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DAQ Assistant
Dejun
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02-17-2005 08:21 PM
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Hello,
I am a beginner of LabVIEW. I am using PCI-6023E to do DAQ. I have a question on DAQmx task.
Method #1:
Start from DAQmx Task Name control and follow the step-by-step prompt, a DAQmx task will be generated, and this local task can be seen on MAX data neighborhood. Then I generate LabVIEW code. Using this method, the DAQ can be successfully implemented.
Method #2:
I directly place the DAQ Assistant Express VI on the block diagram, and use a graph indicator to show the data. This can achieve same purpose as method #1. However, I found no task is generated using method #2, which also can be reflected in MAX data neighborhood.
So, what's the difference between these two method? As I know task is integrated in DAQmx measurement, but why method #2 does not involve a task?
I am a newbie of labview, sorry for my simple question. Thank you very much for your answere.
Derek
I am a beginner of LabVIEW. I am using PCI-6023E to do DAQ. I have a question on DAQmx task.
Method #1:
Start from DAQmx Task Name control and follow the step-by-step prompt, a DAQmx task will be generated, and this local task can be seen on MAX data neighborhood. Then I generate LabVIEW code. Using this method, the DAQ can be successfully implemented.
Method #2:
I directly place the DAQ Assistant Express VI on the block diagram, and use a graph indicator to show the data. This can achieve same purpose as method #1. However, I found no task is generated using method #2, which also can be reflected in MAX data neighborhood.
So, what's the difference between these two method? As I know task is integrated in DAQmx measurement, but why method #2 does not involve a task?
I am a newbie of labview, sorry for my simple question. Thank you very much for your answere.
Derek
LA 75
NI Employee (retired)
02-18-2005 04:21 PM
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Hello Dejun,
That's actually a very good question. The difference between both methods is that with the DAQ Assistant you create what's called a Local Task that and with the DAQmx Task name you create what's called a Global Task. Global Tasks can be seen in MAX, Local Task's can; both will get you to the same result though.
Hope this helps.
Thanks,
LA
That's actually a very good question. The difference between both methods is that with the DAQ Assistant you create what's called a Local Task that and with the DAQmx Task name you create what's called a Global Task. Global Tasks can be seen in MAX, Local Task's can; both will get you to the same result though.
Hope this helps.
Thanks,
LA
LA 75
NI Employee (retired)
02-18-2005 04:23 PM
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[Correction to my last line]
...Global Tasks can be seen in MAX, Local Task's *can't*; both will get you to the same result though.
...Global Tasks can be seen in MAX, Local Task's *can't*; both will get you to the same result though.
02-21-2005 10:05 PM
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Are you sure global is shown but local task not shown in MAX?
Then, why in MAX data neighborhood > Creat New > ..., there are two options: (1) NI-DAQmx task (2) NI-DAQ Global channel ?
Then, why in MAX data neighborhood > Creat New > ..., there are two options: (1) NI-DAQmx task (2) NI-DAQ Global channel ?
LA 75
NI Employee (retired)
02-22-2005 12:43 AM
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Hello Dejun,
That's correct...in MAX we have DAQmx Tasks and Global Channels. When you create a Task in MAX, you will create a local channel as well. When you create a global channel, you can add them into a Task. Local Channels are local to the Task, but global channels can be added to any task of the same type that you create.
Before we were talking about global/local Tasks...
For more information about this, I would encourage you to read the following KB:
http://ae.natinst.com/operations/ae/public.nsf/web/searchinternal/def7c64ffe5a525586256cc700762e4a?OpenDocument
Please let me know if you have any additional questions.
thanks,
LA
That's correct...in MAX we have DAQmx Tasks and Global Channels. When you create a Task in MAX, you will create a local channel as well. When you create a global channel, you can add them into a Task. Local Channels are local to the Task, but global channels can be added to any task of the same type that you create.
Before we were talking about global/local Tasks...
For more information about this, I would encourage you to read the following KB:
http://ae.natinst.com/operations/ae/public.nsf/web/searchinternal/def7c64ffe5a525586256cc700762e4a?OpenDocument
Please let me know if you have any additional questions.
thanks,
LA
