What is the difference between PLC and DCS?

Discussion in 'General Electronics Chat' started by Revathy Nair, Dec 21, 2013.

  1. Revathy Nair

    Thread Starter New Member

    Sep 18, 2013
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    What is the difference between PLC and DCS?
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
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    It mainly depends on the application, PLC is fine for smaller stand alone systems up to a certain number of I/O, if you have a large degree of distributed I/O then you may want to look at some form or DCS.
    Max.
     
  3. strantor

    AAC Fanatic!

    Oct 3, 2010
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    In a petrochemical plant or refinery, there will be an operator's station with screens and buttons, monitoring tank levels, flow transmitters, pressure transmitters, and controlling pumps and valves all over the massive expanses of the plant grounds. That's a DCS. On an injection molding machine or a winder, there will be a small electronic brain that controls rotational proportions or valves sequences. That's a PLC.
     
  4. GetDeviceInfo

    Senior Member

    Jun 7, 2009
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    A PLC is a piece of hardware, while DCS is a control strategy.
     
  5. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Maybe do an in-depth investigation of each and come up with your own conclusions?
    Max.
     
  6. GopherT

    AAC Fanatic!

    Nov 23, 2012
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