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scaling funcation

Created by: hari haran at: 4/11/2014 4:48 PM (13 Replies)

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4/11/2014 4:48 PM	Rate (0)
hari haran Advanced Member Joined: 3/30/2014 Last visit: 12/13/2023 Posts: 1 Rating: (0)	dear sir ihave using sm331- 7kf 02-0ab0 analoug module to connect RTD i am used scaling funcation is used for FC 105 but i dont know what valu to set HI limit&LO limt plese help me.

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4/11/2014 5:15 PM	Rate (1)
Ste39 Platinum Member Joined: 1/21/2013 Last visit: 9/4/2024 Posts: 4620 Rating: (707)	Hi hari haran, You don't need FC 105 for RTD, convert the analog value to REAL and divide by 10.0. or how use FC105 block to read PT100 RTD feedback value

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This contribution was helpful to 2 thankful Users IBN-Service metwally mustafa

5/17/2014 10:26 PM	Rate (0)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 9/9/2024 Posts: 4515 Rating: (839)	Ste39 Hi hari haran, You don't need FC 105 for RTD, convert the analog value to REAL and divide by 10.0. or how use FC105 block to read PT100 RTD feedback value Hello, Dividing by 10 is not applicable for AI module 6ES7 331-7KF02-0AB0. It is applicable for 6ES7 33-KF02-0AB0. Hope this helps.
	Ayman Elotaify
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5/18/2014 8:51 AM	Rate (0)
IBN-Service Posts: 8946 Rating: (999)	Ayman Elotaify Ste39 Hi hari haran, You don't need FC 105 for RTD, convert the analog value to REAL and divide by 10.0. or how use FC105 block to read PT100 RTD feedback value Hello, Dividing by 10 is not applicable for AI module 6ES7 331-7KF02-0AB0. ... I can not agree with you, Ayman. Dividing by 10 is just a form of scaling an applicable for all AI because you do it in the Step7 Software.
IBN-Service Posts: 8946 Rating: (999)
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This contribution was helpful to 1 thankful Users Ste39

5/18/2014 10:16 AM	Rate (0)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 9/9/2024 Posts: 4515 Rating: (839)	IBN-Service Ayman Elotaify Ste39 Hi hari haran, You don't need FC 105 for RTD, convert the analog value to REAL and divide by 10.0. or how use FC105 block to read PT100 RTD feedback value Hello, Dividing by 10 is not applicable for AI module 6ES7 331-7KF02-0AB0. ... I can not agree with you, Ayman. Dividing by 10 is just a form of scaling an applicable for all AI because you do it in the Step7 Software. Hello, let me tell example to explain my point of view: For module6ES7 331-7KF02-0AB0, connected to a PT100 through a converter (4-20mA). I assumed a converter here because you cann't connect this module directly to a PT100. The count value you will read in the PIWxx address is between 0 & 27648 After converting this value to real and divide by 10.0, the divided value will be 2764.8 To monitor the physical value, dividing by 10.0 for this module will not be the solution, you have to use SCALE function FC105. For module6ES7 331-1KF02-0AB0, connected to a PT100. The count value you will read in the PIWxx address is temp. multiplied by 10. After converting this value to real and divide by 10.0, the divided value will equal to temperature. So in this case no need forSCALE function FC105. *Applicable if you adjusted HW config settings correctly. Hope this helps.
	Ayman Elotaify
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5/18/2014 10:31 AM	Rate (0)
IBN-Service Posts: 8946 Rating: (999)	Ayman Elotaify ...Hello, let me tell example to explain my point of view: Dont look at module, dont look at FC105, look here: L PIWxxx // Adress of AI with PT100 ITD // integer to longint (takes care of sign) DTR // transform to real format L 0.1 // Multiplicator (makes 100 => 10.0) *R // Multiplication of real - numbers T DWORD // some variable in real format contains scaled value (i.e. temperature) now. That is already a scaling in ist easiest way. You can do it with every value. I believe, you already know that?
IBN-Service Posts: 8946 Rating: (999)
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5/18/2014 10:32 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 9/9/2024 Posts: 3019 Rating: (1054)	Ayman Elotaify Dividing by 10 is not applicable for AI module 6ES7 331-7KF02-0AB0. For module6ES7 331-7KF02-0AB0, connected to a PT100 through a converter (4-20mA). I assumed a converter here because you cann't connect this module directly to a PT100. Well, someone better tell Siemens then to remove PT100 from thetechnical spec of the 6ES7331-7KF02-0AB0 as well as the S7-300 Moduledata manual (or alternatively reconsider the given advice ).
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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5/18/2014 10:42 AM	Rate (0)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 9/9/2024 Posts: 4515 Rating: (839)	fritz Ayman Elotaify Dividing by 10 is not applicable for AI module 6ES7 331-7KF02-0AB0. For module6ES7 331-7KF02-0AB0, connected to a PT100 through a converter (4-20mA). I assumed a converter here because you cann't connect this module directly to a PT100. Well, someone better tell Siemens then to remove PT100 from thetechnical spec of the 6ES7331-7KF02-0AB0 as well as the S7-300 Moduledata manual (or alternatively reconsider the given advice ). Hi Really it is not exist,fritz Here's the tech specs for6ES7331-7KF02-0AB0 technical description of6ES7331-7KF02-0AB0 SIMATIC S7-300, ANALOG INPUT SM 331, OPTICALLY ISOLATED, 8AI, RESOLUTION 9/12/14 BITS, U/I/THERMOCOUPLE/RESISTANCE INTERRUPT, DIAGNOSTICS; 1X20PIN REMOVE/INSERT W. BACKPLANE BUS You can not configure this module as RTD for PT100 std. as for6ES7331-1KF02-0AB0 technical description of6ES7331-1KF02-0AB0 SIMATIC S7-300, ANALOG INPUT SM 331, OPTICALLY ISOLATED, 8 AI, 13 BIT RESOLUTION, U/I/RESISTANCE/PT100, NI100, NI1000, LG-NI1000, PTC / KTY, 66 MS MODULE UPDATE, 1 X 40 PIN
	Ayman Elotaify
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5/18/2014 10:48 AM	Rate (0)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 9/9/2024 Posts: 4515 Rating: (839)	IBN-Service Ayman Elotaify ...Hello, let me tell example to explain my point of view: Dont look at module, dont look at FC105, look here: L PIWxxx // Adress of AI with PT100 ITD // integer to longint (takes care of sign) DTR // transform to real format L 0.1 // Multiplicator (makes 100 => 10.0) *R // Multiplication of real - numbers T DWORD // some variable in real format contains scaled value (i.e. temperature) now. That is already a scaling in ist easiest way. You can do it with every value. I believe, you already know that? Dear IBN, Yes it is scale but you can not get the physical quantaty from it if you work with module 7KF. You have to look at module to know what the needed function you will need to get the physical value and make further programming within your software. For module 331-1KF02 , the given code from your side is perfect and applicable for example I have given in my prev. posts.
	Ayman Elotaify
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5/18/2014 11:03 AM	Rate (0)
IBN-Service Posts: 8946 Rating: (999)	Ayman Elotaify .. but you can not get the physical quantaty from it if you work with module 7KF.... What does that means, please?
IBN-Service Posts: 8946 Rating: (999)
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