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Memory bits

Created by: krneki10 at: 8/17/2012 1:12 PM (7 Replies)

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8/17/2012 1:12 PM	Rate (0)
krneki10 Posts: 45 Rating: (0)	As you can see from the attachment, I would like to set M0.4 in first network to 1 with coil in second network. However, I cannot in any way affect M0.4 in first network. Goal is to restart program after M0.5 gets set to 1, and M0.4 in first network is the one who does that. Do you perhaps have any ideas for workaround? Thanks. Attachment memorybit.JPG (165 Downloads)
krneki10 Posts: 45 Rating: (0)
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8/17/2012 3:55 PM	Rate (0)
Aret Posts: 2348 Rating: (265)	Please upload whole block here. Actually M0.4 is set in your program in 3 seconds after M0.5 is set. What behavior you see? What happens if you restart PLC and then set M0.5?
Aret Posts: 2348 Rating: (265)
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8/17/2012 5:07 PM	Rate (0)
krneki10 Posts: 45 Rating: (0)	Please find whole program in attachement. As you can see, I already made some modifications so it works now (please ignore counter at this point). But maybe you have some better ideas. Aside from memory bits, the only leftover is implementation of counter. It's still work in progress, but your help would be much appreciated in any case. Here is what it should do: process should be automatically repeated 12 times. After that, everything should stop and Q0.5 should turn on. Process could be started again by enabling M0.4 which would also reset counter to it's initial value. Attachment OB1.pdf (200 Downloads)
krneki10 Posts: 45 Rating: (0)
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8/20/2012 9:15 AM	Rate (0)
nbk Posts: 197 Rating: (3)	@ krneki10 : “….process should be automatically repeated 12 times. After that, everything should stop and Q0.5 should turn on” QO.5 is not visible anywhere in your attachments (although you have defined its symbol). The process has to be repeated 12 times, but the counter is loaded with 2.
nbk Posts: 197 Rating: (3)
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8/20/2012 9:57 AM	Rate (0)
krneki10 Posts: 45 Rating: (0)	As as I said, it's still work in progress, counter is obviously not implemented well yet. "2" on counter is just for testing and that's not an issue. I just need program that will repeat whole process (Network 6 does that) automatically until counter gets to 0 (or gets to 12 depending on counter type). At this point, process should stop and only button M0.4 could start it again. My idea unfortunately doesn't work, I hope you have some. edit: I will also upload slightly updated idea later on.
krneki10 Posts: 45 Rating: (0)	Last edited by: krneki10 at: 8/20/2012 10:28 AM
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8/20/2012 10:28 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 9/14/2025 Posts: 3049 Rating: (1062)	Hello krneki10 I fear your "programming on the run" style does not help you tocome up with a useful and/or robust program result (as well as making it harder for anyone here to advice you properly). As such, allow me to suggest you go back to the drawing board and spend some time describing the overall functionality that you want to achieve. This"User requirement specification" couldbe a simple verbal description, but you'll find that adding a graphical description (e.g. a Sequential Function chart,State Machine, truth tables etc.) typically aids in making it clearer and/or less ambiguous. Once done, it isa"simple" matter of translating it into an S7 program. Should you still have problems with the code implementation and quite rightly revert back here for help, this document willalso help us to help you.
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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8/20/2012 11:58 AM	Rate (0)
krneki10 Posts: 45 Rating: (0)	Hello, I actually managed to do it, it works now, with just one small issue. I think I know where the problem is, but I'm unaware of the solution. When S_CD gets from 2 to 0, it will turn on Q0.5 and prevent program from running again. I did that by inserting normaly closed contact Q0.5 into Network 6 just before start button M0.4. Issue is that M0.4 is the one who also presets S_CD so it will take two pushes on start button M0.4 to run program again. First cycle to put normaly closed contact Q0.5 back to 0 and second time to put M0.4 to 1. So, are there any chances to shrink down that process to only one push on start button M0.4?Thanks! Attachment network11.JPG (172 Downloads)
krneki10 Posts: 45 Rating: (0)
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8/22/2012 1:32 PM	Rate (0)
krneki10 Posts: 45 Rating: (0)	bump
krneki10 Posts: 45 Rating: (0)
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