Calendar and the problems of data collection with the DAQ Assistant

Hello NOR Developer area,

I am a Novice of LabVIEW and have seen how helpful you all can be, and if I come to ask for your help.

I'm having some trouble with a VI I built that specifies an input voltage, a SCB - 100 connected to a PCI-6031E and converts this tension in a temperature displayed on a waveform table. The goal is to give a constant reading of the temperature and display it in a chart for as long that the VI is running (and to reset the chart the next time the tracks of VI).

The problems I've encountered currently are:

-After a few minutes of the VI running, I get an error message 200279: tried to read samples that are no longer available. The requested sample was already available, but has since been replaced. (to the DAQ Assistant express VI).

-I don't know how to change my chart so that the minimum value X is both during which the VI was launched and have the maximum X value increases with each iteration of the loop. Currently, I have the VI get the time system and contributing to the property node X scale. This worked for the graph of the voltage, but not for the temperature chart

I appreciate those of you who took the time to read my post.

Thank you all for your help.

Sincerely,

Ethan A. Klein

SB candidate in Chemistry & Physics

Massachusetts Institute of Technology

Class of 2015

PS I enclose my VI to give you a better understanding of my current situation.

E A Klein wrote:

Thanks for writing.

What property node is talking?
I do not understand that many different data types. How can I go on the treatment of all the data?

(Did you mean I should wire 'blue' data for mathematical functions rather than using the node property tension?)

Sincerely,

In fact, one of the nodes property.  I mean specifically the tension property node.  But in reviewing, I noticed the other nodes in property for the chart.  Just set auto-scaling to the X scale and that should take care of two of the nodes property (right click on the graph, X scale-> AutoScale X Scale).  I also recommend placing your mathematical functions in a Subvi to make things easier to read.  Attached, that's what I think you're after.

I hope that these small tweaks will speed things up enough to avoid your error.  If this isn't the case, then we should begin to look at the design of producer/consumer model or take readings at the same time.  It might also be worth looking away the DAQ Assistant and DAQmx real screws.  But one step at a time.

Tags: NI Software

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