1/29/2009 2:38 PM | |
Joined: 9/27/2006 Last visit: 9/21/2024 Posts: 12282 Rating: (2684)
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Hello Iyyappan S; The value 27648 has simply been selected as the maximum normal range value of any analog signal transfered to the CPU by a Siemens analog module.This numerical value is independant of the resolution of the particular analog module used (this is a way to standardize all scaling of analog readingsin the processor) For unipolar data, this would mean 0 to 27648 represents full range; above 27648, overrange, below 0, underrange.See the attached illustration for the equivalent numeric values iof a 4-20 mA or 0-20 mA signal. The basic configuration of the analog modules is best explained in the S7-300 module Data manual: http://support.automation.siemens.com/WW/view/en/8859629 Look at the chapters on Principles of Analog value processing and Representation of the analog values of analog modules. Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 1/29/2009 2:40 PMLast edited by: dchartier at: 1/29/2009 2:40 PMLast edited by: dchartier at: 1/29/2009 2:40 PM |
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This contribution was helpful to29 thankful Users |
1/29/2009 5:27 PM | |
Joined: 10/12/2006 Last visit: 9/17/2024 Posts: 206 Rating: (25) |
Hi, read this in technical forum ... Analog Value regards zenta |
2/4/2009 8:39 AM | |
Joined: 12/6/2006 Last visit: 7/8/2024 Posts: 92 Rating: (0) |
Dear Mr.Ayman Elotaify, Thanks Very Much Regards Iyyappan S |
2/4/2009 9:13 AM | |
Joined: 5/28/2008 Last visit: 9/21/2024 Posts: 4515 Rating: (839) |
Hello Iyyappan, You are welcome. Greatings. |
Ayman Elotaify |
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This contribution was helpful to3 thankful Users |
6/17/2009 11:29 AM | |
Joined: 4/19/2008 Last visit: 9/3/2024 Posts: 1525 Rating: (159) |
Hi, Please find the attachement in that you can find the answer for Analog Value. Ammy AttachmentAnalog Module.pdf (8182 Downloads) |
Ammy |
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This contribution was helpful to11 thankful Users |
5/30/2010 7:41 PM | |
Posts: 6 Rating: (0) |
thank you very much MR.Ayman |
6/19/2010 3:15 PM | |
Posts: 23 Rating: (0) |
Have a look at the following attachment, extracted from the following manual: http://support.automation.siemsn.com/WW/view/en/8859629S7-300 Module Data manualChapter 5: Analog value representation Table 5.9: 0-20 mA and 4-20 mA analog values. |
4/8/2016 10:37 PM | |
Joined: 5/28/2008 Last visit: 9/21/2024 Posts: 4515 Rating: (839)
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Hello, Yes you are right... Please see my answer from other thread about the resolution issue and also please see the attached file.
For 0-20mA AI, For the 16 bit resolution, the minimum increment / decrementunits = 1 (please revise the attachments) in the above thread link. Now let us assume we have 8-bit resulion AI module. AttachmentAnalog Input Representation.pdf (2472 Downloads) |
Ayman Elotaify |
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This contribution was helpful to2 thankful Users |
11/21/2018 1:53 PM | |
Joined: 3/31/2018 Last visit: 3/15/2024 Posts: 8 Rating: (0) |
Mr. Dcharitier, It was very helpful...
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Regards - Haresh KM |
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2/19/2020 12:46 PM | |
Posts: 1 Rating: (1) |
Possible answer: 2^15*0.85=32768*0.85=27852=6CCC the rounded of 6CCC is 6C00=27648 |
2/26/2020 1:55 PM | |
Posts: 9 Rating: (1) |
Dear IYYAPPAN, If i am able to understand your point kindly check this table: |
3/3/2023 2:41 PM | |
Joined: 1/8/2021 Last visit: 6/1/2023 Posts: 1 Rating: (0) |
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4/23/2023 3:57 PM | |
Joined: 5/28/2008 Last visit: 9/21/2024 Posts: 4515 Rating: (839)
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Hello, First, I just wanted to highlight that the analog values are represented in 16-bit memory size. Its data type is INT and not WORD. Both Integer and WORD can be represented in 16-bit but there is a difference in the data structure between them. The Word (16-bit size) has a bits from No. 0 to No-15 Bit No. 15 is dedicated for sign
And as per 2nd post from dchartier here, see the attached picture,
For a better understanding of different data types, see Section 23.3, For INT data type see section 23.3.2.1 of the following manual SIMATIC Programming with STEP 7 |
Ayman Elotaify |
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