You are not registered yet. Please click here to register!


 
 
plc storereviewsdownloads
This board is for PLC Related Q&A ONLY. Please DON'T use it for advertising, etc.
 
Try our online PLC Simulator- FREE.  Click here now to try it.

---------->>>>>Get FREE PLC Programming Tips

New Here? Please read this important info!!!


Go Back   PLCS.net - Interactive Q & A > PLCS.net - Interactive Q & A > LIVE PLC Questions And Answers

PLC training tools sale

Reply
 
Thread Tools Display Modes
Old May 20th, 2009, 04:11 AM   #16
Ken Moore
Member
United States

Ken Moore is offline
 
Ken Moore's Avatar
 
Join Date: May 2004
Location: Upstate South Carolina
Posts: 2,325
I have/do work with both. The biggest differences in my opinion are.
1. DCS systems do fault tolerance and redundancy much better. The PLC's are not close...yet.
2. It is much easier to do complex controls with a DCS, yes you can do the same thing with a PLC, but it takes a lot more code.
3. Only one tag database in most DCS systems. With a PLC/SCADA system, each has there own list of "tags".
4. PLC/PAC controllers are much faster, but hold less. Most DCS systems have 100msec scans or slower.
__________________
"To give real service you must add something that cannot be bought or measured with money; and that is sincerity and integrity."
- Donald A. Adams

  Reply With Quote
Old May 20th, 2009, 04:39 AM   #17
FrancisL
Member
United Kingdom

FrancisL is offline
 
Join Date: Aug 2004
Location: Portsmouth UK
Posts: 160
In short, PLC/SCADA systems may require more engineering effort, at least that is what the DCS people will tell you. Certainly this is true for continuous processes and those with relatively little discrete control. Also DCS's tend to be more easy to configure for things like redundancy.
__________________
Keeping it Simple takes thinking time.
  Reply With Quote
Old December 14th, 2014, 10:18 PM   #18
sugina07@gmail.com
Member
India

sugina07@gmail.com is offline
 
Join Date: Dec 2014
Location: mumbai
Posts: 1
PLC is a programmable Logic controller which is used mainly for interlocking different equipments.
DCS is Distributed Control Systems which is used to control very big plants by using simple GUI screens.PLCs are interfaced with DCS for interlocking.
SCADA is Supervisory Control and Data Aquisition which is used to control and Monitor small number of Equipments in a field.SCADA systems are typically used to perform data collection and control at the supervisory level. Some systems are called SCADA despite only performing data acquisition and not control.The supervisory control system is a system that is placed on top of a real-time control system to control a process that is external to the SCADA system (i.e. a computer, by itself, is not a SCADA system even though it controls its own power consumption and cooling). This implies that the system is not critical to control the process in real time, as there is a separate or integrated real-time automated control system that can respond quickly enough to compensate for process changes within the time constants of the process. The process can be industrial, infrastructure or facility based as described below:
Difference between PLC and DCS
  Reply With Quote
Reply
Jump to Live PLC Question and Answer Forum

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Topics
Thread Thread Starter Forum Replies Last Post
connection between RMS controled by PLC and DCS control room DeltaX LIVE PLC Questions And Answers 0 December 27th, 2008 06:29 AM
Total Fustration - PLC vs DCS jaichains LIVE PLC Questions And Answers 21 November 26th, 2008 11:38 AM
how to exchange the datas between PLC and DCS? jayesh.monpara LIVE PLC Questions And Answers 5 August 11th, 2008 08:33 AM
PLC Integration with DCS sandhya123 LIVE PLC Questions And Answers 1 October 30th, 2007 09:48 AM


All times are GMT -5. The time now is 12:08 AM.


.