Skip to Content

Register Login

Industry Online Support

Technical Forum

Navigation

SCALE and UNSCALE

Created by: Denilson Pegaia at: 6/24/2009 5:38 PM (57 Replies)

Rating (23)

Thanks 84

Result pages:: |; 1 | 2 | 3 | 4 | 5 |...; |

58 Entries

Entries per page: 10 | 20 | 50 | all

6/24/2009 5:38 PM	Rate (15)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 10/4/2024 Posts: 4349 Rating: (1446)	Hi, The theme “scale analogical signals” is always recurrent in any PLC families. The S7-1200 has two instructions to do it: SCALE_X and NORM. I wrote a FAQ suggestion about the theme, which was approved but not yet published. In this mean time, I let here a draft of it. I attached also a project with a version for S7-1200 of the S7-300/400 FC105 / 106. It was not tested, so if some one tests it please let know if it works. NOTES: - V11 version was posted in the follow post of this TIP (page2). - V12 version was posted in the follow post of this TIP (page3). news on V12: New Blocks (that could be used also in S7-1500): SCALE_LREAL / UNSCALE_LREAL (for the case where is necessary an extra - accuracy in the scaling) RESCALE / RESCALE_LREAL (to scaling REAL to REAL or LREAL to LREAL) SCALE_TC_RTD (to convert analogical inputs for Termo coupler or standard RTD) SCALE_ RTD_climatic (to convert analogical inputs for climatic RTD) Attachment Scale.zip (14765 Downloads)
	Last edited by: Pegaia at: 3/3/2013 5:09 PM Last edited by: Pegaia at: 3/3/2013 5:07 PM Last edited by: Pegaia at: 8/29/2011 3:56 PM Note for V11 Last edited by: Pegaia at: 2/18/2010 10:21 AM The new version has news blocks for SCALE / UNSCALE of 4..20mA done by analog modules that has just 0..20mA. Last edited by: Pegaia at: 7/27/2009 2:00 PM I have tested the blocks. Here is the revised version. Denilson Pegaia Siemens Industry Sector Technical Support
Suggestion To thank Quote Answer
This contribution was helpful to 53 thankful Users luciferC4 yang simatic10 Paulo Walker Ayman Elotaify jucagu franxi1970 Kontrol accolade crazyCow Ferran IqaBossy allermand Out Control GOCHEV Jacques-Olivier FAR_EAST Damayanti wintersonata Nicky123 Patrix Rollex thanhda FelipeATMA Stuntman iNano Tinh.3E vuong49ctu sk_kopec Mirosz tarik147 Gustkun alany zzVss davinchi shadesman farah.moh Maves Especie Laurids marjan_c amerevis ZHK Mo.Sa Thanh Tuan Monik_Modi Gabriel de Oliveira alecyang205 LangtuGa OMKRIS2017 genious2015 JessnPack

6/26/2009 10:41 AM	Rate (0)
dzwilu Bronze Member Joined: 12/3/2008 Last visit: 3/22/2022 Posts: 146 Rating: (4)	I did not test your program. But I've tested scaling on S7-1200. Using NORM-X and SCALE-X to scale an analog +/- 10V signal, into a [-10;10] range. Everything works fine and is easier than scaling in s7-200... As soon as I get the 1200, I'll try to test the program U've uploaded Best regards dzwilu

Suggestion To thank Quote Answer
This contribution was helpful to 3 thankful Users sk_kopec Thein Htoon Lwin blacko

6/29/2009 5:05 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 10/4/2024 Posts: 4349 Rating: (1446)	Thanks
	Denilson Pegaia Siemens Industry Sector Technical Support
Suggestion To thank Quote Answer

8/25/2009 12:46 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 10/4/2024 Posts: 4349 Rating: (1446)	Hi, Idid a fast test.They areok.
	Denilson Pegaia Siemens Industry Sector Technical Support
Suggestion To thank Quote Answer
This contribution was helpful to 2 thankful Users Yu-wen Tang Trung Peter

6/25/2010 1:11 PM	Rate (0)
c-ba Member Joined: 2/1/2010 Last visit: 8/1/2022 Posts: 2 Rating: (0)	Hi, thank you for these useful FC. I've modified the 4-20scale (FC108) for scaling a 4-20 mA input signal between two process value limits (HI_LIM e LO_LIM). Maybe it isn't an elegant solution but it works fine. What do you think about it? Attachment scale_4-20 (tested).zip (5279 Downloads)

Suggestion To thank Quote Answer
This contribution was helpful to 3 thankful Users phanthetien FAR_EAST thanhda

7/7/2010 11:54 AM	Rate (0)
c-ba Member Joined: 2/1/2010 Last visit: 8/1/2022 Posts: 2 Rating: (0)	This is a new version of 4-20mA SCALE FC (FC105): if I<4 mA OUT=LO_LIM if I>20 mA OUT=HI_LIM if I<3,9 mA or I>21 mA ---> RET_VAL=W#16#8 (anomaly) Attachment SCALE4_20new (tested).zip (5297 Downloads)

Suggestion To thank Quote Answer
This contribution was helpful to 3 thankful Users luciferC4 Walker Denilson Pegaia

6/17/2011 10:25 PM	Rate (0)
johnchabin Regular Member Joined: 11/10/2010 Last visit: 11/7/2023 Posts: 2 Rating: (0)	Careful of the original attachment. SCALE_4..20 [FC108] has errors. In NW3, NW4, and NW5, #aux2 should be #LO_LIM. With these changes, I was able to delete NW2. Or am I missing something? The original was a good starting point, as I like the use of NORM_X and SCALE_X. In the past, Ihave donethe scaling mathematically, but I like this method better.
	Last edited by: johnchabin at: 6/17/2011 10:26 PM Last edited by: johnchabin at: 6/17/2011 10:26 PM
Suggestion To thank Quote Answer

6/20/2011 1:31 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 10/4/2024 Posts: 4349 Rating: (1446)	Hi, the use of the FC108 is to read 4..20mA in modules that are just enable to work with 0..20mA scale. In this context it is not possible to use directly the lo lim in the conversion.
	Denilson Pegaia Siemens Industry Sector Technical Support
Suggestion To thank Quote Answer

7/6/2011 11:04 AM	Rate (0)
Jacques-Olivier Posts: 23 Rating: (1)	Hi Mr Pegaia, Sorry, my question will seem stupid, but my PLC is set on 0..10V, and I can't change it to 0..20mA, the field is greyed inPLC config page. Is there something to do to unlock ? Thanks
Jacques-Olivier Posts: 23 Rating: (1)	Last edited by: Jacques-Olivier at: 7/6/2011 1:09 PM Or is it just that the CPU (1214C DC/DC/DC) can''t use 0..20mA but only voltage signal ? Because I''ve just add a SM1231 8AI and it works !
Suggestion To thank Quote Answer

7/6/2011 12:08 PM	Rate (1)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 10/4/2024 Posts: 4349 Rating: (1446)	Hi, I'm thinking that you talk about the analogic IO of the CPU. Am I right? This is just for 0..10V. If you need to read current, you should place a "shunt" resistor of 500 Ohms parallely to the input.
	Denilson Pegaia Siemens Industry Sector Technical Support
Suggestion To thank Quote Answer
This contribution was helpful to 5 thankful Users Jacques-Olivier nata ysp Gabriel de Oliveira Vivek Kansara chienxq

Result pages:: |; 1 | 2 | 3 | 4 | 5 |...; |

58 Entries

Entries per page: 10 | 20 | 50 | all

|

Share this page:

Share this page on...

Follow us on