maximum value

[Zac_Acal]

Hi Guys,

             am reading numerical data from a PLC, via datasocket. The data is displayed in real time on a front pannel indiactor and historically on afront pannel chart.

I want to display the max, min and mean of the realtime data on the front pannel, i apriciate that to do this i need to store the data as i go (perhaps in an array?)

I can't use shift registers as the whole program resides in a loop and i dont want to have a loop within a loop.

So how can i build up samples and display the max, min, mean of this data ?

cheers, Zac

[Coq_Rouge · Accepted solution]

If you have your data in a waveform chart, you can use the History Data Property. This will give you accses to the data in the chart. Se picture

[MikeS81]

Hi Zac,

if you already have a loop, then you also can use shiftregisters. How long is the history of your chart. You can use the chart history to calcualte min, max and mean, but i think you should check which solution is faster.

Hope it helps.

Mike

[Andrey_Dmitriev]

Hi, Zac,

Probably you can use MeanPtByPt.vi?

(located in Signal Processing->Point by Point -> Probability  Statistics PtByPt -> Mean PtByPt.vi)?

With this VI you will be able to calculate Mean within given Window without extra for loop. Actually this VI organized as functional global, so you can build you own VIs for Min/Max by the same way.

Andrey.

[Zac_Acal]

Thanks for the help,

i've gone with the first soloution as being able to show the max, min, mean of the actual chart data is perfect for my application.

Thanks, Zac