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Archiving Calculation Changes in PI

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Hello,

This question is best asked using an example.

 

I currently have a tag that has a calculation hardwired into the code.

 

for 1/1/2000 to 5/5/2013 we calculated the tag (I95-000-FR) to equal  A * 36 / 2000

 

I now want the same tag to equal B * 36 / 1000 * 5 for any dates AFTER 5/5/2013

 

After the update, I want to be able to run PI in excel for 1/1/2013 to 5/23/2013 and all the data prior to 5/5/2013 to be calulated the OLD way and all data after 5/5/2013 to be calculated the NEW way.

 

I also want to be able to show what equation was used on any given day/time period.

 

 

So, my question:

Is there a way maintain the historic values (any time before 5/5/2013) and keep a record that the equations used at that time?

 

Does PI have the capability of archiving old equations?

 

I do not want to have to create a new tag.

 

 

 

As a note. I am not a "PI-guy", so I do not know coding. I just use it every day.

 

 

Thank you.

 

 


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