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Compare an internal tag with a fixed number

Created by: Jean-Francois at: 3/11/2011 7:37 PM (3 Replies)

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3/11/2011 7:37 PM	Rate (0)
Jean-Francois Regular Member Joined: 8/23/2010 Last visit: 1/20/2012 Posts: 36 Rating: (0)	Hello With the ladder edditing, I'm looking to find the way to set an internal tag and then use it to be compared to a fixed value to triguer a specific output according to the value in that tag... (Some kind of very basique multiplexing to save timers) I have a cyclic sequence that should incrementan internal tag from 0 to 1 and then 2 at each cycle and reset to 0 after the third cycle to start again. Then look at the number to choose which output should be trigered Q1 when = 0 Q2 when = 1 Q3 when = 2 I did an "alalog math" to increment by 1 at each cycle but when i try to use an "analog comparator", i couldn't find the way to enter anything else than an physical analog input ? Do i missed something or i started it wrong? Or am i trying to do something reserved to plc programming ?
	Last edited by: Jean-Francois at: 3/11/2011 7:38 PM
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This contribution was helpful to 1 thankful Users Toeternietoe

3/11/2011 8:21 PM	Rate (0)
Andres [Str] Bronze Member Joined: 3/4/2009 Last visit: 12/3/2017 Posts: 153 Rating: (15)	Hi Jean-Francois What do you think of the shift register?
	Sorry for my English / Thanks
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3/14/2011 10:16 AM	Rate (0)
LOGO!Barbarian Posts: 173 Rating: (90)	Hey Jean-Francois! Try using 3 Up-Down counters, with the first one set to - 0 = on, 1 = off the second set to 1 = on, 2 = off and the third set to 2 = on, 3 = off and then use this output to reset the others. Sorry, no time to make an example, but I have seen somethign like this working well and it is really simple to setup and understand. Cheers
LOGO!Barbarian Posts: 173 Rating: (90)
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3/14/2011 10:32 AM	Rate (0)
Marcjan Platinum Member Joined: 4/22/2010 Last visit: 8/22/2019 Posts: 5564 Rating: (659)	Have a look at the Examples at the Logo site https://www.automation.siemens.com/mcms/programmable-logic-controller/en/logic-module-logo/application-examples/Pages/Default.aspx Succes. Attachment shift.JPG (47 Downloads)
	Last edited by: Marcjan at: 3/14/2011 4:09 PM added example with shift register Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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