Emerson Exchange 365

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Process Value Statistics

i have a module which records wind speed and would like to do some fancy statistics to display, for example

 

max, min, ave daily pv

max, min, ave hourly pv

 

having looked through the deltav 11.3.1 function blocks im unable to find an easy way to acheive this. Any ideas how i would approch this please?

 

Thanks

 

• DeltaV

Stuart Jolley

• 17 Apr 2015 11:44 AM
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2 Replies

• Aniruthan

  

  • 17 Apr 2015 11:59 AM

  May be ISEL block will help you to solve the problem.

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• Matt Stoner

  

  • 17 Apr 2015 12:52 PM

  Stuart,

  Unfortunately there is no "easy" button or function blocks for this and you will need to write custom logic to get this accomplished.

  Some of the things to think about with this are:

  • How often do you sample/record a value to do the calcuations
  • Are averages rolling (last 60 min) or block (last clock hour)
  • Saving the values to allow a download of the module and not lose the previously recorded values (Data saved in another module or set the module Preserve Download behavior to user-defined and critical block values)

  This can be accomplished because we had a project a number of years back that needed this funcationality and we wrote some action or calc logic to get it done.

  Regards,

  Matt

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