struggling how to set up 2 daq assist on labview in the same VI

hi all,
hope someone can help me out
I am currently using the scxi 2345 with some SCC FT01 feed through modules, these are just to record some voltages from some transducers.
What I am struggling with is setting up 2 daq assist on a single VI, it is coming back with a error stating specified resouce is reserved and then a window saying learn more about automatic handling. How would I also have these 2 values logged on the same graph or chart?
Anyone any ideas how to set these up.
I ideally want to have 3 daq assist in the same Vi but not sure if this is possible. It would be 1 for thermocouple input and 2 for voltage as stated above
many thanks
shane dover
x9561 (148438)
2/21/2006 10:10:51 AM
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The way it's usually done is to have a single DAQ Assistant that reads all channels. If, for some reason, you insist on 3 separate DAQ tasks, they would have to run sequentially. You do that by wiring the error in/error out connections together so that one task finishes befor the next one starts.
You can use the Split Signals function on the output of the DAQ Assistant (assuming you have a single DAQ Assistant) to get the separate channels, and then the Merge Signals on the two that want and wire the output of that to your graph/chart.
x9561 (148438)
2/21/2006 3:40:32 PM
Hi Shane and Dennis, 

I've been working my way around the same type of problems, and I am
currently re-writing everything to use on Asst. per board on my PXI
chassis, so that no resources become reserved. 

As a result, I have to separate the signals on the output dynamic data
in order to do different post processing.  So I have been toying
with staying with dynamic data, inputting dyn. data into an array, and
inputing it into a cluster.  It seems that each has advantages and
drawbacks, but arrays seem to be the easiest with which to work when
splitting signals coming from a DAQmx Asst. and funneling some of the
signals into a post-processing sub-VI.  The drawback to this is
that time stamps in the Dyn. Data are lost if you want to record the
data and the time of the reading.  

Question:  Is there an easy way to pipe Dynamic Data into a
calculation subVI?  Is it workable after it's been split from
other streams?  

x9561 (148438)
2/21/2006 3:40:36 PM
Actually, unless I buggered it somehow other, this To/From Dynamic Data
function was the first that I tried.  The problem may occur in
splitting the signals, something that is mandatory if you only use one
assistant per board with several different tasks going through
it.  Once I had converted from dynamic data to any of the choices,
split the signals, and piped into a sub-VI, I lost some of the
information that had originally been with the dynamic data.  I
guess the question should be, "Is there an easy way to split signals
coming from dynamic data of one assistant and maintain the time stamp?" 

x9561 (148438)
2/22/2006 2:10:41 PM
Are you wiring the data to a waveform graph? If so right click on the graph and uncheck the 'ignore time stamp' option?
If this isn't what you are seeing, what do you mean the data is lost? Can you post some code which demonstrates this problem
NIUK & Ireland
x9561 (148438)
2/23/2006 4:40:40 PM
I am plotting to a waveform chart.  Neither the chart nor the
graph give the option of ignoring a time stamp when I right
click.  I have posted the sub-VI that does the graphing.  It
is set up to take in the clustered data, after it was converted from
dynamic data in the main VI that calls this sub-VI. 

Thanks for the input,


Graph Window from 2 Clusters.vi:
http://forums.ni.com/attachments/ni/170/169567/1/Graph Window from 2 Clusters.vi
x9561 (148438)
2/23/2006 10:40:40 PM
Hey Brad
Can you post the vi that this subvi is used in so I can see how and why you are formatting the data in this way.
The data you pass into the subvi is a cluster with just doubles in, your not passing any timestamp data into the subvi so you wont be able to plot this to your chart.
If you post the other vi, I'll look at how to get the timestamp data too!
x9561 (148438)
2/24/2006 9:10:39 AM

Here is the main VI.  There are two other sub-VI's, but they are
just post processing the voltage signals into pressure readings on two
different types of sensors.  The fact that they involve different
types of post-processing and are on the same board is likely the source
of the problem, so if you could think of a creative way to work around
it, that would be great.

x9561 (148438)
2/24/2006 2:10:32 PM
Hello Brad.
Looking at your vi, the reason why you dont have any timestamp data in your charts is because your 'convert from ddt' function is converting the dynamic data into an array of scalar values. This will remove the timestamp and just take the actual Y values (values read). If you want to use the timestamp data then you'll need to specify '1D array to waveform'.
Then you'll be able to index each individual set of data so that you can manipulate the data for each channel, including the timestamp.
I've attached an example that reads from 4 Analog Input channels on Dev1 using the DAQ assistant, then the data is plotted together as dynamic data, also the data is passed through an 'index array' function to allow you to plot each channel individually. 
Please note that on each graph, I have right clicked an unchecked the 'Ignore Timestamp' option, so that the time data is displayed correctly.
I hope this helps

plot to graph.vi:
http://forums.ni.com/attachments/ni/170/170136/1/plot to graph.vi
x9561 (148438)
2/27/2006 3:10:45 PM
Thanks Hannah.  It seemed like an easy fix, but upon changing my
DDT conversion VI to convert to waveform data I still didn't get the
time stamp.  I probed my wires and found that I had the time stamp
after conversion, but not into my post-processing sub-VI.  It is
interesting to me because my sub-VI is so simple - it merely accepts an
input array, calculates pressure from voltage, and outputs an
array.  The time stamp doesn't even make it into the sub-VI, so it
can't be the calculation where I am losing the data.  Is there
something I am missing about adding a subVI?  Do I have to
explicitly tell it to hold the time stamp? 

Here is the sub-VI...


Calculate Ion Gauge Pressure.vi:
http://forums.ni.com/attachments/ni/170/170984/1/Calculate Ion Gauge Pressure.vi
x9561 (148438)
3/2/2006 2:10:38 PM
Hannah and company, 

I have been chipping away at this problem, and I have made some
progress.  The time stamp of the dynamic data was lost in both
data streams at each of two sub-VI's I had written.  One was very
simple, so I simply pasted its "guts" into my main VI, selected it
again, and use the "make SubVI" function under edit.  Now the time
stamp is passed through this subVI.  The other subVI is much more
complicated and pasting it into the main VI is not working (I'm not
sure I understand why).  I still have no time stamp coming through
this one.

Two things - 1) I am interested on ideas on why the time stamp won't
pass through the complicated post-processing subVI (I've attached
it).  2)  I am interested to know, for future reference, why
the creation of a subVI using NI's menu option rather than creating the
subVI from scratch was sufficient to preserve the timestamp data. 

As this post has deviated considerably from the original title of the
thread (which was not even mine), I am going to cross post this


Calc Convectron Pressure.vi:
http://forums.ni.com/attachments/ni/170/171372/1/Calc Convectron Pressure.vi
x9561 (148438)
3/3/2006 9:10:46 PM
Thanks for the input Hannah.  I recieved some good suggestions on
my cross posting
and i now have my time stamp coming through.  As per your
suggestion, I am still confused as how to create an array of waveform
data from thin air.  What I ended up doing was copying one from a
subVI that LabVIEW had created for me.  

x9561 (148438)
3/6/2006 2:11:00 PM
Hi Brad,
I'm not sure what you mean by 'how to create an array of waveform data from thin air' but I think you mean so that you have a constant or a control you can work from or build them from other parts of data (from wires) in your program.
If thats the case, then firstly, you can take a waveform control and put it on your front panel. This can be found on the I/O palette. If you want a waveform constant instead, the easiest way to do this is to create a control and then right click it to change it to a constant. 
If you want to create a waveform from data that you have in wires, i.e on the fly, then you can use the 'build waveform' function. Which you can find on the 'Waveform' palette. This function takes in the following data

<a name="Input3" target="_blank"></a><img src="mk:@MSITStore:C:\Program%20Files\National%20Instruments\LabVIEW%208.0\help\lvwave.chm::/catrn.gif"> 
t0 is the start time of the waveform. 

<a name="Input4" target="_blank"></a><img src="mk:@MSITStore:C:\Program%20Files\National%20Instruments\LabVIEW%208.0\help\lvwave.chm::/cdbl.gif"> 
dt is the time interval between data points in the waveform. 

<a name="Input5" target="_blank"></a><img src="mk:@MSITStore:C:\Program%20Files\National%20Instruments\LabVIEW%208.0\help\lvwave.chm::/c1ddbl.gif"> 
Y  contains the data values of a waveform. 
and gives out a waveform type of data.
I hope this helps. Let me know if you have some more questions.
x9561 (148438)
3/6/2006 2:40:50 PM

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I have been working with Labview 6.1 but I need to execute my VIs in Labview 5.1 too. What can I do to reuse all the VIs without having to develop them again in Labview 5.1? I am not able to save my VIs as 5.1 from Labview 6.1 It only allows me to save them as Labview 6.0 Thank you! Assuming they can be converted, and there's not too many, you might want to try posting them here for someone to convert. (convert to 6.0 first and zip) Not too elegant but may get you out of a bind. Hello, Yes, each new version of LabVIEW only carries the capability to save for one version previous. So, you would need to save the 6.1 VIs for vesion 6.0, and then from LabVIEW 6.0 save for 5.1. If there aren't too many VIs, one of our engineers here would most likely have no problem with making the conversion for you. You could email NI with them to make it more private, if you'd like, rather than posting them on the site. (To create an email request, go to www.ni.com/ask). Hope this helps! Liz Fausak National Instruments ...

Missing DAQ Assistant in LabView 8.0
Hello, &nbsp; In LabView 7.1 I have the DAQ Assistant under the "Inputs" folder, but in ver 8.0 it is missing. However I do have some DAQ functions in the "Measurement I/O" folder, but not the DAQ Assistant. I have installed the PCI 6601 that I want to use as position controller and general I/O &nbsp; any suggestions? &nbsp; thanks, gert &nbsp; Abhinav, &nbsp; I reinstalled the drivers that came with the PCI 6601, and everything works fine.&nbsp; It seems that Labview 8 has to be installed before the drivers. &nbsp; thanks for your help &nbsp; gert &nbsp; ...

LabVIEW 8.2 -- "unable to locate LabView run-time" error message
I am trying to run a LabVIEW version 8 exe file and keep getting the "Unable to locate" error. I downloaded LabVIEW_8.2_Runtime_Engine.exe from the NI website and installed the entire contents of the distribution. After getting the error, I have tried uninstalling and reinstalling several times, with the same result. Is there some way I can troubleshoot this? Is there a configuration file or a registry entry I can check to see where LabVIEW is looking for the run-time? ...

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