How can I get the screen of my laptop to update more often as the data changes to slowly

[kloke]

The system that I am using t I read voltages is working well but the screen of my lap top is up dating to slowly and ad such do not see all the changes the up date seams to take +- 20 seconds and this is to long

[Sean_C.]

Hello kloke,

Thank you for contacting National Instruments.

Are you using LabVIEW to run this application? If so, check the wait time inside the FP Read while loop. You should see a new value read for each iteration of the while loop.

Please reply back with more information about your application and hardware.

Sincerely,

Sean C.
Applications Engineer
National Instruments

[kloke]

Hi Sean C
I am running labvue 7.7 on a laptop the os is xp the hasewar is mi FP1000 coupeld to 2 fp1001 with a FP CTR 500 and an FP AI 110 connected to Each the connection between the FP 1000 and the FP1001 is by firer optic using ADAM 4541 converters. I an using this set up to monoter the voltages and current in an 3.3KV electric locomotive to record the3 readings to a spred sheet and display the readings on the laptop screen atthe same time so thet we can see if there are eany faults as we do the tests on the loco. hope this helps and if the files will help i can send then to you
regards louis kloke

[Sean_C.]

Hello kloke,

Do you see the same behavior when you try to read from the FP-1000 by itself? It may be that your communication between the FP-1000 and FP-1001 is slowing down your application.

If you can post your VIs, I would be glad to take a look...

Sincerely,

Sean C.
Applications Engineer
National Instruments

[kloke]

Hi sean.
Hear withmy vi and yeas i have tries it without the Fp-1001 i do not notice the difference

[Salvador_Santolucito]

Hi kloke,

In the loop in your VI, you have 12 FP_Reads and a write to spreadsheed function (which opens, writes and closes the file). It is not uncommon for such a Vi to execute slowly considering the overhead assosciated with each fieldpoint read. It may be helpful for you to combine all of your analog input channels into a single read and all of your counter channels into a single read. This will reduce the number of FP_Reads that need to be called. I have attatched a picture of what I'm talking about.

-Sal

[GValdes]

Hi, Kloke,

Another thing that you should try changing is the way File I/O is done in your loop. As Salvador stated, the Write to Spreadsheet File VI opens, writes and closes the file every single time it is called. This definitively adds some overhead to your application, which at the end can be translated into more time for each iteration to execute. I will recommend you follow a different architecture, in which you first Open the file outside the loop, Write inside the loop, and Close the file once you press the stop button. I am attaching a picture of a simplified version of the block diagram. You should see a difference in performance after implementing an architecture like this.

I hope this helps!

GValdes

[GValdes]

Sorry, I forgot to attach the picture.

GValdes