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   PLCS.net - Interactive Q & A > PLCS.net - Interactive Q & A > LIVE PLC Questions And Answers

Reply
 
Thread Tools Display Modes
Old December 3rd, 2014, 03:08 AM   #1
hisaurabh
Member
India

hisaurabh is offline
 
Join Date: Dec 2012
Location: Mumbai
Posts: 12
Exclamation Help in developing this ladder logic!

Hi,
Help me building this logic in AB’s ladder logic format. I have ControlLogix PLC.
In field, I have three pumps connected in series. Say Pump-A, Pump-B, and Pump-C.
Every time “START” bit goes TRUE, two of the pumps should start but not the third one.
In below combination:
START = Start (Pump-A and Pump-B)
START = Start (Pump-B and Pump-C)
START = Start (Pump-C and Pump-A)
And then again… same cycle repeats.
Please note that I have only one “START” bit … I mean, had there been three different “START” signals I could have placed them to start in above combination. Every such START command will stay TRUE for 4 hours and then will remain FALSE for one hour. Then again START command for 4 hours…and so on. BUT EVERYTIME THIS START COMMAND COMES; PUMPS SHOULD START IN ABOVE COMBINATION ONLY.
This logic is because I do not want same pair of pumps to run all the time and get heated.
Please help in developing this ladder logic.
Thanks in advance,
Saurabh
  Reply With Quote
Old December 3rd, 2014, 06:53 AM   #2
dginbuffalo
Member
United States

dginbuffalo is offline
 
Join Date: Dec 2010
Location: Buffalo,NY
Posts: 630
Here's one way to accomplish.
Attached Images
File Type: jpg SEQ START.jpg (23.7 KB, 114 views)
  Reply With Quote
Old December 3rd, 2014, 03:42 PM   #3
GTUnit
Member
United States

GTUnit is offline
 
Join Date: Oct 2009
Location: Orange, CA
Posts: 397
What you are looking for is "Pump Sequencer Logic"
Googling the above search term will give you some good info.
Here is another thread with the same and a sample program:

http://www.plctalk.net/qanda/showthread.php?t=41143

You should also have switchover to a good pump if a running pump fails.
  Reply With Quote
Old December 4th, 2014, 10:53 PM   #4
hisaurabh
Member
India

hisaurabh is offline
 
Join Date: Dec 2012
Location: Mumbai
Posts: 12
Quote:
Originally Posted by dginbuffalo View Post
Here's one way to accomplish.
Thanks a lot man! I got that.
  Reply With Quote
Old December 4th, 2014, 10:54 PM   #5
hisaurabh
Member
India

hisaurabh is offline
 
Join Date: Dec 2012
Location: Mumbai
Posts: 12
Quote:
Originally Posted by GTUnit View Post
What you are looking for is "Pump Sequencer Logic"
Googling the above search term will give you some good info.
Here is another thread with the same and a sample program:

http://www.plctalk.net/qanda/showthread.php?t=41143

You should also have switchover to a good pump if a running pump fails.
Thanks! I did do a search for that.. there are many such interesting logics available! A lot to learn from...
  Reply With Quote
Reply
Jump to Live PLC Question and Answer Forum

Bookmarks


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
Assigning INT values with ladder logic David.Reed.Schmidt LIVE PLC Questions And Answers 10 May 25th, 2016 09:35 AM
Flow Ladder Logic slenkovj LIVE PLC Questions And Answers 14 May 14th, 2013 02:05 PM
help for analog input ladder logic bayeibrahima LIVE PLC Questions And Answers 5 March 15th, 2011 10:34 AM
Sequencer logic. Ladder or SFC? AJZ LIVE PLC Questions And Answers 6 February 21st, 2011 12:56 PM
Need help with ladder logic problem RickGilbert LIVE PLC Questions And Answers 10 June 5th, 2005 02:38 PM


All times are GMT -4. The time now is 09:27 PM.


.