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  I don't get ladder logic.
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   Author  Topic: I don't get ladder logic.  (Read 52854 times)
Yoseph
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I don't get ladder logic.
« on: December 31, 2002, 10:55:32 PM »
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     I have done some machine language programming and some of the other higher
level programming. I think I have a good understanding of how computers work. Does a
ladder logic symbol relate to a specific routine in the PLC?
     I have a PLC I am trying to learn to programm and ladder logic is not making a lot
of sense. I hope some one here can point me in a direction of a good tutorial, a book
or a web site.
                                                                     thanks
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Re: I don't get ladder logic.
« Reply #1 on: January 01, 2003, 11:25:45 AM »
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If you need very fundamental knowledge about ladder logic, please visit:

http://www.plcs.net

I hope it helps.
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philipjoseph
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Re: I don't get ladder logic.
« Reply #2 on: January 07, 2003, 01:08:06 PM »
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HEY YOSEPH, CHECK THIS: http://claymore.engineer.gvsu.edu/~jackh/books/plcs/html/plcs.html

THERE IS A COMPLETE AN USEFUL MANUAL.

PHILIP
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Yoseph
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Re: I don't get ladder logic.
« Reply #3 on: January 07, 2003, 05:45:49 PM »
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Hi:-
     That is exactly what I need. Thanks a million Philip.

                                                      Yoseph
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MAD
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Re: I don't get ladder logic.
« Reply #4 on: February 06, 2003, 04:27:55 AM »
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Try this link also.  Lots of example programs, Downloads, and  lots of other links!!!

http://www.geocities.com/plc_guide/index.html

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Adam
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Re:I don't get ladder logic.
« Reply #5 on: November 22, 2005, 05:26:19 PM »
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What would the ladder logic look like to create the movement of an X-Y table (with the use of two stepper motors) to create a parabolic function and a circle?
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Myers
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Re:I don't get ladder logic.
« Reply #6 on: November 23, 2005, 09:47:28 AM »
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I tend to think of my PLC's differently.  There is no real way to do what you want with ladder logic.  It's easier to accomplish with a function as an output in ladder logic.

Ladder logic deals primarily with solid state.  A device is either ON or OFF.  A switch is either OPEN or CLOSED.  Each device, say for example a light bulb, has a number of things that have to happen to turn on.  Switch 1 may need to be open, Switch 2 may need to be closed and either Switch 3 or Switch 4 must be closed.  It relatively easy in ladder logic to perform this.

Wher Tri-Logic comes in is that instead of turning on a light with all those switches, you can turn on a BASIC program that will run and perform your functions.

In your case, a function output would be controlled by inputs called "E-Stop Pressed" AND "Light Curtain Clear" AND "Start Button Pressed".  When all three of those events happened at the same time, a function (Output) would be run to pulse your steppers incrementing or decrementing your X and Y values to make your pattern.

The challenge is not really in the Ladder Logic, but in the BASIC function!

Mark Myers
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Re:I don't get ladder logic.
« Reply #7 on: June 23, 2006, 02:23:45 PM »
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Chapter 8 in the TRiLOGI Programmer's Reference Guide has a short introductory course on Ladder Logic Programming. For those interested, please download the Chapter below:

  www.tri-plc.com/appnotes/Chapter8.pdf



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Re:I don't get ladder logic.
« Reply #8 on: August 08, 2010, 03:33:44 PM »
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You can now go to the following web page to download a free PLC programming E-book written by Kevin Collins of Ireland Sligo Institute:

http://www.tri-plc.com/reqplcbook.htm

This book presents a number of ladder programs that are constructed using the TRiLOGI software and you can use our PLC simulator to test the program.
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