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about SCALE_X and NORM_X

Created by: crystal_group at: 10/23/2009 5:33 PM (7 Replies)

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10/23/2009 5:33 PM	Rate (1)
crystal_group Regular Member Joined: 8/12/2009 Last visit: 2/22/2012 Posts: 12 Rating: (1)	Hello! I have a big problem with SCALE_X and NORM_X. I have a analog sensor with 0..20 mA Output. If I used the first step,NORM_X min=0, max= 32767 (max val. for integer), value %IW100 and out %DB100.DBD0. The second step,SCALE_X min=0, max=50, value %DB100.DBD0, and out %DB100.DBD4. I have scaling but is wrong. I have 8A to %DB100.DBD4, but correct is 0.7A Please help me.

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10/23/2009 9:01 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 1/27/2020 Posts: 3804 Rating: (1057)	crystal_group Hello! I have a big problem with SCALE_X and NORM_X. I have a analog sensor with 0..20 mA Output. If I used the first step,NORM_X min=0, max= 32767 (max val. for integer), value %IW100 and out %DB100.DBD0. The second step,SCALE_X min=0, max=50, value %DB100.DBD0, and out %DB100.DBD4. I have scaling but is wrong. I have 8A to %DB100.DBD4, but correct is 0.7A Please help me. Have you alread take a look atthese TIP /tf/WW/en/Posts/31698#top
	Denilson Pegaia Siemens Industry Sector Technical Support
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10/24/2009 10:26 AM	Rate (0)
crystal_group Regular Member Joined: 8/12/2009 Last visit: 2/22/2012 Posts: 12 Rating: (1)	why you used 27648 (correspondent at 20mA or 10V) and not you used 32767, for maxim value. The 27648 is corect for all analog imput or analog output (indifferent of bit number at rezolution), at PLC S7 1200? I creat the test project and is all OK, for maxim value 27648.

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10/26/2009 3:03 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 1/27/2020 Posts: 3804 Rating: (1057)	Hi, there are many other posts in the forum about "why the 100% of the scale is 27648?". I understand that it was necessary a overload reserve, but why 27648 and not 27645 or any other number, I don't know. Important is that it is a constante in S7-300, 400 and 1200 family.
	Denilson Pegaia Siemens Industry Sector Technical Support
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10/21/2012 10:39 PM	Rate (0)
metwally mustafa Silver Member Joined: 10/10/2010 Last visit: 12/25/2019 Posts: 296 Rating: (13)	thank you

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4/15/2013 3:26 PM	Rate (0)
toinou222 Member Joined: 4/15/2013 Last visit: 9/7/2013 Posts: 11 Rating: (0)	hello is it normal that the OUT value is superior than the MAX i choosed for both scale_x and norm_x ??? i use a apg100 pressure sensor and the range of pressure is 0.001-1000 can someone explain me ? Attachment canapasdsens.gif (880 Downloads)

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4/15/2013 6:17 PM	Rate (1)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 1/27/2020 Posts: 3804 Rating: (1057)	Hi, If I take in account analog value processing, there is the possiblitiy of a overrange of ~10%. About NORM_X and SCALE_X, they make no limitation of the siganl, just a scale conversion. I suggest, in your case, to place a LIMIT block betweenNORM_X and SCALE_X
	Denilson Pegaia Siemens Industry Sector Technical Support
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This contribution was helpful to 1 thankful Users toinou222

4/17/2013 9:31 AM	Rate (0)
toinou222 Member Joined: 4/15/2013 Last visit: 9/7/2013 Posts: 11 Rating: (0)	thank you ~~but how can i have a good precision between 1 and 0.001 ? because my range is 1000-0.001 and the signal have to pass from 1000 to 0.01 or 0.001 precisetly~~ ~~attachement --> i did this to avoid a jump of value but it works without good precision...~~ ~~--> how to do a logaritmic/10 scale ???? it's maybe the solution !~~ ~~i have to do p=10^(v-6) how can i have le voltage value ??~~ Attachment capt_m_can5.gif (723 Downloads)
	Last edited by: toinou222 at: 4/29/2013 11:44 AM Last edited by: toinou222 at: 4/19/2013 9:59 AM Last edited by: toinou222 at: 4/18/2013 12:15 PM Last edited by: toinou222 at: 4/17/2013 10:03 AM
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