Selection of daq board to find angular position of 6 motors using encoder

can you suggest me best daq board to use 6 motors positions as outputs using encoders attached to the motors. i will be using single counter for each motor. Or can i use a single counter for all the motors encoders??
Solved!
Go to Solution.

Hello Prabhakar7117,
You would need a counter for each encoder. Since you will be using 6 encoders, you should get a DAQ device with 6 or more counters. Take a look at the PCI-6624 or PCI-6602. Another option would be a CompactDAQ chassis with modules that are able to access the counters. Take a look at them.
PCI-6624
PCI-6602
KB Which cDAQ Modules can be Used to Access the On-board Counters?
Best Regards,
Alina M

Similar Messages

How do i use my NI 6216 daq to find a angular position of an incremental encoder

i have a ni 6216 daq baord and an incremental encoder (i dont know the pulses per revolution of encoder). How do i write a labview code to get the angular positon of a motor wihch is interfaced with the encoder. How can i know the pulses per revolution of the incremental encoder.
Thanks.

Hi,
My name is Thomas and I am an application engineer at National Instruments.
I looked through some of the information we have on file for incremental encoders and found a couple of documents that may be of help to you.
Follow this link for some general documentation on setting up an incremental encoder to measure the angular position of your motor.
Follow this link for some example code off of which to build your application.
As you alluded to, we are going to need to know at how many pulses per revolution your encoder runs. Which encoder are you using? With a bit of research we can hopefully learn the specifications for your specific encoder.
Best Regards,
Thomas B.
National Instruments
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DAQ board for ADXL202AE accelerometer

I am tring to find a good DAQ board that will be connected to ADXL202AE (Analog Device). It's first time to use this accelerometer. The PDF file is attached. X out and Y out will be used. I also would like to know where X out and Y out can be connected in any DAQ board.
Attachments:
ADXL202E_a.pdf ‏147 KB

Greetings,
In addition to a DAQ board you will most likely need some sort of signal conditioning for your accelerometer. We offer two primary conditioning lines, either SCXI or SCC. For accelerometers you will be interested in either the SCXI-1530 or the SCC-ACC01.
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http://sine.ni.com/apps/we/nioc.vp?lang=US&pc=mn&cid=3387
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I recommend using the following utility to narrow down your search for a DAQ card.
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ttp://sine.ni.com/apps/we/nioc.vp?cid=1037〈=US
From glancing over the specs for this accelerometer it loks as if Xfilt and Yfilt are just analog output channels. In this case, you can just connect these to the analog input lines of your MIO DAQ board. Once you select the DAQ board that is the best fit for you, the User Manual can be found online at http://www.ni.com/manuals.
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DAQ board no longer showing up in MAX, nor elsewhere.

I can no longer see my DAQ board in MAX, nor LabVIEW 7.1. It's a PCI-6023E, which was working fine last week.
I tried reinstalling MAX through the Control Panel >> Add/Remove
Programs, but it is not there. In "Add/Remove Programs", II click on
"National Instruments Software", but that causes my computer to hang.
I tried downloading the latest NI-DAQ, but it thinks it has nothing to
install. I explicitly use it to remove LabVIEW 7.1 support, then
re-install it, but my DAQ board is still invisible.
How can I communicate with my DAQ board again?

Hello Bmihura,
There is a utility called MSIBlast that can be used to remove software
from your computer when the Add/Remove Programs does not work.
For future reference, it sounds like some portion of your National
Instruments software has become corrupted during an installation.
It is important to strictly follow installation procedures outlined at
http://www.ni.com/support/install/
. Also, if your device does
not show up in MAX, it probably is a result of an incorrect driver
installation, and not a problem with the MAX program.
The first thing you will want to do is remove the hardware from your
computer. Then, to get the MSIBlast utility, copy and paste the
following in an Internet Explorer web browser window:
ftp://ftp.ni.com/outgoing/
Find MSIBlast.exe and drag and drop it onto your desktop. To run
the utility, simply double-click on the executable. In the dialog
box, make sure you have 'Show NI Installers Only', and you should see
a list of National Instruments software installed on your
computer. Go through the list and select the components that you
wish to remove and click the 'Uninstall' button.
Once you have uninstalled all of the software that you could not
uninstall through Add/Remove Programs, restart your computer and verify
that everything was uninstalled through Add/Remove Programs. At
this point, if you chose to uninstall LabVIEW, that should be the first
thing to reinstall. Otherwise, go ahead and reinstall DAQmx
8.0. I would recommend re-downloading it from our website here
just in case the installer became corrupted during the download
process. After the driver is installed, now is the time to power
down your computer and physically install your hardware in a spare PCI
slot. When you restart your computer, Windows should recognize
new hardware and you should allow the wizard to install the driver
software automatically.
I hope this helps, and if you have any further questions you can either
reply to this post or directly contact an Applications Engineer by
calling 1-866-ASK-MYNI.
Regards,
Travis Gorkin
Applicaitons Engineering
National Instruments
www.ni.com/support

Does the academic version of Labview 8.5 allow running AT MIO 16e-1 DAQ board?

I just bought the academic version of Labview 8.5. I have an AT MIO 16E-1 DAQ board. I have installed the Labview software. Then I installed the Legacy NiDAQ 7.4. I put in the board and MAX recognizes it. Windows detects the board twice. The first time is installs automatically. The second time there is an error.
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Thanks.

Hello Test11111,
In order to use Traditional NI-DAQ devices in LabVIEW you need to know the device number as given in the Measurement and Automation Explorer. Unlike the IMAQ or NI-DAQmx devices, Traditional NI-DAQ devices do not auto-populate in the channel controls or constants. The good news is that if the device shows up in MAX and the test panel works there then your device is working properly.
There are some Traditional NI-DAQ example VIs available through the NI Example Finder. To access these examples open LabVIEW and go to Help» Find Examples... Then in the top left select Directory Structure; the "daq" folder contains all of the Traditional NI-DAQ examples organized by device and function (analog, digital or counter I/O).
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Cheers,
Brooks

Not receiving any signal input with LabVIEW SE, USB DAQ board

Hello all, good afternoon.
I am having a little trouble with my DAQ device, I hope that someone will be able to help me.
I'm plugging a BNC pH sensor to a NI USB 6251 M-series board, to try and obtain the electrical response of that particular sensor, measuring the voltage output for each buffer solution (pH 4 and 7). Have 9.2.3 mx (lastest) drivers.
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In labview signal express, I choose to take an analog voltage read, and select input range from -500mv to 500mv, because the sensor should output at most -400mv to 400 mv
Now, much to my dismay labview registers in that channel absolutely nothing, only a little noise (~1 mV). I unplug the sensor and realise that whether the sensor is connected or not, it doesn't make a difference in the presented output - it's as if it the sensor wasn't there at all. And yes, I am measuring the correct channel. I tried connecting the wires to different AI channel pairs as well, could be a faulty one, but no success either.
If I plug a voltimeter to the wires that are going into the analog inputs (after conditioning), it measures about 50 mV, which is a lot more than the 1 mV the board is measuring, but a lot less than the ~180 mV I should be measuring with a pH 4 buffer solution.
I know for a fact the problem is not the sensor, and the DAQ board seems to be fully operational.
I think it might have to do with the signal conditioning I'm doing, or some sort of configuration with the hardware of the DAQ board.
So, any idea what I might be missing?
I'm a week behind schedule because of this, hopefully I will find my answer here.
Thank you very much in advance!

Good afternoon.
Yes I have tried all of that. The board responds very well when a flat 5V DC voltage is fed into a channel.
However after much investigation I believe to have found the problem yesterday, it probably has to do with the operational amplifiers I was using. The input bias current was in the magnitude of nanoAmps, while for pH measurements an IBC of picoAmps or less is necessary due to the high impedance of the sensor. This was causing a drift of over 100 mV on my output which is about 2 pH and thus unnacceptable (even though I had the Bias resistors at the input to ground, like suggested in the NI tutorials, but apparently they were not enough to compensate for the high IBC).
In the lab all available op-amps suffer from this, even Instrumentation op-amps like AMP04 from Analog Devices. I still haven't had a chance to acquire new op-amps with the necessary IBC but hopefully it will do the trick. Makes sense since I checked the datasheets for every op-amp in the lab, and they all had IBC around 400 nanoAmps (and none of them worked), while every single op-amp for every pH meter circuit I found have IBC's of pico/femtoAmps.
The sensor I'm using is from AquaMedic, I'm not sure what the model is, but it's a cheap plastic sensor that comes bundled with their pH Computers.
Thank you very much for your input.

3-Channel angular position measurement

Hi,
I have the PXI-6230 available in my PXI system. What I am trying to achieve is to read the outputs of a stepper motor driver and determine the corresponding angular position and direction (i.e.. like a stepper motor simulator). The driver outputs 3 pulse trains (3 coils). I am wondering if it is possible to use the counters on the PXI-6230 for this application? I've read some info on the M-Series Counter X1/X2/X4 Encoding for position measurements. But such methods require only 2 input channels A & B to detect the pulse counts and direction. Is there a workaround to apply this encoding method for my application? Any help/advise is greatly appreciated...

Dunno if there are new ways in newer DAQmx versions since I'm not near a machine I can double-check. Meanwhile,
I'll describe a way I've often handled it:
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2. I don't know of a method to "retrieve" the direction itself with a software query. You might need to remember (think "shift register") the previously queried position so you can figure out direction yourself after retrieving the current position.
3. Most of the time I read my counter values as u32 datatypes rather than as scaled floating point values. Kind of an old-school habit since I "grew up" under the older "traditional NI-DAQ" driver. However there's one little gotcha to look out for.
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-Kevin P

How can I acquire data in a PCI DAQ board using a SCXI rack?

Hello.
I have an acquisition system that consists in:
· 3 PCI DAQ boards:
- PCI-MIO-16-E-1
- PCI-6052-E
- PCI-6034-E
· 3 cables to connect PCI boards and SCXI modules
· 1 SCXI chassis:
- SCXI-1001
· SCXI modules + terminal blocks:
- 4x SCXI_1121 + SCXI_1320 (for voltage analog inputs)
- 1x SCXI_1520 + SCXI_1314 (for strain gauges)
- 1x SCXI_1530 (for accelerometers)
I have been trying to acquire different signals (specially voltage signals that are easier to reproduce) but I haven't been able to do it. I can't read anything from MAX or LabView. I have tested the PCI boards with a SCB68 terminal block (without any SCXI component) and they work properly. Problems appear when I use the SCXI chassis and the SCXI modules. I don't know if there is a problem with the hardware or it is a wrong configuration.
I guess channels in the SCXI modules correspond to analog input channels in the PCI board they are connected to, but I don't know if I have to read data from analog input channels of the PCI boards or from SCXI channels that appear in MAX (I have tried both posibilities, but they don't seem to work).
I don't know if I have to use Differential, RSE or NRSE configuration. I have tried all of them. Sometimes I only read noise, sometimes signal is fixed in a limit value (maximum or minimum, it depends), sometimes it's fixed in a value near zero,... I have changed connections and configuration options so many times I can't exactly say when one thing or another happens.
I have tested only one PCI board with only a SCXI module in order to avoid interaction and confusion. Nothing.
I think I have tried changing almost every option in MAX, but it doesn't work.
I'm sure I'm missing something and solution is quite simple, but I can't find it.
Can anybody explain to me how to connect and configure my system to read any signal? I only need a few steps or highlights. Maybe some clues about what the problem can be.
Thanks!

I have several comments and suggestions:
A) Have you "added a device" in MAX and actually added the SCXI chassis? This step is necessary to get the chassis to work. Click on "add a device" and choose the 1001 chassis . Do this for one DAQ card and one module only initially. The Set Up wizard should walk you through the configuration. If you are unable to add a chassis within MAX, I suspect the chassis is not working correctly.
B) Once configured, you can examine the SCXI channels in MAX as follows:
1) Open the DAQ card in MAX and Open the Test Panels
2) For the SCXI channel to view, use the following convention OB0!sc(n)!md(m)!ch where the letter (n) corresponds to the chassis number in MAX (usually = 1), the letter (m) corresponds to the module number (slot) where the module is located in the chassis, and (ch) represents the channel(or channels) you wish to view. So presuming chassis ID=1, and a module in slot 1, and you wish to view channel 3, you would type the following in the channel field for the DAQ card channel to view:
OB0!sc1!md1!3 (note OB0!sc1!md1!3:6 will display channels 3 through 6)
All of the SCXI channels for a given DAQ card are multiplexed through channel 0 of the DAQ card, Channels 1 and up are not used, hence the initial three characters in the SCXI call refer to "On-Board Channel 0 (OB0)"
C) For the subsequent set up, it will be necessary to first add the additional modules to the chassis (when powered off). Then open MAX and update the chassis. (If you get an error then simply delete the chassis reference in MAX and add a new chassis). You will then be required to set the interface mode of each module as either parallel or multiplexed. In parallel mode, you associate a distinct module with a distinct DAQ card in the host PC. For those DAQ cards that will address multiple modules, you must first configure the modules to be in adjacent slots in the chassis and then assign the first module to the cabled DAQ card - then all of the modules assigned to that DAQ card should be configured in "multiplexed" mode.
D) Once the chassis has been properly configured, you can click on each module and set the gains, filters, and terminal block types.
I hope that this helps to get you started.

Connecting more than one sensor cable to screw terminal to collect more than one signal in single DAQ board channel?

I don't know if this topic is being posted in the correct location. I am new to LabVIEW and the hardware associated with it. I am using an NI 9237 DAQ board for a senior design project in engineering and I was informed that I can make multiple connections to a single screw terminal which in turn will connect to one channel of the DAQ board. To give the specifics, I have two pressure transducers and would like to connect them to the same screw terminal and channel on the DAQ board yet separate them when acquiring data in the VI. Does anyone know how to do this? I know is is essentially knowing what pins do what on the screw terminal but I can't find this anywhere. I am currently doing the job with two screw terminals and two of everything else (RJ50 adapters, etc.). I would appreciate any input. Also, please let me know if I am posting in the wrong board and if possible, which board I should be posting to.
Thank You,
bsteinma

bsteinma,
What you may have heard is that you can measure multiple signals on the same task, not on the same channel. By tying both of these signals to the same channel, both signals will compete to drive the line. The channel on the card will only interpret this garbled signal and you will get no useful data. If you are new to wiring up hardware, I recommend configuring a task within Measurement and Automation Explorer and then clicking on the tab along the bottom of the page titled, Connection Diagram. This will show you what electrical connections to make. Then, in LabVIEW you can read multiple signals (channels) and manipulate each signal how you would like.
As far as boards go, you will generally find an answer where ever you post, but the Multifunction DAQ board is a great place to post when you have questions regarding hardware (like your 9237).
Cole R
Applications Engineer
ColeR
Field Engineer

How to find the position of view in MM02 transaction for coding BDC?

Hi Guys,
Is there any FM or BAPI Available to find the position of the view in MM02 transaction. I tried FM SELECTION_VIEWS_FIND. But getting inconsistent results
i.e Some materials it is giving correct positions but for others i am getting wrong position. So my BDC is getting failed.
Thanks in advance.
Vinod.

Hi,
data : i_t133a like t133a occurs 0 with header line,
      ch(1),
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clear viewno.
select * from t133a into corresponding fields of table i_t133a
                where bilds = '21' and guifu like 'SP%' .
loop at i_t133a .
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      delete i_t133a     .
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endloop.
sort i_t133a by guifu ascending .
loop at i_t133a .
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How to play a wave file through the DAQ board?

Hi there,
we want to play a wave file that is saved on the harddrive via the DAQ board. Means we want to connect a amp to the analog output of the DAQ to amplify the sound and play it through a speaker.
We couldn't find any VI that does that. Can anybody tell us how to play a wave file, or perhaps even send us a VI that can do that?
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Martin - Physical Optics Corporation

Hi Martin,
The only example that I could find on how to do this was using our
older Traditional DAQ drivers version 6.9.3. If you're using Traditional
DAQ drivers, the vi can be found here.
The example reads a 8-bit mono .wav file (an example .wav file is included in the .zip file) and writes it to the analog out of your DAQ card. I've updated the
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I hope this helps,
Paul C.
Message Edited by Paul C. on 08-14-2007 05:47 PM
Attachments:
daqmx_wav_file_to_ao_output.zip ‏27 KB

DAQ Assistant in subvi not updating output to DAQ board with each call...

Hi All,
I am calling a simple subvi that creates a user-defined number of pulses with "Square Waveform.vi." This square wave (with the given total number of pulses) is then used as an input to a DAQ Assistant controlling an analog output signal on a NI USB-6259 DAQ board. I am using Labview 8.5 right now.
However, each time I call this subvi from my main program, the output I measure from the DAQ board is identical to whatever I set in the first call (i.e., if i created two pulses in the first call, I get two pulses on every call, regardless of the input I feed to the subvi). The multiple calls to this subvi are made in sequential frames in a stacked sequence. I believe stacked sequences are frowned upon by good labview people, right? But putting that aside for the moment...
The "#-of-pulses" input I give to the subvi is updated in a subvi front panel number indicator and a graph of this waveform. Just not in the real output I measure from the board. Why is the hardware output being asserted (with the original input value) before this new number can reach the DAQ Assistant?
The sloppy fix to this is just to put that square wave creation code in my main program each time I need it. This does work and fixes my problem. However, I would like to use subvis to keep things clean.
I am not a good Labview programmer, but have used this software for a number of projects and am stumped by this. Any ideas?
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Hi John,
I am running your code over here and seeing
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This is intended to improve loop speed for when customers are
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It sounds
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timing is set to Use
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Thank you for pointing out this odd
behavior--out of curiosity which version of DAQmx are you using?
-John
John Passiak

Need help in finding the position of a SubString in a String

Hi All,
I have a VARCHAR2 column in my table which has data similar to '152-425-3265-8-5623-45'.
I want to find the position of the numbers in the column.
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Thanks in advance.
Edited by: 868171 on Jun 24, 2011 4:33 AM
Edited by: 868171 on Jun 24, 2011 4:34 AM

do you know the max number of dashes?
if so
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from t
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select code, num, regexp_count(regexp_substr(code,'^.*'||num||'.'),'-')
from tEdited by: pollywog on Jun 24, 2011 7:55 AM

Interfacing LabView compatible DAQ board w/ third party DAQ boards

Dear NI-team and board-members,
In my current project I'm using a third party Direct Digital Controller which supports customizable Programmable Logic Control (PLC) via a graphical programming software. Therefore, I'm acquisitioning temperatures (etc.) from my miniature-HVAC application via physically attached and mounted sensors, connect them to a dedictaed analog input (0-10VDC typically) and in further assign the analog input to some selected PLC modules with the help of the graphical programming software, and finally after doing the computation (calculator block) or control (Proportional-Integral-Derivative block) I assign the resulting control signal to a dedicated analog output (typically 0-10VDC as well).
So far for the previous history, NOW I actually want to be able, to manipulate these analog values in a way, that I'm not interested in the physical acquisitioned value from my real-time operating equipment (e.g. temperature sensors), more than that, I'm interested in assigning a certain level (e.g. +5 VDC) to that dedicated analog input, which in turn would represent a temperature e.g. in this simple case (+5VDC) 50degF.
Now to the questions, can I possibly interface the physical ANALOG INPUT (0-10VDC) of my third party DDC unit, with the ANALOG OUTPUTS (0-10VDC) of a NI DAQ board? In that way, I'd be able and with some additional help of LabView to program time intervals, where I raise the voltage level every 5 minutes by 1VDC, and in turn can proceed with my intended purpose.
To sum that up, are there physical limitations (e.g. ground loops, damage equipment, shorting) connecting an analog output of one board, to the analog input of another board?
Also, which DAQ of NI might be best suited for my intended purpose, using a NI DAQ board for "simulating" temperature values (etc.) onto the analog inputs of another third party board.
Thank you,
Sandro

Hi Sandro,
If both boards are in the same computer I wouldn't be too worried about ground loops or damaging equipment. The ground reference to the AO board will be the same ground reference as the computer and AI board. You would have to check with the specs for your third party AI board to see what overvoltage protection it has and whether or not our AO board could give a voltage high enough to damage it.
I would suggest one of our AO boards to do the job. Depending on what kind of control and precision you want, we have static update boards available in PCI form. The static board will be cheaper but you are limited to software timed voltage updates (instead of clocked buffered waveform output).
http://sine.ni.com/apps/we/nioc.vp?cid=12550〈=US
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Recovering DAQ Board channel lists from a program in LabView 2

I am working on updating a LabView program that was written in LabView 2 or even possibly earlier. I got the conversion CD and upgraded the program so I could open it on LabView 6.1. Unfortunately, in the process of this upgrade, all information regarding the access to the lines of the board was lost. At the time it was last used, it accessed a Multifunction I/O Board for Macintosh Nu-Bus, Part Number 320174B-01 and was using a Macintosh IIci computer. I have a new DAQ board, the NI-PCI-6221 that is in a new Dell workstation, running Windows 2000 and LabView 6.1. I was wondering if there is a way to recover the channel lists that should be in the subVis. Do I need to track down a copy of LabView 2 or 1 to do so? This conversion also involved a Macintosh to PC switch, which if I understand correctly is a problem in the earlier versions of LabView? I was hoping to find the best way to recover this information, so I can properly adjust the program and configure it to my new DAQ board. Thank you.
Kathleen

Hello again, and thank you for all of your help thus far. I'm trying to obtain information on the access to the lines of a DAQ board in a program that was written on a Macintosh IIci in LabView 2 (The program and some of the created subVIs are attached). I was hoping someone may have access to LabView 2 and an old Macintosh that could run this. If the program opens I'd like to see snapshots of the screen for the DAQ subVIs. This would help me greatly in what I am trying to do. Thank you.
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Attachments:
Archive.zip ‏167 KB

Selection of daq board to find angular position of 6 motors using encoder

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