4/29/2012 1:01 PM  
Joined: 8/18/2011 Last visit: 12/3/2018 Posts: 32 Rating: (1) 
Hello. I have a question. My level transmiter have 420mA output signal, but 4mA is full and 20mA is empty.Really, in header is 80% but s71200 it shows 1516%. How scale this signal that same level showed. 
Last edited by: O_Moderator at: 4/30/2012 12:42 PMnew subject after splitting from /tf/WW/en/Posts/31698#top 

4/29/2012 5:31 PM  
Joined: 5/28/2008 Last visit: 2/19/2019 Posts: 4104 Rating: (753) 
Hello, I do not know if we are talking here about S71200 or 300 or what. But let me suggest to enter value of: Hi_Lim = 0% (this value is corresponding to 20 mA) which means level = 0% & Lo_Lim = 100% (this value is corresponding to 4 mA) which means level = 100%

Ayman Elotaify 

4/29/2012 5:57 PM  
Joined: 8/18/2011 Last visit: 12/3/2018 Posts: 32 Rating: (1) 
If I give in ScaleX min = 100% and max = 0% then scaleX not work. 
4/29/2012 6:23 PM  
Joined: 7/7/2010 Last visit: 2/22/2019 Posts: 7057 Rating: (1154) 
The input is 020mA and your input is 420mA. When you have 4 mA, the unscaled input counts is 4/20*27648 (counts * ratio of input vs full range). If you Normalize the signal for 4mA worth of counts to 20mA worth of counts, then scale 100 to 0 % you will get a much more accurate representation of your level sensor. Full Scale counts (20mA) = 27648 counts.= 0% 4mA/20mA*27648 = 4mA counts = 100% Use the NORM/SCALE functions. See the instruction help for more details. 
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4/30/2012 3:59 PM  
Joined: 8/18/2011 Last visit: 12/3/2018 Posts: 32 Rating: (1) 
I try to make write so as but not work. I try turn signal using 010V. 
4/30/2012 4:21 PM  
Joined: 7/7/2010 Last visit: 2/22/2019 Posts: 7057 Rating: (1154) 
Maybe this FAQ will help: https://support.automation.siemens.com/WW/llisapi.dll?query=norm+scale+tia+portal&func=cslib.cssearch&content=adsearch%2Fadsearch.aspx%3Ftab%3D2&lang=en&siteid=csius&objaction=cssearch&searchinprim=_searchinprim_&nodeid=99&x=16&y=8&cssearchengine=NEW 
Last edited by: huggy_d1 at: 4/30/2012 8:43 PMAdded attachment using NORM/SCALE with inverter Helpful? Rate it. 

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4/30/2012 5:30 PM  
Joined: 12/30/2009 Last visit: 10/24/2014 Posts: 89 Rating: (12) 
Maybe this example will help you. 
Last edited by: Gorp at: 4/30/2012 5:36 PMUpdated the attachment , I forgot to show the sample in online mode.... Always read the manuals first. 

This contribution was helpful to2 thankful Users 
5/3/2012 11:06 AM  
Joined: 8/18/2011 Last visit: 12/3/2018 Posts: 32 Rating: (1) 
I thank, I wanted to get it exactl. 
5/3/2012 2:50 PM  
Joined: 3/18/2008 Last visit: 8/24/2017 Posts: 559 Rating: (84) 
Dear mal_er, There is a very basic fundamental on scaling. You can also make your own logic, if the readymade library block is not available. First of all you have see the maximum count for the maximum input value & Minimum count for the minimum input value. In your case minimum input value is 4 mA & Count would be 5530 & for input value 20mA count will be 27648. So you just have to write the equation y=mx+c Here Y will be count value & X will be in the scaling parametrs means if you want scale 420 mA is equal to 0100 then X (01100) would be scaling parameters. Just solve this eqaution & find out the m & c values. Now make logic after solving these m & c parameters & you will get the scaling very easily. I hope this is very much helpfull to all who want to develop their own scaling block. 
THANKS & REGARDS, 

5/22/2012 12:44 PM  
Joined: 5/1/2009 Last visit: 12/8/2018 Posts: 139 Rating: (1) 
Dear mal_er, As me know 4ma mean 0 value and 20ma mean 27648 for example If I measure temp. from 0 to 100 c that mean 4ma i/p mean 0c and 20ma mean 100c So how can using this equation y=mx+c to solve this method and what m and c means thanks for your consern 
Best regard 

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