CRIO 9025 Data Logging (128+ Channels at @ 1000Hz)

Hello,
I have the following configuration:
(1) cRIO 9025 controller on a NI 9118 8-slot Virtex-5 FPGA chassis, loaded with AI/TC modules
(2) NI 9144 8-slot EtherCAT expansion chassis connected to the 9118 via EtherCAT, loaded with AI/TC modules
I have been tasked with recording data on ALL of these channels at 1000Hz. I have been toying with various types of software architectures and cannot come up with an optimal system. I would like to log data directly to the cRIO 9025's on-board storage (and later retrieve via FTP).
What is the best way to approach this? What type of architecture should I be using?
Any help is very appreciated. Thanks!

Hi SR,
Unfortunately, you won't be able to daisy chain multiple 9024 controllers. As explained in this Developer Zone article, you can use a 9024 as a master with a series of 9144 slave chassis. If you're using multiple 9024s, you'll want to put them on on the same network and write a master application that communicates with all of the systems. Hope that helps.
Andy H.
National Instruments

Similar Messages

CRio data logging too slow

Hi,
I am using a cRio 9074 in scan mode and I have a fairly simple timed loop that should run at 5-10mSec periods to operate a pwm control. I also need to do some data logging and save two input signals (at approx. 1kS/sec). However, when I use write to spreadsheet, the loop speed drops and my timed loop period goes up to 50mSec. How can I speed this up, and what is the efficient way to save data in scan mode.
Thanks.
Solved!
Go to Solution.

The single best way to improve determinism is to divide your acquisition/logging into two distinct producer/consumer loops as VTHokie says. Next best improvement would probably be using a binary format file structure rather than Write to Spreadsheet, which converts all data to ASCII representation prior to writing to file. Writing to ASCII files rather than binary files degrades performance in four ways:
CPU must be used to do the number to text conversion
ASCII represented numbers lose precision and don't exactly convert back to original data
The filesize is larger
When you go to read the file, it's slower for the above three reasons
On the other hand, an ASCII file is more portable - e.g., you can easily import into a third-party spreadsheet analysis program. But who in their right mind would export data OUTSIDE of LabVIEW when it offers best-in-industry analysis tools?
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Pulsewidth data logging with counter channel

Hello everyone.
i have query with data logging of pulse duration measured with counter input into .lvm file
pulse signal contain frequency of 100 hz with pulse duration vary from 2 to 8 ms
i want to log pulse duration in .lvm file.
when running vi(below screen shot) i find data logg with duplicate instance of time.
i want to log pulse duration data with every ridging or falling edge of pulse.
so if i run vi for 20 sec i sould have 2000 reading of pulse duration in my.lvm file with appropriate time in time column
Attachments:
pulsewidth using counter.jpg ‏659 KB

Hello Karthik,
I can think of two ways I would approach this. One would use software timing, and the other would use hardware timing.
1. Software timing: This might be the easiest approach. The idea is you would use your example much as it is written, then use a loop with a delay as the "Time between samples" to call your counting code over and over. In this case, I have a few suggestions for your code. First, instead of the loop, you could start the counter, use a delay in a sequence structure (use "Wait (ms)", not "Wait Until Next ms Multiple")for your "Sampling time", then read the counter and stop. After the stop you'll need another "Wait (ms)" in a sequence structure for your "Time between samples". Finally, wrap a loop around all of this to r
epeat it. One advantage of this approach is the user can change the between time on the fly.
2. Hardware timing: The idea behind this would be to use two counters. The first would count, the output of the second would be wired to the gate of the first to control when the first counts. The second counter would be programmed to output a pulse train where the positive portion of the pulse would be your "Sampling time" and the negative portion would be your "Time between samples". The creative part for this approach would be figuring out when to read the count. One way to do this would be to also connect the gate of the second counter to an analog input, then read the count whenever the input goes low (say, below 1 volt). This approach might be the more accurate of the two. However, you would always be getting a total count, so you would have to subract the previous count each time. Also, you would not be able to change your sampling time or between time once you start.
Finally
I'd suggest looking at some examples - you can usually find code to help you.
Best Regards,
Doug Norman

FPGA Data logging

Hello
I m using a CRio9074 and NI9215 module. I implement the exmple for fpga data logging given at http://www.ni.com/white-paper/11198/en/.
I 've just conected a DC signla one channel and the program does not show anything or noise. I attach the project. Can somebody help ?
Thanks
Attachments:
Fpga_Daq.vi ‏41 KB
RT_Daq_log.vi ‏125 KB

Hi user,
do you get any errors while the program runs? Did you debug it?
Where is your data saved? I hope you don't expect the cRIO to save a file on your (Windows?) PC harddisc…
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

How do I control a data log session with period and sample time?

I need a data logging system where the operator can select 2 logging parameters: Log Period and Sample Time. I also need a START and STOP button to control the logging session. For example, set the log period for 1 hour and the sampling time for 1 second. (I may be using the wrong jargon here.) In this case when the START button is clicked, the system starts logging for 1 second. An hour later, it logs data for another second, and so on until the operator clicks the STOP button. (I will also include a time limit so the logging session will automatically stop after a certain amount of time has elapsed.)
It’s important that when the STOP button is clicked, that the system promptly stops logging. I cannot have the operator wait for up to an hour.
Note that a logging session could last for several days. The application here involves a ship towing a barge at sea where they want to monitor and data log tow line tension. While the system is logging, I need the graph X-axis (autoscaled) to show the date and time. (I’m having trouble getting the graph to show the correct date and time.) For this application, I also need the system to promptly start data logging at a continuous high rate during alarm conditions.
Of course I need to archive the data and retrieve it later for analysis. I think this part I can handle.
Please make a recommendation for program control and provide sample code if you can. It’s the program control concepts that I think I mostly need help here. I also wish to use the Strip Chart Update Mode so the operator can easily view the entire logging session.
DAQ Hardware: Not Selected Yet
LabVIEW Version: 6.1 (Feel free to recommend a v7 solution because I need to soon get it anyway.)
Operating System: Win 2000
In summary:
How do I control a graphing (data log) session for both period and sample time?
How do I stop the session without having to wait for the period to end?
How do I automatically interrupt and control a session during alarm conditions?
Does it make a difference if there is more than one graph (or chart) involved where there are variable sample rates?
Thanks,
Dave

Hello Dave,
Sounds like you have quite the system to set up here. It doesn�t look like you are doing anything terribly complicated. You should be able to modify different examples for the different parts of your application. Examples are always the best place to start.
For analog input, the �Cont Acq&Chart (buffered).vi� example is a great place to start. You can set the scan rate (scans/second) and how many different input channels you want to acquire. This example has its own stop button; it should be a simple matter to add a manual start button. To manually set how long the application runs, you could add a 100 ms delay to each iteration of the while loop (recommended anyway to allow processor to multi-task) and add a control that sets the number
of iterations of the while loop.
For logging data, a great example is the �Cont Acq to File (binary).vi� example.
For different sample rate for different input lines, you could use two parallel loops both running the first example mentioned above. The data would not be able to be displayed on the same graph, however.
If you have more specific questions about any of the different parts of your application, let me know and I�ll b happy to look further into it.
Have a nice day!
Robert M
Applications Engineer
National Instruments
Robert Mortensen
Software Engineer
National Instruments

Help please: DAQWare or data logging software (multichannel data capture) questions

I am writing regarding DAQWare, data logging software, and the PC-LPM-16
board, which a group of us a trying to come to grips with. This is rather
lengthy, I'm afraid...
We are a group of college students in a computer programmer/analyst
program. We have a course that involves doing a project to go through the
software development lifecycle (or as much of it as can be done in a term).
For our project we teamed up with a group in the industrial hygiene
program; they have a computer (standalone) with a PC-LPM-16 (PnP) DAQ board
and the NI-DAQ software (all of this has been around for a few years, but
has not been used much), and our goal was to capture the data they are
measuring (atmospheric pollutants) to an Microsoft Access database.
We are not familiar with DAQ systems, but were shown the software they had
installed. This included DAQWare (appears to be version 2.0). We thought
we could use DAQWare to log data to a text file, which we then would import
into the Access database. We came up with VBA code to parse the ASCII text
file created, but have run into one problem: DAQWare does not timestamp
each sample, but only puts a single timestamp in the header information.
Now we could extrapolate the time for each line based on the sample rate,
except that sometimes it seems to put in 8 values per sample, sometimes 12
values. For instance, in the sample of a text file below, the capture was
run for 1 minute at a sample rate of 60, and there were 480 measurements in
the file, or 8 lines of measurements per sample. (At a sample rate of 100,
we got 800 measurements in the file etc.) This was two weeks ago. Today,
we returned to capture more data, and DAQWare was logging 12 measurements
per sample (so at a sample rate of 100, we ended up with 1200 lines of
measurements). We do not know where this factor of 8 or 12 is coming from
or how it got changed in the two weeks between captures. We would like to
be able to have them just run DAQWare, for days on end if they wanted,
capture the data to file, then use our code to parse the text file into the
database, but if we cannot put timestamps on the readings, there seems no
point.
*** Example of a capture below... ***
DAQWare File
Version: 2.0
Number of Lines in Header: 10
Comment:
Date: 10-18-1999 Time: 10:01:39
Sample Rate: 60.0
Scan Rate: 0.0
File Format: 1
Samples per Channel: 480.0
Number of Channels: 5
O3 SO2 NOX NO2 NO
4 3 2 1 0
1 1 1 1 1
0.537 0.276 0.259 -0.017 0.015
0.537 0.273 0.261 -0.022 0.012
0.537 0.276 0.259 -0.037 0.012
0.537 0.276 0.264 -0.007 0.015
*** and so on... ***
Regarding this attempt to use DAQWare:
1. Can you tell us where this factor (8 or 12 or however many more readings
than we would expect) means, where it is read from or set?
2. Is there an updated version of DAQWare that we should download that
would be better?
3. Is there some other existing software that we can download to use to
perform basic logging of multichannel analog input to a text file (with
timestamp)?
I realise that the software comes with tools (DLL functions) that one can
use to create custom software to interface with the DAQ board, but in the
limited amount of time we have we are not sure we can learn enough about
these functions to write our own datalogging software.
However, to see if I could grasp the basics, I have looked through the
examples for Visual Basic and think that a program would run something like
this:
1. at the beginning, use LPM16_Calibrate to reset the board
2. configure acquisition with DAQ_Config
3. start acquisition with Lab_ISCAN_Start
4. loop to check is acquisition done with Lab_ISCAN_Check
5. once sampling done, write data out to file
6. loop back up to 3 to get next lot of samples
Unfortunately, a sample app using Access and VBA I created came back with
an error telling me it could not find nidaq.dll (even though this is in the
Windows system directory); probably it is not a good idea to try to do this
in Access in the first place. I am going to have a go using Delphi, which
I know a bit better.
One thing I am unsure of is what the numbers will be coming out of
Lab_ISCAN; the reference file seems to indicate they will be binary
readings, not voltages, and I wonder how to correlate these with instrument
measurements (the instrumentation people we going to set it up so that
1mV=1ppm).
Any help you can give to point us in the right direction would be
appreciated.
Sincerely, Marc Bell ([email protected])

I am writing regarding DAQWare, data logging software, and the PC-LPM-16
board, which a group of us a trying to come to grips with. This is rather
lengthy, I'm afraid...
We are a group of college students in a computer programmer/analyst
program. We have a course that involves doing a project to go through the
software development lifecycle (or as much of it as can be done in a term).
For our project we teamed up with a group in the industrial hygiene
program; they have a computer (standalone) with a PC-LPM-16 (PnP) DAQ board
and the NI-DAQ software (all of this has been around for a few years, but
has not been used much), and our goal was to capture the data they are
measuring (atmospheric pollutants) to an Microsoft Access database.
We are not familiar with DAQ systems, but were shown the software they had
installed. This included DAQWare (appears to be version 2.0). We thought
we could use DAQWare to log data to a text file, which we then would import
into the Access database. We came up with VBA code to parse the ASCII text
file created, but have run into one problem: DAQWare does not timestamp
each sample, but only puts a single timestamp in the header information.
Now we could extrapolate the time for each line based on the sample rate,
except that sometimes it seems to put in 8 values per sample, sometimes 12
values. For instance, in the sample of a text file below, the capture was
run for 1 minute at a sample rate of 60, and there were 480 measurements in
the file, or 8 lines of measurements per sample. (At a sample rate of 100,
we got 800 measurements in the file etc.) This was two weeks ago. Today,
we returned to capture more data, and DAQWare was logging 12 measurements
per sample (so at a sample rate of 100, we ended up with 1200 lines of
measurements). We do not know where this factor of 8 or 12 is coming from
or how it got changed in the two weeks between captures. We would like to
be able to have them just run DAQWare, for days on end if they wanted,
capture the data to file, then use our code to parse the text file into the
database, but if we cannot put timestamps on the readings, there seems no
point.
*** Example of a capture below... ***
DAQWare File
Version: 2.0
Number of Lines in Header: 10
Comment:
Date: 10-18-1999 Time: 10:01:39
Sample Rate: 60.0
Scan Rate: 0.0
File Format: 1
Samples per Channel: 480.0
Number of Channels: 5
O3 SO2 NOX NO2 NO
4 3 2 1 0
1 1 1 1 1
0.537 0.276 0.259 -0.017 0.015
0.537 0.273 0.261 -0.022 0.012
0.537 0.276 0.259 -0.037 0.012
0.537 0.276 0.264 -0.007 0.015
*** and so on... ***
Regarding this attempt to use DAQWare:
1. Can you tell us where this factor (8 or 12 or however many more readings
than we would expect) means, where it is read from or set?
2. Is there an updated version of DAQWare that we should download that
would be better?
3. Is there some other existing software that we can download to use to
perform basic logging of multichannel analog input to a text file (with
timestamp)?
I realise that the software comes with tools (DLL functions) that one can
use to create custom software to interface with the DAQ board, but in the
limited amount of time we have we are not sure we can learn enough about
these functions to write our own datalogging software.
However, to see if I could grasp the basics, I have looked through the
examples for Visual Basic and think that a program would run something like
this:
1. at the beginning, use LPM16_Calibrate to reset the board
2. configure acquisition with DAQ_Config
3. start acquisition with Lab_ISCAN_Start
4. loop to check is acquisition done with Lab_ISCAN_Check
5. once sampling done, write data out to file
6. loop back up to 3 to get next lot of samples
Unfortunately, a sample app using Access and VBA I created came back with
an error telling me it could not find nidaq.dll (even though this is in the
Windows system directory); probably it is not a good idea to try to do this
in Access in the first place. I am going to have a go using Delphi, which
I know a bit better.
One thing I am unsure of is what the numbers will be coming out of
Lab_ISCAN; the reference file seems to indicate they will be binary
readings, not voltages, and I wonder how to correlate these with instrument
measurements (the instrumentation people we going to set it up so that
1mV=1ppm).
Any help you can give to point us in the right direction would be
appreciated.
Sincerely, Marc Bell ([email protected])

How to transmit counter input data of different channels simultaneously?

Hello.
I'm using X-series PCIe-6361 DAQ board which have 8 DMA channels and Labview 8.2.1. I upgraded the version of DAQmx as 9.0 which supports the X-series devices and confirmed the board worked normally on my system.
I'm trying to measure the pulse width continuously from 4 different pulse trains with CMOS level. The frequencies of signals are same but the pulse width and phase are varying with respect to time.
http://zone.ni.com/devzone/cda/tut/p/id/9376
From the tutorial page of NI X-series, I saw the following expression "X Series also includes eight DMA channels to stream data directly
between the device and PC memory without CPU interaction or additional
programming effort. These eight channels provide parallel data streams for the analog I/O, digital I/O, and all four counter/timers."
But when I started the Labview programming, I realized that the counter functions of different channel cannot be put into a single task. So I couldn't help but separate the read functions into 4 individual tasks and there are timing differences in data transmission between channels up to 250 micro-sec because of the sequential running.
How can I eliminate the timing difference and realize parallel data streams for the counter?

Check out these links. I hope that they help!
Fieldpoint and RT
Logging Data with a FieldPoint FP-20xx to View in a Web Browser
Transferring Files from a FieldPoint FP-20xx through an FTP Server
Introduction to Using DataSocket Commands to Communicate with FieldPoint Etherne
t Network Modules
Good Luck!
Mike
NI

I have an optical sensor and two hall effect how can I data log?

I have built a test rig which consists of a gyroscope. The gyro is spun up by and electric motor.
I need to measure the speed of rotation. I’m using an optical sensor and two Hall
Effect sensors. I would like to record the
output of these and I would like to build in some redundancy because there will
be another bigger rig that will require more measurement. E.g. vibration.
I’m new to data logging so I’m not sure which hardware I
should be getting.
Thanks

analog inputs are the most universal. with software such as the functions included in the Sound and Vibration Measurement Suite, you can analyze the analog input channel which is connected to your hall effect and optical sensors for frequency and speed. Vibration specific input cards will power accelerometers. with the speed and angular position sensors (hall effect and optical) you can combine this information with your vibration sensors to determine the movement of the device with respect to position and speed. These order analysis functions are part of the Sound and Vibration Measurement Suite.
What is more is that the Suite includes an assistant. The assistant allows for the capture and datalogging of all analog and digital inputs as well as frequency and vibration analysis. This is all configurable and does not require any LabVIEW programming. If you decide you want LabVIEW programming, all the functions are there to support LabVIEW as well.
Here is the link:
http://www.ni.com/soundandvibration/
Preston Johnson
Principal Sales Engineer
Condition Monitoring Systems
Vibration Analyst III - www.vibinst.org, www.mobiusinstitute.com
National Instruments
[email protected]
www.ni.com/mcm
www.ni.com/soundandvibration
www.ni.com/biganalogdata
512-683-5444

Multi-task data logging with DAQmx

I was wonder is it possible to use 'DAQmx Configure Logging' VI and 'DAQmx Start New File' VI for multiple tasks? I'm doing synchronized high speed DAQ with NI PXI-6133 cards. Each card (there are 16) must have its own task. Although the DAQ is continuous, the user (software trigger) determines when data is saved to the disk and for how long.
In my scenario the test length could be up to an hour with various test events scatter throughout. The users want to display the data during the entire test length. However they only want to write the data to disk during an event. The event could last from 10 sec to 1 min. That is why the users want to control when data is written to the disk.
DAQmx Logging seems to work for a single task only, but I need to do multiple tasks.

I've attempted to implement your suggestion, but I still do not acquire data for all channels for all tasks. I've enclosed my VI.
Attachments:
TDMS Logging with Pause LoggingFSPR.vi ‏55 KB

CRIO 9025- FPGA - Not able to access c-series modules integrated with chassis

Hi,
I am using NI cRIO 9025 module. I have conncected the chassis with few cSERIES channels for voltage and current sensing.
When I tried to configure, I am getting the following error
Access denied: This target is running a version of LabVIEW Real-Time that is different than the Real-Time Module software on the host computer. You can verify the version and reinstall the Real-Time software using Measurement & Automation Explorer.
I tried to use Add/Remove option from MAX. But I am not able to update the real time software on cRIO
I am using Labview 12.0 on host computer and on target cRIO9025 - 11.0.1 version real time is installed.
Please kindly help to update the software on target module.
Thanks
Ravi Kishore

NMAYO,
In your project view can you right click on the chassis in the cRIO and make sure that it is set for Scan Mode and not FPGA mode? Also, In the measurement and automation explorer you can check the cRIO and verify that it has Scan Engine Support installed on it. The tutorial below shows how to reformat a cRIO and install software on it, the later steps on software will allow you to check your cRIO.
Reformatting a CompactRIO Real-Time Embedded Controller
Ben Sisney
FlexRIO V&V Engineer
National Instruments

Who worked with ICS' Model 4896 GPIB? I can not count the data from the module. Can prompt as it to make. It is desirable with examples (data read-out from the module and data transmission between channels. It is in advance grateful.

I can not count the data from the module. Can prompt as it to make. It is desirable with examples (data read-out from the module and data transmission between channels. It is in advance grateful.

Hello. Most of the engineers in developer exchange are more familiar
with NI products. Contacting ICS for technical support is a better
course of action.

How can I display only the Data Logging pull down menu on my LV front panel?

Is it possible to hide all unused pull down menu on my front panel vi like File, Edit, View etc.. and only
display the pull down menu for the Data logging?!
best regards
Norick

Hey,
You can build your own runtime menu (Edit>runtime menu) and then e.g. only display the application items you want to.
Christian

How can I perform data logging for a specific time??

hello everyone,
I am quite new in labview and I have a basic question regarding data logging. Currently I am using a cRIO9074 and doing some data logging for my test. The data logging it self works ok so far.
But my problem is I would like to write my datas in a text file either for a specific time interval (ex)10 seconds) or for a specific amounts of data (ex)500 Samples). Can anyone give me some help regarding my problem?? Attached you can find my RT.vi
I would appreciate for anyhelp!
Regards
Yun
Attachments:
BP250 Encoder Position & Velocity (Host).vi ‏92 KB

Run your loggging program for that time. When your program terminates then it will write all the logged data so far in text file.
Kudos are always welcome if you got solution to some extent.
I need my difficulties because they are necessary to enjoy my success.
--Ranjeet

With journaling, I have found that my computer is saving a large amount of data, logs of all the changes I make to files; how can I clean up these logs?

With journaling, I have found that my computer is saving a large amount of data, logs of all the changes I make to files; how can I clean up these logs?
For example, in Notes, I have written three notes; however if I click on 'All On My Mac' on the side bar, I see about 10 different versions of each note I make, it saves a version every time I add or delete a sentence.
I also noticed, that when I write an email, Mail saves about 10 or more draft versions before the final is sent.
I understand that all this journaling provides a level of security, and prevents data lost; but I was wondering, is there a function to clean up journal logs once in a while?
Thanks
Roz

Are you using Microsoft word? Microsoft thinks the users are idiots. They put up a lot of pointless messages that annoy & worry users. I have seen this message from Microsoft word. It's annoying.
As BDaqua points out...
When you copy information via edit > copy, command + c, edit > cut, or command +x, you place the information on the clipboard. When you paste information, edit > paste or command + v, you copy information from the clipboard to your data file.
If you edit > cut or command + x and you do not paste the information and you quite Word, you could be loosing information. Microsoft is very worried about this. When you quite Word, Microsoft checks if there is information on the clipboard & if so, Microsoft puts out this message.
You should be saving your work more than once a day. I'd save every 5 minutes. command + s does a save.
Robert

How do I configure 128 channels of DIO and 128 channels of Analog output with the availability of 3 pci slots

I have only 3 slots of PCI or 4 slots of ISA bus, I want to configure with the minimum possible modules to attain 128 channels of DIO and 128 channels of analog output. This is inturn fed to the PCM (Pulse code Modulator). The cards will be placed in industrial PC.

Associate Engineer-Marketing,
Using just those 3 PCI slots you're not going to be able to get the 128 analog output channels. You will probably want to go either the MXI-3 (PCI bus extender) to a PXI chassis or E Series DAQ card to a SCXI chassis for such a high channel count system. Which analog output cards and which digital I/O cards you will want depends on your application. You will have to decide whether you will need static or dynamic analog output as well as whether you need clocked digital I/O or not. I highly recommend contacting our internal sales department at 1-800-433-3488. They are great at helping specify systems.
Ames
Applications Engineering
National Instruments

CRIO 9025 Data Logging (128+ Channels at @ 1000Hz)

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