Statistics history size

Hi everyone.

I am working on a model of a surgical tool sterilization plant, and need a suggestion on how to solve a problem.

The model runs over the course of a year, and I am using a Tracked Variable Histogram to monitor the time passed from the end of surgery to the beginning of the wash cycle. Every time a washing rack enters one of the washing machines, I add an entry to a Tracked Variable for each of the instruments contained in the rack. This leaves me with roughly 5-10 million entries over a year. That is a lot of data, and it makes it hard for me to use the dashboard to spot irregularities.

What I would like to do is to limit the Tracked Variable to tracking only the latest 5000 entries. Is there a way of doing this? Or is a Tracked Variable the wrong way of going about this?

Screenshots attached.

Any input is appreciated.

Best regards
Christian

Hello Christian,

you are looking for the same method used in the statistics of a queue with the parameter "content history size"?

Jörg

Hi Jörg.

Yes, I suppose that is what I am looking for. Is there any way of applying that to a Tracked Variable?

/Christian

Hello Christian,

tracked variables are of the datatype bundle.
You can easily remove the first and the last entry from the bundle-array by commands.

removefirstbundleentry(Node of the tracked variable)

If you want to limit the bundle size, my first approach would be to remove the first bundle entries until the 5000 entries are restored.
Any trigger or a repeated user event is a place to write such a code.

Jörg

Excellent, I will give it a try.

Thanks, Jörg.

I have now tested this through, and it works like a charm. I never had a look at bundle data before, but I will spend the rest of the day today studying this area.

Thanks again!