One card triggering multiple 6071E simultaneous data acquisition

I have 6 6071E boards in a PXI chasis and am trying to simulatneous trigger data acquisition on all the channels of all the boards. The trigger event is one channel on only one board. Using NI application note 129 I was able to get one slave and one master board to trigger, but could not expand it to a third board.
Thanks,

Hello;
I'm attaching a labview example showing how to accomplish that task with a arbitrary number of boards on the PXI chassis.
Hope this helps.
Filipe
Applications Engineer
National Instruments
Attachments:
pxi_mio_speed_test.zip ‏58 KB

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Triggering a 6024E into data acquisition from start and end number of finite pulse generator from a 6602

My motion control system is driven by a 6602 I wanted to acquire analog current (to a voltage via I/V converter) from a 6024 AI when:
(1) At the start of the pulse generation
(2) Stop at the end of the pulse generation
(3) Read every possible data between and stream it on the harddisk
(4) Option to skip at regular intervals to reduce amount of data accumulation
Anyone have some suggestions? What I did try and attempted was to "loop an AI from a triggered intermediate Analog Input VIs" this is rather erratic!My question for the analog input software are:
(1)Can you trigger an AI to start a continuous acquisition?
(2) How do you do AI from a "start" p
ulse train to "end" pulse train?
(3) How do you manage time for File I/O meanwhile doing (1) and (2) above?
Bernardino Jerez Buenaobra
Senior Test and Systems Development Engineer
Test and Systems Development Group
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"(1)Can you trigger an AI to start a continuous acquisition?
(2) How do you do AI from a "start" pulse train to "end" pulse train?
(3) How do you manage time for File I/O meanwhile doing (1) and (2) above?"
Answer 1 and 2)
Yes you can, This VI is part of the search examples that ships with LV:
"Continuous Acquisition & Graph Using Digital Triggering and External Scan Clock
Demonstrates how to continuously retrieve data from one or more analog input channels using an external scan clock when a digital start trigger occurs."
Go to Search Examples in the Help/Contents of LV. Then pick I/O Interfaces/Data Acquisition (DAQ)/Analog Input/Triggering an Acquisition/Triggering a Continuous Acquistion.
This VI is appropriate ifs you want to clock the DAQ with some clock (external scan clock) other than the on board clock.
The start trigger required by the DAQ card will be a TTL signal attached to the PFI0/TRIG1 pin of you DAQ card (via whatever signal conditioning you have).
The external clock also needs to be TTL and is attached to the PFI7/STARTSCAN pin.
You tell it which AI channel to use and wire that up appropriately.
All of this stuff is in the context help for the VI.
Answer 3)
You have a misconception of how the acquisition makes its way into a file on the hard disk. You don't really "stream to disk." The VI above will run a buffered acquisition. The DAQ card sets up a buffer that fills with the data continously. When you use the VI you set up how the buffer is configured, you will see controls for buffer size, number of scans to read at a time, etc. The acquisition runs data into the buffer continously and reads from the buffer are a parallel process where chuncks of the buffer are extracted serially. You can end up with a scan backlog where the reads are falling behind the data. Making the buffer bigger helps. All of this is limited by the sampling capability of the DAQ card. 200kSamples/second is for one channel of AI. Divide by 2 for 2 channels. etc.
The short answer is that the VI and DAQ card manage the file I/O for you.
The VI above writes the scan out to the waveform chart on the front panel. You will want to wire that data out from the AI Read Sub VI to a spreadsheet file in tab delimited form or similar.
Look inside the VI block diagram. There is a While loop containing the AI Read. Every time the loop runs (unless you hit STOP), the AI Read plucks the specified # of scans from the buffer (starting from the last unread datum). If you wire the double orange wire from AI Read out of the loop (and set the tunnel for Auto Indexing) the Vi will build another buffer in memory that is a series of AI Reads appended to each other, a sequencial record of the acquisition. Here you put in a Write to Spreadsheet VI. This is in the Functions Pallete, it is the first VI in the File I/O Pallette (icon looks like a 3 1/2 disckette).
There is more to it than this. The spreadsheet Write is 1D or 2D only. By running the array out of the while loop with auto indexing enabled, you create a 3D array. (If you turn off auto indexing you will only get the last array performed by the AI Read.) You will need to create a new array withe the pages of the array placed serially into a 2d array. I don't think I want to get into that. It isn't that bad to do, but you should get some time messing with arrays on your own, then you will see how to do it yourself. One solution is to only run the While loop once with a buffer big enough to hold the whole acquisition, or in other words no loop at all. I don't know how many scans you want. The other thing is by wiring that AI Read out of the loop you are creating an array that must be dynamically resized as the loop runs. Kind of a no no. Better to know what you are acquiring size wise and letting the VI set up buffers and array space that does not need to be changed as the program runs.
Caveat: I am fairly new to this and I could be wrong about the arrays and buffers and system resources stuff. However, I have done essentially what you are trying to do succesfully, but not "continuously." I limited the AI Read to one large read that gets what I need.
"Continously" is usually reserved for screen writes as in the VI above. The computer is not required to continually allocate space for an ever expanding array to be written as a file later. Each time this VI runs the While Loop the data goes to the waveforn chart. Each new AI read overwrites the previous one. Sort of like if you turn the Auto Indexing off. When the VI stops, the waveform chart on screen would show the same data as was written to the spreadsheet.
Feel free to email me directly: [email protected]. I will help as I can.
Mike Ross

Using of one transaction by multiple users simultaneously

Dear Cons
We have one P.O number. we want to do Migo with reference to that P.o by three users simultaneously. During simultaneously use by multiple users the system gives a message that this p.o is currently used by other user, how can we solve this problem.
example- the p.o contains 50000 mt material ( coal). The material is carried out by trucks into the gate. the users are using T-code- MIGO truckwise. in order to speed up the process as there are lot of trucks carrying material by multiple users the system is not processing data under one p.o.
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Hi,
Alternative you can think of is not to do GR against PO directly, but first create inbound delivery for each of the physical shipments/trucks.
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Not concerning my primary question, I would like to point out to an N.I. Rep. that there is a typo in the help section concerning "posting a message".
I have built a large format, two axis digitizer using linear encoders, a 6601 counter/timer, and labview 8. In building my application program, I initially am using two daq assistants, with each set up to accomplish the task of reading two encoders (2 channels) simultaneously. In doing some research, It has come to my attention, that with my current configuration, errors may result, due to one daq assistant attempting to access the cards driver while the other is acquiring data. All attempts to get two channels working through a single daq assistant have resulted in an error message informing me that I can only have one task per counter.Thus far, I have not seen any noticeable errors, thought I would like to have this device "rock solid", as it will be used extensively.
How can I get two channels working through one daq assistant?
Is it possible, that I should have purchased an "S" series board instead?
Any help on this, is welcome!

If you are using different counter channels for each assistant task, then you should not receive any errors. It's not possible to get two counters working through the same assistant task. This restriction would also apply to S Series boards as well, so you should be fine with your application.
Please post again if you have any problems with this.
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I am trying to fetch analogue waveforms from an AG6000A scope with the respective drivers. I can do it on one channel, it works perfectly.
I want to extend it to 4 channel though, so that the LV reads all the 4 channels simultaneously. The reading is now done by 4 "ag6000a read single waveform" VIs but if I run the system, only the 3. channel acquires data.
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Why don't you look at the example called Agilent Series 600 Acquire Multiple Waveforms? It acquires from two channels and can be easily changed to read from four.

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Hi,
I need to split single row into multple based on date range defined in a column, start_dt and end_dt
I have a data
ID      From date             End_dt                measure
1        2013-12-01         2013-12-03            1
1        2013-12-04         2013-12-06            2
2        2013-12-01         2013-12-02            11
3        2013-12-03         2013-12-04          22
I required output as
ID      Date                      measure
1        2013-12-01              1
1        2013-12-02              1
1        2013-12-03              1
1        2013-12-04              2
1        2013-12-05              2
1        2013-12-06              2
2        2013-12-01             11
2        2013-12-02             11
3        2013-12-03             22
3        2013-12-04            22
Please provide me sq, query for the same
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Please mark as answer if helpful
http://fascinatingsql.wordpress.com/

Have a calendar table for example and then probably using UNION ALL from date and stat date JOIN the Calendar table
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SELECT ID,End_dt FROM tbl
with tmp(plant_date) as
select cast('20130101' as datetime)
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select plant_date + 1
from tmp
where plant_date < '20131231'
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option (maxrecursion 0)
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May I sign one AppleID into multiple AppleTVs simultaneously?
And does the answer change for first, second and third generation AppleTVs?
Can these two devices, signed in with one ID, pull stream content from one computer?

I would say Yeah As it Can be used on several other iOS devices at once and osx devices too

Simultaneously triggered acquisition: Multiple PXIe-7962R + NI-5734 cards, across multiple PXIe-1085 chasses

Hi all,
I need to do high-frequency, high-channel-count acquisition.
Specs
Signals: 10 MHz, 60 channels
Controller: PXIe-8135 (Windows 7)
Chasses: PXIe-1085 (2x)
Input cards: PXIe-7962R FlexRIO base with NI-5734 digitizer (15x)
Description
Each FlexRIO card will store data in circular buffers, and continuously monitor the voltage levels. When any one channel exceeds the user-defined threshold, all 60 channels need to be triggered simultaneously to pass waveform data (200 μs pre-trigger, 300 μs post-trigger) to the host OS for logging.
In other words, every FlexRIO card needs the ability to fire the trigger, which is then received by all 15 FlexRIO cards (the card that fires the trigger also needs to receive the trigger).
Question
Can I achieve this with only a single PFI line? Or do I need some other technique?
I've found some examples, but they only show single-source and single-card triggering, e.g. https://decibel.ni.com/content/docs/DOC-30182 uses one analogue input to trigger the acquisition of 2 channels on the same card.
Any advice would be much appreciated. Thanks!

Assuming you are using LV 2013 or 2014 you should download version 1.3.4 of the FlexRIO Instrument Development Library (FIDL). This will install 5734 Acquisition Engine examples which use the MultiRecord Library to stream data to the DRAM in a circular buffer, allowing you to recover pre-trigger samples. The example also demonstrate how to implement the Syncrhonization Library that synchronizes triggered acquisition to within a single sample period across multiple devices.
Getting the example to work across two chassis' may be difficult, but I believe it is possible. Though to do so you will need a timing and sync module in each chassis to distribute the triggers and reference clock that the sycnrhonization library requires.
National Instruments
FlexRIO Product Support Engineer

I want to acquire data for multiple channels using PCI 6120 that works on traditional DAQ. I cannot access more than one channel, can someone help me or if someone has data acquisition vi for PCI 6120, please send me over . Thanks

I have PCI 6120 card and I want to acquire data for more than one channels. I'm using traditional DAQ to get it. But it does not work for more than one channels. If someone has a data acquisition vi for PCI 6120. Or some suggestion how to aquire data please let me know.
Thanks

Hello DSPGUY1,
You can definetly acquire from several channels. For your convenience, I have appended below the content from help that tells you how to configure it:
"channels specifies the set of analog input channels. The order of the channels in the scan list defines the order in which the channels are scanned during an acquisition. channels is an array of strings. You can use one channel entry per element or specify the entire scan list in a single element, or use any combination of these two methods. If x, y, and z refer to channels, you can specify a list of channels in a single element by separating the individual channels by commas, for example, x,y,z. If x refers to the first channel in a consecutive channel range and y refers to the last channel, yo
u can specify the range by separating the first and last channels by a colon, for example, x:y."
Hope this help.
Serges Lemo
Applications Engineer
National Instruments

Multiple Sound Card for data acquisition gives read buffer error

I am using 6 usb based sound cards for voltages and currents mearuments of a three phase delta system.. Hardware is working well. but in labview when i use builtin Input=>sound box for data acquisition it also works well upto 4 inputs... but when i use more i.e. 6 it starts giving error "cannt perform action, read buffer is full" some thing like this... som times it goes to "not responding"...i have tried to find the solution and found in another post of this fourm to varry the sampling rate... i did it upto 96000 that is maximum ... but still problem is same...i need to know, how to manually increase the read buffer. if not possible then.. is there any way that labview stop giving any type of error during simulation?

thnx i hv solved that problem ... now there is another problem... i am getting all my signals in computer but problem comes when i use phase detector. it keep on showing different values in phase measurement block.. how can i manage the signal with correct phase. i cannt send code cz it has many VIs and they are spread in computer. so i am pasting come photos that are showing different. look in picture...it is from same signal and the phase is different..
Attachments:
Capturexcvxccxvxcvcxvvxcvxcv.JPG ‏11 KB
Capturexcvxcvxcvxcv.JPG ‏11 KB

Data acquisition from multiple channels.

Hello
Right now, I am able to acquire the signal from a single load cell and display it.But I would like to know of how to acquire acquire signals from two load cells simultaneously.I am using Labview 6i and I am using AI S-Scan with AI config to acquire the waveform.It would be of great help if you could suggest a simple method to acquire the signals.
PS: Please find the attached file used for acquisition from a single load cell.
Looking forward for your reply.
Manasa
Attachments:
test 4.vi ‏102 KB

Hi Manasa,
If I understand what you are trying to do, it is relatively
straightforward to configure your application to acquire data on two channels.
I was unable to run your vi as it was missing some of the subVI’s
from your application. However, your
attachment was sufficient to see what you are trying to do.
Here is how to add channels:
1.
In the I/O Channel Constant, you can add
additional channels by using a comma or a semi-colon. For example, to scan the first four channels
you would put 0:3 in the constant (see attached screenshot ChannelConfig.jpg). To scan the first and third channel you would
put 0,2.
2.
The AI Single Scan VI will now read from
multiple channels. Often it easiest to
configure the output of this VI for viewing by first putting the data into an
array using the Build Array VI. It can
then be plotted in a waveform graph. (see attached screenshot ReadtoGraph.jpg
and WaveFormGraph.jpg)
Just a few notes about “simultaneous” sampling:
Most of the NI data acquisition cards have a multiplexer
between the various input channels and the Analog to Digital (A/D) converter
creating a very small delay between each channel (usually ms range or
smaller). NI does make several data acquisition
cards that can perform true simultaneous sampling, meaning that there is an A/D
converter for each channel.
For the large majority of applications, the small delay
between channels is negligible.
Jared T.
Attachments:
ReadtoGraph.JPG ‏21 KB
ChannelConfig.JPG ‏288 KB
WaveFromChart.JPG ‏61 KB

Data-acquisition with NI 6036E DAQ card & GPIB using an external trigger

Hi all,
I hope somebody could give me some help with the following and answer some questions:
Simple system description:
Labview 6.1
PCI-GPIB card
6036E DAQ card
In my system, I am using an external analog trigger signal (A) for continuous data-acquisition. Characteristics of the analog trigger signal (A) are: ~40 Hz, signal height +1.48V, triggered by rising edge (the analog trigger signal (A) could be changed to a TTL signal). Each data-acquisition is done within ~1.0 ms after the rising edge of the trigger pulse. The timing of the data-acquisition and analyzing procedure is controlled by execution in a sequence structure placed in a loop.
Now, I connected a power meter to the system, to measure the laser power during the data-acquisition. The power meter has two options to provide the laser power data:
a) via analog signal output (voltage corresponds to laser power in watts)
b) via GPIB (direct output reading of laser power in watts).
Problem:
During a certain point in my data-acquisition sequence structure (defined by a frame), I want to use the next occuring analog trigger signal (A) to acquire 1 value from the power meter.
How do I do this in Labview programming for the following two situations?
a) If I connect the analog output from the power meter to an analog input channel of the 6036E DAQ card. The analog trigger (A) would be connected to a second analog input channel (In case the analog trigger signal (A) is changed to a TTL signal it would be connected to the PFI0/Trig input pin on the DAQ card).
b) If I use the GPIB connection of the power meter. The analog trigger (A) would be connected to a second analog input channel (In case the analog trigger signal (A) is changed to a TTL signal it would be connected to the PFI0/Trig input pin on the DAQ card).
An other possibility would be to trigger the power meter directly, so it outputs constantly power meter values at ~40 Hz. How could I than acquire 1 power meter value (at a certain time im my sequence structure) via analog input at DAQ card or GPIB?
Additional questions:
How do I configure the PFI0/Trig pin on the 6036E DAQ board individually as an INPUT?
How do I use an analog trigger signal (A) as counting signal for a loop, or as an activation signal for a sequence structure which includes GPIB commands?
It would be very nice if somebody could give me some help.
Kind regards,
beam

Hi beam,
I just want to verify that I understand your situation correctly:
An external trigger signal (A) is wired to one of your input channels (e.g. CH0) to trigger data acquisition of a second channel (e.g. CH1). Your power meter is connected to an analog input channel, which you would like to trigger with a certain rising edge at some of your sequence structure.
Problem:
During a certain point in my data-acquisition sequence structure (defined by a frame), I want to use the next occuring analog trigger signal (A) to acquire 1 value from the power meter.
How do I do this in Labview programming for the following two situations?
a) If I connect the analog output from the power meter to an analog input channel of the 6036E DAQ card. The analog trigger (A) would be connected to a second analog input channel (In case the analog trigger signal (A) is changed to a TTL signal it would be connected to the PFI0/Trig input pin on the DAQ card).
If a task has been configured to acquire signal from one analog channel, it's not possible to run a second analog input task or to add a second channel on the fly. You had mentioned that it's possible to read from the instrument through GPIB. Is it possible to perform a software trigger such that at a certain frame of your structure, when the trigger signal A reaches voltage "x", a GPIB command is written to your power meter to query a measurement reading?
Additional questions:
How do I configure the PFI0/Trig pin on the 6036E DAQ board individually as an INPUT?
You do not need to explicitly configure the PFI0 line as an input. If you want to use it as an input such that it acts as an analog trigger, simply wire the trigger signal to this pin. When configuring the trigger in your software, specify PFI0 as the trigger source.
How do I use an analog trigger signal (A) as counting signal for a loop, or as an activation signal for a sequence structure which includes GPIB commands?
You can try using the Limit VI to find out when the trigger signal reaches a certain level, and count how many times this level is reached. Similarly, you can use this as the condition to execute GPIB commands.
Hope this helps,
Lesley

Can I develop a data acquisition app without the DAQ card installed?

I'm new to LabView.
I would like to build a simple data acquisition app (graphical display and logging). I would prefer to build this on my desktop, and then install/run it on a laptop.
I'm not sure how to work this as the DAQ card and driver are not installed on my desktop. Is there a (hopefully) simple way to configure a data source in labview so that the app will automatically (or at least easily) connect to the existing driver?
At the end of the day I don't want to install the complete dev system on my cheap little laptop just for this one application.
TIA,
Michael

yes you can develop an application without having a daq card installed. You still will use the same functions in labVIEW. If you are using labVIEW 6.1 they are under the data acquisition palette in the block diagram. If you are using LV7 there are now two types of data acquisition functions. Traditional NI Daq (before lv 7) and new Daq MX. The daq functions are under the NI Measurements palette in LV7. If you are new to LV I suggest you use the daq assistant on the bottom of the palette. This will allow you to easily configure what you want, the drawback is that you will need to use this on the computer that has the card. So try the traditionaly nidaq functions. They will allow you to develop without the card. hope this helps.
BJD1613
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I have the eyefi wireless sd card in my camera and it is setup to transmit my photos into iphoto automatically, which it does. However, the problem arises in that iphoto creates multiple events for the same date each containing only one photo. I would prefer that iphoto create individual events per date and have the multiples of that date's photos within. I thought I had the settings configured to do so as I have preferences set for autosplit events one per day but I still see events such as - July 3, 2008 - July 3, 2008 - July 3, 2008 - each with only one photo inside.
I am wondering if it is something in iphoto's settings or the way in which eyefi transmits the photos into iphoto.
Any thoughts?

I do not have a WiFi connection to my camera so can not test but am just guessing
I can think of two possibilities
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My sister has 3 children. I have her name in AddressBook that synchs with I-Cal.
I have her birthday listed but I want to find a means to list her childrens birthdates on the same address card so they appear in I-Cal too.
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Hi,
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One card triggering multiple 6071E simultaneous data acquisition

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