PLC ?

12/27/2007 9:03 AM

DDC : DDC is a universal controller where both analog and digital input/outputs are combined in one controller card also it is specially designed for the HVAC ( Heat ventilation air conditioning) design which are used for air handling unit. it's cost is lower than compare to PLC and DCS, it uses profibus and modbus as a communication protocol which are very speedy responds.

PLC : plc is mainly design for small applications, cost is higher compare to DDC. it is only one conroller, communication protocols are open so it can connect with any controller, programming language is ladder logic and functional block diagram whcih work on relay logic.

DCS : distributed control system which works on multiple controller, and nos of controller are attached with system, cost is very high. communication protocols are open, mainly used in continuous plant and very highly efficiency plant.

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Commentator
Engineering Fields - Electrical Engineering - New Member India - Member - New Member

Join Date: Dec 2009
Location: Bangalore,India
Posts: 80
Good Answers: 1
#5
In reply to #4

Re: whats difference between DDC, DCS & PLC ?

12/21/2009 1:05 AM

please go to website www.plctalk.net,& www.control.com & http://cr4.globalspec.com/thread/14677/whats-difference-between-DDC-DCS-PLC & http://tunthai.multiply.com/journal/item/2387/CR4_DDC_Direct_Digital_Control_vs_Distributed_Control_SystemProgrammable_Logic_Controller_DCSPLC

http://www.allinterview.com/showanswers/69909.html( u will get very good answers)

hope these sites may help u

Shrimant Shanbhag, Bangalore, India

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Commentator

Join Date: Dec 2005
Posts: 96
Good Answers: 6
#3

Re: whats difference between DDC, DCS & PLC ?

12/05/2007 3:27 PM

1.Direct Digital Control refers to the ability to control HVAC devices via programming

2. PLC Simplified with limited logic control for like a machine or simple process with limited interlock logic


3. DCS is concerned with huge multiple logic controllers with >1000 of inter lock for process of power plant or refineries or any process Industries)

In essence they are application specific to different processes but they all operate on the same principle such as programming logic and digital

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