5/19/2012 8:55 AM  
Joined: 4/23/2012 Last visit: 7/22/2012 Posts: 36 Rating: (1) 
Hiii All,,, How to make exponential graph against time in X axis on S7 300? so the plot will raise exponentially while time(second) is thicking. because it will be also plotted into Trends of Scada thank you in advence Firzzz 
5/19/2012 3:00 PM  
Joined: 4/15/2009 Last visit: 4/25/2016 Posts: 691 Rating: (35) 
Have you tried EXP Function under Floating Point Fct. in STL/LAD Editor? 
Niranjan 

5/19/2012 3:39 PM  
Joined: 1/3/2006 Last visit: 11/6/2019 Posts: 725 Rating: (63) 
Hi You will hit over flow at 88.8 Soincrement slowly. See help file of step 7 for more on EXP 
5/20/2012 6:04 PM  
Joined: 4/23/2012 Last visit: 7/22/2012 Posts: 36 Rating: (1) 
Hii Niranjan, yes i have tried EXP. but how to make the time is thicking in X axis? to integrate to the trend. i am using Indusoft for Scada. Thanks Firza 
5/20/2012 6:27 PM  
Joined: 1/3/2006 Last visit: 11/6/2019 Posts: 725 Rating: (63) 
Y=EXP(X) X=1, 1.1,2,3,4......whatever Y iscalculated value for corresponding X values. So that's it. 
5/21/2012 5:01 AM  
Joined: 4/23/2012 Last visit: 7/22/2012 Posts: 36 Rating: (1) 
hi manmeet, how can i see the graph? and how to make it Input++? thanks firza 
5/21/2012 5:23 AM  
Joined: 4/23/2012 Last visit: 7/22/2012 Posts: 36 Rating: (1) 
Hii, how to make 1e^t/25 ?? (charging graph) t is time. thanks firza 
5/21/2012 6:39 AM  
Joined: 4/23/2012 Last visit: 7/22/2012 Posts: 36 Rating: (1) 
well,, I am using this block formula to make 1e^(t/25). am i right? but how to integrate t with the time for 60 second? thanks 
5/21/2012 7:41 AM  
Joined: 8/27/2006 Last visit: 12/12/2019 Posts: 702 Rating: (85) 
I think you still want to simulate that temperature sensor thing eh? You can program OB35 for a scan cycle of 1 second (1000 mSec). You should then zero your formula at the start of (say a button on the scada named RESET) (i.e. set t=0 or whatever t value to reset your formula). Then you can increment t every OB35 cycle by (e.g. 0.01)

The more you know, The more you know that you don't know 

5/22/2012 7:36 AM  
Joined: 4/23/2012 Last visit: 7/22/2012 Posts: 36 Rating: (1) 
hii Ahmed, i have done this with OB32 very thanks! :) , you can see the block in attachment. i still have a question. can i use this output graph (MD500) as input of FC105 Scalling value? well MD105 is real. is it possible if i convert it into Integer in order to be as input of FC105? thanks 
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