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 - Interactive Q & A > - Interactive Q & A > LIVE PLC Questions And Answers

PLC training tools sale

Thread Tools Display Modes
Old April 28th, 2018, 10:32 AM   #1
United States

CJO is offline
Join Date: Apr 2018
Location: NY
Posts: 3
Industry Specific?

Hello everyone,

I would like to hear any opinions regarding how the type of industry relates to the complexity of the overall systems being used. I personally have only worked in a handful of manufacturing plants but have seen a notable difference from one industry to another and am uncertain if this is usually the case. So as an example, is the overall system used in a chemical plant generally more intricate than say an automotive plant or vice versa? Also do the PLC programs used in these industries carry a similar reputation for being more or less complex?
  Reply With Quote
Old April 28th, 2018, 10:44 AM   #2
United Kingdom

cardosocea is offline
Join Date: Nov 2016
Location: Fields of corn
Posts: 1,250
There's an awful lot of variables there even within the same industry. My company is a huge chemical manufacturer, our PLC systems go from complex DCS packages to PLC's programmed as you normally would to control similar processes.

This depends on the age as the newer generation makes use of the available technology.

There's also the risks involved... within the same industry, the same machine can have a simple control system or a top of the line redundant system that is engineered to never fail. The choice of which depends on additional systems linked to this one and also the industry rating for the facility.
  Reply With Quote
Old April 28th, 2018, 12:24 PM   #3
United States

jraef is offline
jraef's Avatar
Join Date: May 2006
Location: Northern California
Posts: 1,659
A long long time ago, a professor I had in a class about industrial control systems, when describing the difference between a PLC and a DCS put it this way: “A PLC makes ‘things’, a DCS makes ‘stuff’.” For a long time I found that to be generally true. DCS were used in chemical plants, oil and gas processing /refining, pulp and paper mills, brewing etc., where analog measurement and coordinated processing of hundreds or even thousands of PID loops was the paramount activity of the controller. PLCs on the other hand were used in automotive, mining, oil and gas extraction, food processing, machine tools, lumber mills etc. where there was a lot of discrete I/O for positioning sensors, interlocking, user inputs, annunciation, etc. and only a small amount of associated analog I/O and PID loop processing.

Over time the lines have definitely blurred considerably so now you find both types of systems used, sometimes in the same facility and in fact some DCS systems like A-B and Siemens are now comprised of PLCs that are linked together as the I/O sub-processors, and some of the traditional DCS systems moving into doing more PLC-like functions. But industry wise, the lines remain generally the same because of the nature of the tasks; processing of thousands of analog I/O and PID loops requires a lot more number crunching horsepower than traditional PLCs will be capable of, high speed reaction times of machine control to I/O changes and motion control remain the turf of PLCs and PACs (Programmable Automation Controllers, the newer term for higher capability systems).
  Reply With Quote
Jump to Live PLC Question and Answer Forum


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
Industry 4.0 and the programmer of today... Combo LIVE PLC Questions And Answers 35 November 2nd, 2017 04:25 PM
how to assign the specific run application in panel view plus 100 abbccc1005 LIVE PLC Questions And Answers 7 June 18th, 2013 04:00 PM
Blow Molding Industry Greg Dake LIVE PLC Questions And Answers 6 March 11th, 2011 08:24 PM
CPU 315-2PN/DP LED blinking with specific GSD file santosh8665 LIVE PLC Questions And Answers 0 January 29th, 2009 03:29 AM
Would like some information as to the practices in automation/ control sys. industry blackslipper LIVE PLC Questions And Answers 2 November 21st, 2005 07:54 AM

All times are GMT -5. The time now is 05:31 PM.