Configuring DAQ channels through LabView program

Hi,
I want to scan one analog input of PCI 6025E every 250 msec and I scan 8 such channels. I am using AI Sample Channel VI to do this and for its channel input I am feeding a string (with channel name) that is typecasted using a Traditional DAQ channel constant. All the required channels are configured using this constant. However this VI doesn't seem to be portable. When I use it on a different machine, the constant shows no channels defined.
Is there a way to configure DAQ channels through my program such as to make the program portable? I came across notes that mentioned DAQ global channel but I don't know how to use it.
Thank you in advance,
Sharmila

One of the great things about DAQmx is that there are only 4 basic VI's to learn to use. The Configure, Read, Write and Stop. The same Configure VI that was used to setup the analog input channels can be used to setup analog output, digital in/out and counter in/out.
The small menu on the bottom of the VI is actually a listing of all the different operations that this single polymorphic VI can do. Click on the down arrow and you'll see what I mean.
I've modified the example to read DIO lines 0-3 and write to lines 4-7 on Port 0. Again it programatically builds the channel list so it will always refer to the correct device. To create individual channels for a digital line, you first specify the device, then the port, then the line or lines. Example, to create a task for lines 4-7 on port 0, you would use "Dev1/port0/line4:7".
Notice that the "DAQmx Create Channel.vi" is the same one used in the analog input configuration, but with different polymorphic selections. Also note the "DAQmx Read.vi" is the same except for the selector.
Ed
Ed Dickens - Certified LabVIEW Architect - DISTek Integration, Inc. - NI Certified Alliance Partner
Using the Abort button to stop your VI is like using a tree to stop your car. It works, but there may be consequences.
Attachments:
Build Task and Scan Channels with DIO.vi ‏127 KB

Similar Messages

Help, Ni-Daq channel names and labview program error 10001?

Can anyone please help me, I have inherited a role that I know nothing about. I have managed to get an NT pc to now recognise the SC-2345 board, set up and configure two channels and test them in Measurement and Automation program, this I managed after getting error 10401 and looking within these message boards which are very good.
I have then started a labview program, previously written by ex-employee, and now get error 10001, after trawling the FAQ and forums I think that I have a naming error in the virtual channels created, how do I find out what the channels should be named within the Labview program, do I need to load an editor etc and then open a config file?
Sorry if this seams like a simple error, but I am trying to learn the software from a book that is a little tattered.
Regards

Hi,
error 10001 can be caused by a few things including an incorrect scanning order.
If you'd like to post your code back onto here (or if it's large, ftp it to ftp.ni.com/incoming and let use know the name of the zip file you've packaged it into), then we can see what the DAQ section is supposed to be doing and hopefully provide some clues as to where to look for the information / why the error is occuring.
The first thing to do is go back to Measurement and Automation explorer and try setting up a global task that refers to the channels you're interested in.
This removes the programming side of things, since you select from drop down lists, to verify that you can communicate correctly with the hardware at the rates and across the channels that you want.
These links is going to be your best learning point for getting up an running with the program.
http://digital.ni.com/public.nsf/allkb/DD52ABD7C15F0B15862562910074F09E
http://zone.ni.com/devzone/cda/tut/p/id/3116
http://zone.ni.com/devzone/cda/tut/p/id/4656
In terms of LabVIEW, there's several I/O controls you can use which will list the hardware channels you have configured or the global tasks you have created in Measurement and Automation explorer. (see the last link above)
Another option is to look at our Alliance Partners if you need things configured and up and running in a hurry.
http://www.ni.com/alliance
If you just need a little pointer on getting kicked off, then you could see if you local sales engineer is available to go through things with you for an hour if they're in your area at a convenient time (for the UK / Ireland, please call in on 01635 572410 and ask to go through to sales), or we do offer start-up assistance (but that's something you need to purchase) to get a day's onsite assistance with getting your hardware up and running and starting you off with advice / examples on your application (note this is an effort based thing rather than a results based guarantee)
Finally you could consider coming on one of our courses on LabVIEW and / or Data Acquisition to learn more about the software / hardware and be better prepared to handle the implementation yourself.
Hope that helps
Sacha Emery
National Instruments (UK)
Message Edited by SachaE on 03-23-2007 11:49 AM
// it takes almost no time to rate an answer

Labview DAQ channel viewer doesn´t view to much

Hi, heeelp please
I´m starting to bealive in goblins.
I have a Pci-6013, and did a university proyect using also NiDAQ 6.9.3 and Labview 6.1 eval. I tried mi code in a modern amd 2600 pc and worked fine.
Then i installed it in a Shuttle SKG1, for the cybernetic fountain (my proyect, a photo is attached, working, with the old good new computer, by the Shuttle, almost not to be seen) to be more nice. But i couldn´t get it to work, since the simple Write to digital line.vi wouldn´t get to work; LabView doesn´t read the channels i had previously configurated in the MAX explorer. When i go to tools, Data Acquisition, Daq Channel Viewer i get to see other channels i didnt configurate, like sine, or temperature.
In the Amd 2600 normal computer the problem doesn´t arise, when i go to the Channel Viewer i get to see my channels. Well, i´m in troube, since i need it to work eather in the Shuttle or in an old Pentium II, in which the same probem arises. What do have a Shuttel and a Pentium II old computer (eaven with Isa slots, besides the Pci slots) in common against a normal Amd 2600 in an Asus board in common for it to do such a thing.
Any hinch on the topic would be by this time very much apreciated.
Attachments:
IM000238.JPG ‏850 KB

It is not really clear where you see what in MAX.
If you have developed and tested your program and configured the channels on the AMD PC you have to do the following:
Open MAX, select File>>Export and go through the wizard to export the NI-DAQ configuration. You will get a file. Copy this file to the target machine. There open MAX and select File>>Import. Select the file you have copied. Then you should see your channels in MAX and your application should work.
Waldemar
Waldemar
Using 7.1.1, 8.5.1, 8.6.1, 2009 on XP and RT
Don't forget to give Kudos to good answers and/or questions

How to arm channel 1 of a PCI 6133 DAQ card using labview?

Hi,
I am new to the Labview and I need some help. I have a PCI 6133 multifunction DAQ card and I'm using Labview 8.2 to capture five channels waveform data. I setup channel ai0 to be the trigger channel and I need to capture data from ai0, ai1, ai2, ai3, and ai4 when ai0 is trigger.
Question:
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Thanks

Hello wirte spreedsheet,
Thanks for posting to Discussion Forum. It looks like you are using the
PCI-6133 to acquire analog data from ai0:ai4. You want to use ai0 as
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Does your application need to be retriggerable?
Are you doing continuous acquisition?
Are you doing Analog start trigger or reference trigger?
Take a look the following shipping examples, found in LabVIEW click
Help>>Find Examples. On the browse tab, Hardware Input and
Output>>DAQmx>>Analog Measurements>>Voltage:
Cont Acq&Graph Voltage - Analog SW Trigger.vi
>> This example demonstrates how to perform an analog software
triggered acquisition. The example allows the user to specify the
triggering condition and the number of pre-trigger samples to acquire.
Cont Acq&Graph Voltage - Int Clk - Analog Start.vi
>> This example demonstrates how to continuously acquire data
(Waveform) using the DAQ device's internal clock and an analog slope
start trigger.
Take a look at these applications and let me know if you have any questions or comments.
Have a good day.
Regards,
Sandra T.
Applications Engineer | National Instruments

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Hello,
I am a LabView beginner.
I would like to know if it is possible to develop & to test a LabView
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Modification of Global channels In NIMax while Labview Program running, not updating in Labview

Hello,
Okay, here is my issue. I have a program that reads data from a device using global channels in MAX.
Step 1: I open MAX with the systemExecute.vi with the parameters to wait till program finishes.
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I am really very new to Labview and i am in great need for some help.I am assigned a task where i am supposed to create a labview program to control or moniter a BPC203 3 channel benchtop Piezo controller. I created a program with the help of the instructions provided in the APT-Labview guide provided by Thorlabs.But th program doesnt run . Whenever i try to run it i get the same error which says that "Control HW Communications disabled".I have attached a snapshot of the error message.So i tried to create a small program in labview which would read the volage output.Even there i got the same error message.I suppose there is some mistake on my part which i am not able to correct due to the lack of proper knowledge.Could anyone please help me to solve this problem.A slight elaboration would be highly appreciated.Also i think the error lies in the use of invoke node with the get Voltage output method. I am not sure whether the parameters i have provided to the invoke node are correct.Any help of any sort would be highly appreciated.
Attachments:
Front Panel with error message.PNG ‏202 KB
Block diagram.PNG ‏101 KB

Hi
I had the same problem today. However, I noticed that the piezo controller has 3 channels with separate slots and they are packaged in the same box. Therefore the whole box has a serial number, probably something like 71822280, and this is written with large letter. Now, in order to communicate with any of the channels, this does not help, but one needs to communicate directly with the interested channel and they have thier OWN SERIAL NUMBERS.
For example channel 1 (my X direction in the nanoMax stage) has serial 91822281, Y has 91822282 and Z has 91822283. So try looking if you have the right serial number Hopefully you found out this yourself but this might help others, I took me3 hours to get this thing working when I started to plug-in the cables and everything.
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LabView (8.2) hangs when using I/O operations with traditional NI-DAQ 7.4.4 after aborting LabView program

Hello!
We have the following problem:
LabView (8.2) hangs when using I/O operations with traditional NI-DAQ 7.4.4 after aborting LabView program
We freshly installed LabView 8.2 (2006) and NI-DAQ 7.4.4 on a PC running Windows XP (Service Pack 3). We built a larger vi that remotely controls a traditional NI-DAQ card (AT-AO-10) on a second PC via NI-VISA 5.0.3. We were successfully running this program until a power failure caused the first computer to crash. After this crash we were unable to start the program again: LabView freezes while loading the vi. LabView itself can be started but freezes when adding I/O operations from the NI-DAQ palette to a block diagram.
We have tried to re-install NI-DAQ 7.4.4, but it did not help. We then re-installed all NI software, but still no improvement. In the end we decided to reinstall ALL software, first Windows XP, then LabView and finally NI-DAQ 7.4.4. This worked. However, after a few days of running the program we had to abort LabView via Windows Task manager and afterward we again experienced the same problem as before: LabView freezes when loading the program.
Obviously, we cannot afford to reinstall Windows every time. Are there any known Windows XP / NI-DAQ issues that might cause the freezing of LabView? We would be very grateful for any idea.
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Matthias

Hello Sprice,
Browse the shipping examples according to “Directory Structure” and then select
DAQ to find the Traditional DAQ examples.
There a lot of examples that are written for counters (Counter >>
daq-stc.llb >> Count Edges (DAQ-STC).vi).
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Respectfully,
Rob F
Test Engineer
Condition Measurements
National Instruments

Once running the labview program which contain DAQ Assistant ,the message of "ERROR-50405....." appear.

Once running the labview program which contain DAQ Assistant and can be run without any error before, the message box of "ERROR-50405....." appear which capture down in the attachment. We use PCI6221 and LabVIEW 8.0 in Windows XP. I also found that the Device Manager of Window have recognized the PCI6221.
Any help on this situation would be great.
Attachments:
labview error.JPG ‏145 KB

Hi~
This error is due to signal interference between the device and the computer. This could be environmental or due to the PCI Controller. You can on a different computer to see whether this problem persists.

Configuring executable labview programs originally configured with a PCI-MIO-16XE-10 on a system with a PCI-MIO-16XE-50 card

I'm hoping someone can help me. I have executable labview programs created in another lab which used a PCI-MIO-16XE-10 card. I need to install these programs in a new lab which has a PCI-MIO-16XE-50 card installed. When downloading the executable files, Measurement and Automation Explorer gave a message that the physical devices could not be located. I presume this is because the executables are configured for the PCI-MIO-16XE-10 but the PCI-MIO-16XE-50 is installed instead. Any suggestions on how to get these programs configured with the PCI-MIO-16XE-50 would be greatly appreciated? Thanks.

As long as you have the device identifier of the PCI-MIO-16XE-50 set the same as the PCI-MIO-16XE-10 for which the program was written, you shouldn't have a problem doing what you describe.
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Configuring DAQ channels through LabView program

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