Looking for some examples of going from relays to PLCs - PLCS.net

JWise · April 22nd, 2005, 02:16 PM

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?

Ken Moore · April 22nd, 2005, 02:51 PM

try these: http://www.ibiblio.org/obp/electricC...al/DIGI_6.html
http://www.patchn.com/
http://www.thelearningpit.com/

leitmotif · April 22nd, 2005, 11:23 PM

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).

Lancie1 · April 23rd, 2005, 12:15 AM

JWise,
Here is a typical schematic using relays:

April 22nd, 2005, 02:16 PM	#1
JWise Member 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?

April 22nd, 2005, 02:51 PM	#2
Ken Moore Lifetime Supporting Member Join Date: May 2004 Location: North, West, South Carolina Posts: 3,349	try these: http://www.ibiblio.org/obp/electricC...al/DIGI_6.html http://www.patchn.com/ http://www.thelearningpit.com/ __________________ Certified Siemens Functional Safety Professional, ID: SFSP17010238 NRA Benefactor

April 23rd, 2005, 12:15 AM	#4
Lancie1 Lifetime Supporting Member Join Date: Jul 2003 Location: Alabama Posts: 9,999	JWise, Here is a typical schematic using relays: Last edited by Lancie1; April 23rd, 2005 at 12:21 AM.

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April 22nd, 2005, 11:23 PM	#3
leitmotif Member 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).

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