Configuring Analytics with PI AF Discussion Forum

SeanSchneider in Configuring Analytics with PI AF Discussion Forum3 weeks ago (Show more)

Weighting Factor from the Optimizing Asset Analytics Module

We would just like to ask regarding the computation of the Weighting Factor (which is AvgElapsed/AvgTrigger), why is it that the AvgElapsed is in milliseconds and the AvgTrigger is in seconds.

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SeanSchneider (to jbyrns) 2 weeks ago (Show more Show less)

Understood Jeff! Thank you for your time and clarifications on this matter! Have a great week

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rjfaulco in Configuring Analytics with PI AF Discussion Forum3 weeks ago (Show more)

Analysis Techniques to Determine Position Relative to Curve

I am fairly new to Pi AF and its capabilities and am trying to learn the best way to accomplish my goals. If this question is not appropriate for this forum then I apologize, but I am running out of resources that may be able to help with this task. Any help would be extremely helpful at this point. I am trying to determine the distance away… (Show more)

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ChristophRose (to rjfaulco) 2 weeks ago (Show more Show less)

You might also take a look at the curve function: For a given x, returns the value of a piecewise linear interpolation function defined by the set of n points (x1,y1)...(xn,yn). Since your distance appears to be simply the vertical distance (I might be wrong about this), that should be enough to get you where you want. Depending on the…

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TEBaldauff in Configuring Analytics with PI AF Discussion Forum1 month ago (Show more)

Opposite of FindEQ, when was the last time a tag = a value

I know how to use FindEQ in an AF Analysis but I am looking for how to return a timestamp for when a tag value last = a number rather than finding the first time it equaled that value within a given time snapshot. Thanks for your help!

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skwan (to TEBaldauff) 1 month ago (Show more Show less)

I wish they were all this easy :-). Please be aware that all the FindXX and TimeXX functions are expensive in that they all involve intensive searches and summaries. I would suggest you keep an eye on performance and ensure you're using sensible parameters for this functions. As an example, doing a yearly TimeEQ every 2 seconds would cause a…

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Theangelawhite in Configuring Analytics with PI AF Discussion Forum1 month ago (Show more)

Cloud environment doesn't load, or loads without PI on it

I started the VM and clicked to launch in browser, but it wouldn't connect. I tried again several times and it finally connected, but the desktop doesn't have the links to PI clients like I have seen in other classes. I tried to get them from the start menu, but it doesn't appear they are on the machine at all.

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gmadingou (to Theangelawhite) 1 month ago (Show more Show less)

Hi Angela, Thanks for the update. The issue may come from your browser. You might need to install the latest version of your browser (Preferably Chrome). Regards

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heinzea in Configuring Analytics with PI AF Discussion Forum2 months ago (Show more)

Calculation with questionable data

Hello, our customer collect data from MBUS for energy data. There are 800 Tags collected. We need to know if a MBUS is bad and we need also to know the last good recorded Value. The Analysis should keep runing with the last knowing good value. Therefore we decieded to set up the Interface that questionable values are stored in PI with Value and… (Show more)

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ChristophRose (to heinzea) 2 months ago (Show more Show less)

Maybe you could do something like the following:

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RachelP in Configuring Analytics with PI AF Discussion Forum3 months ago (Show more)

Can an analysis reference the status of child elements' attributes?

Example: I need to do an analysis on a centralized modular solar inverter. The PI AF structure for these inverters is "Inverter\Inverter Module," where the analysis sits on the "Inverter" parent element, and the "Inverter Module" is the child element that has attributes I need to reference. Depending on the manufacturer, there are anywhere… (Show more)

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RachelP (to bbregenzer) 3 months ago (Show more Show less)

Thank you so much. These are some great ideas as to how I can get this accomplished until the filter expression on roll ups is implemented. I will definitely upvote it!

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Victor in Configuring Analytics with PI AF Discussion Forum4 months ago (Show more)

How can I fix this issue? Variable1: Invalid operation: [number] - [number]

I'm trying to build some analysis templates for an element template I created in PI system explorer. At the moment all I want to do is compute a basic calculation using attributes Variable 2 and Variable 3, which are all linked to a PI tag Calc The calculation I want to perform is Variable 4 = Variable 2 – Variable 3. How can I fix this… (Show more)

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Anibal_GF (to sraposo) 4 months ago (Show more Show less)

Yes, the input is a PI Point, the configuration string is like you said and the value type is Double. The expresion return a "Calc Failed" when there is a gap at the consulting timestamp The picture show the data in the tag PI point near "y" in the picture above. Regards.

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Arti Rajagopalan in Configuring Analytics with PI AF Discussion Forum1 year ago (Show more)

Looping through array values returned by RecordedValues function in AF Analytics

I am working on an AF Analytics calculation that requires me to loop through all the values received for a PI tag received in past 2 minutes. Depending on the data quality of the tag, the value is included/excluded in the calculation. For example: RecordedValues('dischargeIn|value','*-2m','*') expression returns 0 or more values. I want to… (Show more)

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Dan Fishman

(to TimCarmichael) 4 months ago (Show more Show less)

Glad I could help! The community has saved me dozens of hours this year!

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bjohanneck in Configuring Analytics with PI AF Discussion Forum5 months ago (Show more)

How do I check a previous PI Value for Numeric status?

I'm familiar with using BadVal(Float('Attribute')) to return a True or False as a Numeric status. I'm also familiar with using PrevVal or PrevEvent for various purposes, but I can't successfully nest PrevVal or PrevEvent with BadVal. I'm looking for something like this... PrevEvent('Attribute',BadVal(Float('Attribute')),'*')

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bjohanneck (to LalBabuShaik) 5 months ago (Show more Show less)

Excellent, this was my first use of arrays and this solution worked well. Thanks for the detailed explanation and screenshots Lal, I solved my problem and have a better understanding. I appreciate your help.

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bjohanneck in Configuring Analytics with PI AF Discussion Forum5 months ago (Show more)

Nested PrevVal Not Returning Data When Data Exists

I'm building an Analysis Template and I have a PrevVal('Attribute Name','*') variable that is returning the correct Value at Evaluation, whereas I have two subsequent problematic variables: PrevVal('Attribute Name',PrevVal('Attribute Name','*')) returns No Data PrevVal('Attribute Name',PrevVal('Attribute Name',PrevVal('Attribute… (Show more)

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bjohanneck (to totsengue) 5 months ago (Show more Show less)

Thank you Lal and Thonya! Nesting PrevEvent inside of PrevVal worked & makes sense. I was missing that I needed to combine the two. I appreciate your help.

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