I would like to offset a performance equation that when one tag writes a value that the PE tag writes the value 45 minutes later.
Then when the value changes 45 mins later it updates.
Is this possible?
With PI AF Analytics and PI Data Archive 2015 you have future data capabilities, so you could write the value 45 minutes into the future and then deal with it appropriately.
Thanks, If I write the data using future data and use that tag in a display will it trigger a display change 45 mins later?
It will depend on the time context of your display, but generally yes. You will need an updated ProcessBook (part of the 2015 update) to make use of Future Data PI Points though for symbols other than a trend. Haven't explicitly tested PI Coresight hosted displays though.
Yep! We have to wait for PI Data Archive 2015 in a few weeks! ACE can manipulate the time stamp ; however, you cannot be more than 10 minutes into the future unless using PI Data Archive 2015.
What is the equation your PE should perform? Only coping the value from another tag 45min later?
Could you use the opposite approach: set your PE to run periodically evaluating if the other tag had a new value 45min before?
PE = IF prevevent('OtherTag', '*') = '*-45m' then prevval('OtherTag', '*') else noOutput()
That equation wouldn't work if you had more than one value on this 45 minutes window!
So, if you explained a little more your needs, maybe we could help you better...
Retrieving data ...