Configuring Analytics with PI AF Discussion Forum

bjohanneck in Configuring Analytics with PI AF Discussion Forum1 week 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) 1 week 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 Forum2 weeks 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) 1 week 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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bjohanneck in Configuring Analytics with PI AF Discussion Forum2 weeks ago (Show more)

Selecting Specific Time Interval for Analysis Variables

When making an analysis template - how do I specify a time to check a specific PI Value? Similar question for checking Questionable flags. I have 30 minute data (4 to 6 different values, once every 30 minutes), and in my analysis I need to check numerous things...some of those things being values (or their Questionable flags) at the present… (Show more)

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bjohanneck (to totsengue) 2 weeks ago (Show more Show less)

Alright I got there using PrevEvent and PrevVal, and nesting them as necessary. Now I see that... PrevEvent('Attribute Name','*') returns the time of the previous event, PrevEvent('Attribute Name',PrevEvent('Attribute Name','*')) returns the time of the event two prior and so on. Interestingly though I now have a new question...I'll start…

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

I'm trying to launch my Cloud class environment but am getting ssoadfsbe.osisoft.com refused to connect...not sure what's wrong.

No details, just the message after I click Launch:

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totsengue

(to Trish) 3 weeks ago (Show more Show less)

Hi Trish, Do you mind sending me screenshots of your analysis so i can confirm a few things before we opt for the upgrade (you don't have to post it here, you can email them to me if they have proprietary information). Thanks, Thonya

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Trish in Configuring Analytics with PI AF Discussion Forum4 weeks ago (Show more)

Configuring Analytics with Pi AF class - problem with output variables

I've just completed the first class exercise where the creation of an analysis is required. I've done the work but when I look at the attributes tab on the HOU.Press.01 element, the new attributes that were mapped from the variables in the exercise are showing as Pi Point not found. The example shows the output of the variables. When I right… (Show more)

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Trish (to gkhairallah) 3 weeks ago (Show more Show less)

Georges, It’s not permissions – I clicked on red Exclamation warning icon on the OEE Measurements analysis on Friday afternoon and got the below (it’s indicating that the analysis is looking for these points in the wrong database even though the attribute is getting data from the right one – see second little screen capture below this one): …

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

I have access to cloud environment and I have loaded this example kit as well.The points in the attributes do not simulate. They are in "Pt Created" status. Please help.

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SwapnilEquinox (to LalBabuShaik) 1 month ago (Show more Show less)

Thanks Lal Babu, you are always there for rescue. I was just taking up this exercise and I had forgotten to Enable the analyses, which I realized after your reply. Yes all of the analyses have started running incl the 'Gas Gravity Avg' as directed in the exercise. However there is one particular 'Production Rate' which still shows "PtCreated". the…

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

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 Acetylene, Ethylene and Methane, which are all linked to a PI tag. The calculation I want to perform is Variable1 = 'Acetylene' + 'Methane'. The error message in the… (Show more)

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bdeslatte (to tommm) 2 months ago (Show more Show less)

I know this is old, but probably better to use TagBad or BadVal rather than IsSet for tag data validation. For instance, IsSet('MyNewAttrTag', "q") would not detect states like Pt Created or IO Timeout.

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

Question...

It's a open question, what would you do? At 2am the server probably be saturated. Probably the third option it's a valid option too.

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jasongogal (to fchanampa) 3 months ago (Show more Show less)

Is the Excel strategy the only way to create the report? Why do the same archive calls 200+ times using Datalink? Could one user run a macro that "saves as" a new copy with static values? Could the result be exposed in PI Vision? Could a summary analysis in AF publish its results on a schedule, with users retrieving the output tag? There are…

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

Level Change Calculation

I am new to using PI and have been working in AF to learn analysis, can someone help me write a calculation for finding the change in tank level over the past hour?

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pbunker (to Jenn) 3 months ago (Show more Show less)

Hi Jennifer, thanks for reaching out! If the tank level is recorded in an attribute called att1, the expression could be similar to: TagVal('att1') - TagVal('att1', '*-1h') This would be (current value) - (value 1 hour ago). I hope this helps. Please let me know if you would like any clarification or if you were looking for something…

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

Calculate a running total of number of hours an equipment is online with exception of 20 Seconds Spikes

Hello, There is a requirement to get a running total of number of hours an equipment is online over a range of time (from Start to end of the year) and this should auto reset at the Start of every year. There is an exception added to the above requirement that the equipment will be considered online only if it is online for more than 20 Seconds… (Show more)

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Sumra (to LalBabuShaik) 3 months ago (Show more Show less)

Hi Lal Babu, This helped. Below are the Steps I performed. 1) Created an Analysis that calculates the total number of Seconds the Equipment was online using the TimeEq function. 2) Created another Analysis with condition that if the current value is offline and previous value is online then it will calculate the time duration in seconds for…

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