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.

New Here? Please read this important info!!!

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

Thread Tools Display Modes
Old April 22nd, 2005, 02:16 PM   #1
JWise is offline
Join Date: Mar 2005
Posts: 1
Looking for some examples of going from relays to PLCs

Yes yes another student question.

I'm doing some research and I'm looking for some detailed examples of relay logic diagrams and hardware wiring and how to convert to ladder logic and PLC wiring. I've having trouble just finding old relay logic examples on the net.

In so many book it is said how PLCs replace relay logic and ladder logic looks like relay logic. I'd like to see it to believe it.

I have found this site which is a pretty good example. But I'm having trouble with comming up with more.

Does anyone have any sites they can point me too? Or maybe some good keys words to google with?
  Reply With Quote
Old April 22nd, 2005, 02:51 PM   #2
Ken Moore
Lifetime Supporting Member
United States

Ken Moore is offline
Ken Moore's Avatar
Join Date: May 2004
Location: North, West, South Carolina
Posts: 3,349
try these:
Certified Siemens Functional Safety Professional,
ID: SFSP17010238
NRA Benefactor
  Reply With Quote
Old April 22nd, 2005, 11:23 PM   #3
United States

leitmotif is offline
Join Date: Nov 2004
Location: Seattle Wa. USA
Posts: 3,680
Find yourself an older bldg built before 85 or so and NOT upgraded.

IF you can get in look at the elevtor controls. Should be all relay.
Same for fire alarm.

Same for REAL OLD telephone switch stations.

Go to an elevator outfit and ask to look at old prints. Same for the college you go to - ask the guys in Facilities.

Automotive -- starter motor is still started with a relay, turn signals are done with a relay (flasher).
  Reply With Quote
Old April 23rd, 2005, 12:15 AM   #4
Lifetime Supporting Member
United States

Lancie1 is offline
Lancie1's Avatar
Join Date: Jul 2003
Location: Alabama
Posts: 9,999
Here is a typical schematic using relays:

Last edited by Lancie1; April 23rd, 2005 at 12:21 AM.
  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
Relays Instead of PLC in High Speed BarCode Application for Pharma??? jdcochran LIVE PLC Questions And Answers 6 September 29th, 2004 07:08 PM
future of exisiting PLCs against the Soft PLCS Sarit LIVE PLC Questions And Answers 36 September 9th, 2004 01:15 AM
Practice exercises and examples on the use of PLC's MechEng83 LIVE PLC Questions And Answers 4 June 26th, 2003 02:01 AM
PLC's Versus Relays Paul LIVE PLC Questions And Answers 2 August 2nd, 2002 06:36 PM

All times are GMT -4. The time now is 04:57 AM.