I need help with simple ladder logic. - PLCS.net

dennisc · December 11th, 2007, 08:50 AM

This is an assignment for class. I'm about to pull my hair out on this one. All the others have been very easy using timers and counters, but I'm not having much luck with using only comparison statements. I can use one master timer and comparison statements on this assignment. I think I got the program pretty well figured out, other than I keep getting double red lights at the beginning of the program (TON 0-50). According to the instructions, both red lights must come on for a period of 5 seconds at the intial start up of the program. It would be a lot of easier if I could use a start up timer, but I can't. I've tried to use the jmp. and lbl. but can't becuse the timers are in parallel. I'm trying to figure out how to advance the TON4:0 ahead by using the "MOV" command. Is it possibe to advance the timer by 50 to avoid the double red lights at the beginning of the program?
I'm trying to download a picture with the instructions to give a clearer view but my file size is 704 kb. I would greatly appreciate any advice or ideas.
Thanks Dennis

averytc · December 11th, 2007, 02:39 PM

I can't understand what your trying to do. Can you be more clear and post what you have so far so that we can try to help you?

Charlie

magicsmoke · December 11th, 2007, 02:42 PM

This look's like the same post as this one same person http://www.plctalk.com/qanda/showthread.php?t=35483

averytc · December 11th, 2007, 02:44 PM

Yep... I just saw that, and it looks like he's being taken care of.

December 11th, 2007, 08:50 AM	#1
dennisc Member Join Date: Dec 2007 Location: home Posts: 19	I need help with simple ladder logic. This is an assignment for class. I'm about to pull my hair out on this one. All the others have been very easy using timers and counters, but I'm not having much luck with using only comparison statements. I can use one master timer and comparison statements on this assignment. I think I got the program pretty well figured out, other than I keep getting double red lights at the beginning of the program (TON 0-50). According to the instructions, both red lights must come on for a period of 5 seconds at the intial start up of the program. It would be a lot of easier if I could use a start up timer, but I can't. I've tried to use the jmp. and lbl. but can't becuse the timers are in parallel. I'm trying to figure out how to advance the TON4:0 ahead by using the "MOV" command. Is it possibe to advance the timer by 50 to avoid the double red lights at the beginning of the program? I'm trying to download a picture with the instructions to give a clearer view but my file size is 704 kb. I would greatly appreciate any advice or ideas. Thanks Dennis

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Topics
Thread	Thread Starter	Forum	Replies	Last Post
Viewing STEP5 in Ladder logic: Software	edward4444	LIVE PLC Questions And Answers	6	May 19th, 2006 06:57 AM
Need help with ladder logic problem	RickGilbert	LIVE PLC Questions And Answers	10	June 5th, 2005 02:38 PM
Simple ladder logic question	RickGilbert	LIVE PLC Questions And Answers	12	June 4th, 2005 04:24 AM
ONLINE Changing ladder logic for a redundant PLC5	ckchew666	LIVE PLC Questions And Answers	3	June 26th, 2004 10:09 AM
Ladder Logic Editor	Shafiq	LIVE PLC Questions And Answers	4	May 19th, 2003 12:44 PM



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.*

December 11th, 2007, 02:39 PM	#2
averytc Member Join Date: Jul 2002 Posts: 114	I can't understand what your trying to do. Can you be more clear and post what you have so far so that we can try to help you? Charlie

December 11th, 2007, 02:42 PM	#3
magicsmoke Member Join Date: Aug 2007 Location: Minnesota Posts: 110	This look's like the same post as this one same person http://www.plctalk.com/qanda/showthread.php?t=35483

December 11th, 2007, 02:44 PM	#4
averytc Member Join Date: Jul 2002 Posts: 114	Yep... I just saw that, and it looks like he's being taken care of.

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