Re: A baffling File delete problem under LV 6.1 - solution
Well, it turns out that my strange LabVIEW 6.1 bug where I couldn't delete a file created by a dynamically launched VI until all VIs stopped running was due entirely to a corrupted VI. For those who saw my post 2 days ago (and care), I used an older version of my Acquire.vi and re-did the exact same changes I had made since the old version and everything worked fine. Still, very strange behavior. Oh well. As the Bard once to so aptly put: All's well that ends well... -E. Blasberg iDAQ Solutions Ltd
Re: seperate window example
I do not get along with the data socket server. When I cklick right on the control panel I can take a data socket connection. But then? I cklick on public and then in the upper right search. And then there is Browse Measurement data and Browse file system. What will i have to do? take browse file system and then the path to the subvi?
PID values during autotuning
To start the autotuning process using labview PID tool kit what should be the initial value of P,I and D? And also does the tuning duration required depends on initial P,I and D values?
Detect Motion in Camera-Images
Hello G-Community :-)) I've had the chance to gain some expirience with programming in LabView. But now I have to solve a Problem in a field that's completeley new for me (i really love this job, something new everytime). I have a Camaera from which I grab an Image every second (with single-image acquisition I could got up to 10 per Second, but that's not necessairy). I'm savint every 60th Image. The Camera points to a cage where rats are livin in. Now I want to save the Images at a higher rate, when movement is detected in the Image. At the moment I'm just substracting the last image from the actual one (funny to look at the resultign pics). I'm looking at the mean value of the result of the substraction, which seems to be a good indicator of changes. The Problem is now, that the mean also rises, when the ambient light changes. To lower this effect I thought about just substracting the linear value from the (quadratic) mean. Would this be a way? Are there functions exactly for this in IMAQ eventually? (I have LabView 6i and IMAQ 6.0). Thank you and bye Marco
RE: join synchronization methods
SPRINTER [EMAIL PROTECTED] wrote: May be someone knows the way to join different synchronization methods ? In other words I would like to use the queue and occurence with one while loop. Desired effect is that while loop waits for one of these events (element in queue or occurence). In my case, dequeue function was being blocked by the wait occurence function. Event controlled objects in a data flow language will have to wait for both objects to return before the code can continue. Not much to change about that. You have two options. 1) Separate those two in different loops. Let them do whatever they need to do. Eventually communicate the event from one loop (occurrence) to the other loop (queue) if the code to perform for the occurrence is the same as for one of your queue events. 2) Even better: instead of using an occurrence generate directly the according queue command element in the place you would normally trigger the occurrence. Or add a specific dummy occur queue command to send to the queue from where you want to trigger the occurrence. Queues really are just very sophisticated occurrences with queueing of the events as well as data storage with each event. So there is no problem in using a queue as an occurrence at all here other than the queue being a little more expensive in resource terms but as it is there already anyhow you really loose nothing. Rolf Kalbermatter CIT Engineering Nederland BVtel: +31 (070) 415 9190 Treubstraat 7H fax: +31 (070) 415 9191 2288 EG Rijswijkhttp://www.citengineering.com Netherlands mailto:[EMAIL PROTECTED]
Re: Waveform graph legend
[EMAIL PROTECTED] wrote: I have waveform graph of 48 plots. The first 16 plots are the actual data. The last 32 plots are the upper and lower limits for the first 16 plots. I have the legend visible and only expanded to for the actual data (first 16 plots). So there are only 16 plots in the legend. If the color one of the plots in the legend changes the color of the limits needs to change accordingly. I do this by using a property node (set active plot, plot color). But since legend is not expanded to include the limits an error 1077 Invalid property type is given. If all 48 plots are included in the legend I do not get the error. However I would prefer to not display all 48 plots in the legend. Has anyone else seen this? What are some ways to work around this? The legend or the plots defines what plot channels are available. So if you want to be able to change plot attributes you need to either make sure there is according data for that plot or the legend is expanded to show that channel. It is as simple as writing a single NaN value for each channel you want to be able to change plot attributes for. Rolf Kalbermatter CIT Engineering Nederland BVtel: +31 (070) 415 9190 Treubstraat 7H fax: +31 (070) 415 9191 2288 EG Rijswijkhttp://www.citengineering.com Netherlands mailto:[EMAIL PROTECTED]
Re: [W] Data link Serial port
R. Glenn Givens [EMAIL PROTECTED] said: Fortunately, I don't have to worry about the funny protocol bad documentation because I get to decide all this myself. This being the case, my top tips would be: - Have the remote device send a data block in response to a query from the PC, rather than spewing out the data continuously. The only serial communication task in LabVIEW that's ever given me a real headache was dealing with a meter that sent continuously, and I never completely fixed the intermittent error that would occasionally pop up and halt a three-hour test. The query-response format is far more predictable to deal with: you don't have to worry about data piling up in the buffer, chopping messages in half by reading/flushing at the wrong time, etc etc. - Make use of VISA's termination character feature: have the remote device append a unique character such as LF to the end of each message it sends, wire a number bigger than the message length to 'bytes to read', and VISA Read will just return the message up to and including the termination character - or time out if it didn't arrive. No need for flaky time delays or polling the number of bytes at the port! If your current VISA version is less than 3.0.1, it might be worth upgrading - search the NI site for visa 3.0.1 (with the quotes) to find the installer. Good luck, and once you're converted to the VISA way feel free to evangelise! ;-) Tom Dr Tom Hawkins High Throughput Screening Analyst, Associated Octel ltd PO Box 17, Ellesmere Port, Cheshire CH65 4HF, UK +44 (0)151 355 3611 [EMAIL PROTECTED] - Email provided by http://www.ntlhome.com/
How do you convert labwindows programs to labview programs?
Is it possible to convert a labWindows/CVI developed program into a LabView program?
How can I obtain a reference to a global variable?
I wish to change the contents of the columns in a global multicolumn listbox. As far as I can see, the only way to access the columns in a multicolumn listbox is to create a reference to it and access the ItemNames property. But how can I create a reference to a to a global variable?
Re: Use default if unwired buggy?
Hello Oliver, As you mentioned that you have case with several outputs, there might be one or more output for which you have not enabled use Default if unwired option. This happens incase your wiring arrangement is not proper i.e. improper alignment, arrangement or clumsy. Just check thoroughly by putting the proper alignment of all the output wires. Hope this helps. Your feedbacks are welcome. Best Regards, Nirmal Sharma
Re: HELP!!!What is TIME LIMIT parameter in triggered acquisition???
Hi, I think, try giving -1 to Time limit parameter in AI read Vi or give the maximum time limit not to occur the time out operation. See the example program at below mentioned path in your computer: C:\Program Files\National Instruments\LabVIEW 7.0\examples\DAQ\anlogin\anlogin.llb\Cont AcqGraph (buffered) Hard A-Trig.vi. If u r not able to find, open LV-goto Find examples- Hardware Input and Output - Traditional DAQ - Analog Input - General - Cont Acq Graph (Buffered) Hard A-Trig.vi. Hope this helps. Your feedbacks are welcome. Best Regards, Nirmal Sharma
Re: How can I obtain a reference to a global variable?
Hi, For changing the contents of any gloabal variable, you have to access that global variable in a normal vi. Open a new vi, go to Block diagram - Function Pallete-Structure- Global variable. Then right click on this global variable- replace by your global variable vi or create a new global variable vi. By doing this, u can access the value and can change it. Hope it helps. Your feedbacks are welcome. Best Regards, Nirmal Sharma
Re: Calculating statistics from an array with intervals
Victrick, I am sorry to create so much fuzz, hopefully my explanation below is better to understand. So I hope you can help me. Your understanding so far is correct: =93Every time an element in the first column satisfies some value, it corresponding value in the second column is set aside in an array to be used later.=94 The original array contains two columns; the first column contains a time stamp, the second column the actual measurement. I want to split this array into portions based on the values of the first column. Initial it should check if the value in the first column starting at index 0 satisfies condition X and put the corresponding value from the second column in a split array, it should continue (continuing from index 1,2,=85,n) to do so until the value from the first column does not satisfy condition 1 anymore. Then it should calculate some statistics over the split array (summation, number of samples, etc). After this the process should begin all over again starting to check if the value from the first column (starting at index n + 1) satisfies condition X +1 , and so on until there are no more values in the first column. I managed to create a VI (attached to first post) that does all of the above without any problem as long as for all subsequent conditions at least one satisfying value from the first column can be found. E.g if for condition 10 no satisfying value from the first column can be found the first value from the next condition (in this case 11) is considered to belong to condition 10 and from that value the statistics are calculated. Instead it should consider that for condition 10 the value from the second column is 0.
Re: The Future of Igor and Info-LabVIEW Lists
Thank you very much, Tom. It has been a wonderful run. -k
Re: switching of analog measurment signals
Hi Johannes, why do u require switcher??. As u mentioned u are using the optocoupler which will take digital TTL o/p from DAQ card switch the respective analog channel, you dont require any other switcher. Also switching 100 mV through TTL outputs should not be any problem. Hope it works. Your feedbacks are welcome. Best Regards, Nirmal Sharma
Re: How can I obtain a reference to a global variable?
Thank you for your answer. I know how to use global variables in general, but the problem is that a Multicolumn Listbox (MCL) referred as a global is just the number of the selected line(s). I would like to access the icontents/i of the MCL, which I perceive as a table. If this is a MCL in a normal VI, I can create a reference (and by this I mean a reference, not a local variable), and use a property node to access the ItemNames property, which gives me the contents of the table (I could of course also have created the property node directly, but the reference can be passed to subVIs). However, if the MCL is a global variable, it is unclear how I can create a reference or property node to access the contents. Is this impossible, or is there something that I overlooked? Martin
USB Labview
Hello, I would like to communicate with a USB device via Labview. Please, can you give me a exemple of communication (between USB Device and Labview) and how I can install USB devices in MAX(Measurement Automation eXplorer) Thanks very Johan
convertir un rapport Html en rapport texte
convertir un rapport Html en rapport texte
can I use any simple VabView7 code vi in ver 5 labview?
can I use any simple VabView7 code vi in ver 5 labview?
Re: How do you convert labwindows programs to labview programs?
No. Maybe once NI releases the LabVIEW scripting tools, someone will create such a tool but for now, the only thing you can do is create a DLL from the CVI code and use the Call Library Function Node. This is done all the time with CVI/IVI instrument driver and there is a tool to do this type of conversion.
Re: socket programming
thanks
Intergration of Sine wave without constant added
I am inputting a positve /negative sine wave and I want to find the integral of the wave. When I integrate it becomes all positive. I know this is because of the integration constant being added. Is there a VI out there that integrates purely scientifically and gives the output in terms of positve negative. That is to say I wasnt to be able to integrate an acceleration signal to give velocity and displacement without addition of the constant in the Integral x(t)vi. that offsets the waves.
How can i see if a exe is running?
I need to see the termination of a running program to restart my Labview application. The Program was started from my Labview program.
Transfer and coherence function with Labview.
Please send me a Labview code with transfer function (gain vs frequency) and coherence function of 2 signals: stimulus signal (1024 pts) and response signal (1024 pts). Thanks.
Re: seperate window example
this is where you put the path to the main VI. like this dstp://localhost/mainvi. where MainVI is the name of your application that is calling the subvi. you must start this path with dstp.
Re: Vi's text file..editing?
Shan [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED]... Can you provide more information on what you are trying to do? What do you mean by a VI's text file -- a text file of data generated by a vi? Or do you mean something akin to the equavilent line code of a block diagram? If your looking for line code, it doesn't exist. Tim The equavilent line code of a block diagram ... Edit that ..re-save it ...and run the VI.. If I display an HPVEE program as a text file... Modify the line code in Word (Much quicker that going to the Block Diagram and making alot of changes..)...If it's alot of the same changes in a big program (VI..in our case).. ( 1MB)..lets say.. Thanks Chris
Re: Inverse FFT's
You are right, there is a problem. The problem is caused by a bug in the FFT VI in LabVIEW 6.1. It does not compute correctly when the number of input samples is a big prime number (in your case 59981 samples). The work around is to add a dummy sample at the end of your time signal before you perform the FFT and remove that last sample at the output of the IFFT.
Re: Inverse FFT's
That solved the problem. It was just a coincidences that the number of data points was a prime. Adding another data point resolved the problem. Thanks
Re: Inverse FFT's
imaking my real set of data complex by adding an imaginary part equal to zero./i Not sure why you're doing that instead of usinig REAL FFT and INVERSE REAL FFT. Are you sure you're generating the imaginary array the same length as the real array?
Re: switching of analog measurment signals
Hello Johannes, It sounds like you're setting up a system that requires four analog inputs (two voltage and two current), and you would like to use an analog trigger to switch between which signals are measured. There are several options of how you can set up such a system. In terms of measuring the four analog inputs, you should be able to do this with a DAQ card alone. Many of our cards, including the AT-MIO-16E-10 (also called a 6020E), have 16 analog input channels that have an input range of +/-10V. I'm not sure exactly what you meant when you said that the 6020E isn't sufficient for measuring your analog inputs, but if you clarify that, we may be able to find a way use a DAQ card alone. As for the analog triggering, the 6020E only has digital triggers, so you are right in saying that you can't do the digital triggering with that card. Most of the other full featured E Series cards (ex. 6030E, 6031E,...) do have analog triggers, so depending on the type of triggering you'd like to do, you could potentially use a DAQ card. This leaves us with several options for the final system: 1. You could upgrade to a better DAQ card that has analog triggering capabilities. This is contingent on what you meant by not being able to do the analog measurement on the 6020E. 2. You could use the 6020E in conjunction with a relay device to switch signals on the Keithley instrument. You can find available national instruments relay devices in the digital signal conditioning accessories section of the NI catalogue. While this is certainly a viable solution, I don't think it would make best use of your tools. One thing that I'm confused about is why you have to have analog triggered signals. Would it be possible to use digital triggers? If so, then you could use the 6020E alone. Regardless of which system you decide to implement, you should be able to use LabVIEW to interface with the hardware. Hope this helps! Marcus G. National Instruments
Re: Inverse FFT's
I just ran your problem waveform through REAL FFT and INVERSE REAL FFT, subtracted the difference and got an error of 7 e-11 on the DC term, and all other errors are on the order of e-14. LabVIEW 7 Mac OS X
Enum as drop-down box
Hi all, First a little history: I am using an Enum as a drop-down box in a user-interface on a touch screen computer. There is no mouse or keyboard used. There are around seven items in the enum, and when the user 'clicks' (touches) the enum box, the list opens up and displays all of its contents. When the user selects, say, the fourth item, the drop down list disapears and the fourth item is diplayed in the box. Now when the user touches the box again, the list drops-down, the fourth item is highlighted, the third item is displayed above it, but you have to scroll up to see items 1 2. Now the question: Is there a way to have the list, when clicked, always display the entire list, no matter what item was previously chosen? (i.e no scroll up arrow)? It is very difficult to navigate the scroll arrow with a finger unless the font is very large. To see what I mean, create an enum with several items in it, and place it at the very top of the screen. Thanks in advance! Eric Scott
Re: multiple strings and case structure
Hi, It looks as though you want to parse the data 1 and use part of the string to index a case statement, then pass the value to it. Did you really want to have multiple data with special index in each? Or do you have four (4) active data strings and you want to send the data to the appropriate case? An easy way is to truncate the first 2 or three letters and feed it to the case structure. I would recommend having a default case, typically 0. The identifiers within the case would simply be those first 2 or 3 characters. In the situation where you have multiple entires, such as Data1... Data4, then, you may have to put them into a loop (while?) and manipulate them in the manner that you want before sending it to the case statements... In this situation, you would need multiple Case Statements, one for each Datax... but this is unlikely, right? Let us know more details of how you want the data to be evaluated, is it inparallel, or could you use a single DATA and type in any of the selections, and so on.. Regards, JLV
Re: How can i see if a exe is running?
Sorry for answering a question with a question... How are you running your program? Are you using System Exec.vi? If so, you can set the wait until completion to true and feed the output error cluster to some sort of indicator. Usually, some programs will return a value, especially an error code. This can be used as an automatic way to indicate that the program terminated and may even indicate if it completed successfully or not. Can you provide more details of what type of program is running and how it is executed? Thanks, JLV
Loading *.llb first loads to folder view
When I first load a llb file it doesn=92t go directly to the top level vi. What I get is windows explorer view with all the sub routines which then I have to select the appropriate top level vi. I was able to load directly by setting the top vi in Labview 6.1 but I don=92t seem to be able to find a solution for labview 7.0 Cheers, Mark
Re: How can i see if a exe is running?
Seit wann programmiert Hans S=F6llner?
Re: Why does a strictly Typed Control cause error 1082
Hello, I think a similar issue has already been reported to our Research and Development department, and they are currently working on it. Could you post your code so that I can make sure this is the same issue that has been reported? I can also take a look at your code and see if I can find a workaround for you. The important thing here is to have the Main VI, the sub VI and the strictly typedef=92ed control. Thanks, Ken S. National Instruments
Re: LabVIEW PDA
Hi AK, Here are the answers to your questions: 1. The execution target you choose depends on where you want the VI's to run. If you want them to execute on your computer, then choose Windows as your target, and if you want the VI's to execute on the PDA, then chose that as the target. More informtion about this is available in chapter 4: Building PDA VIs in the manual that you found and linked to this post. 2. There is no workaround for these VI's. They are not supported by LV PDA mostly due to the hardware limitations of processing on a PDA. 3. LabVIEW PDA is only compatible with LV Express, version 7.0 and higher. Thanks for contacting NI! Marcus G. National Instruments
2D Interpolation of Irregular Grid Data
I have 2D data of f(x,y) at irregular grid points and I wanted to do some interpolation so as to get this data on a regular(and denser) grid, so that I can further manipulate it with available packages. Is anyone aware of any package/software/code that can help me do this. (i.e. the mathematica and matlab functions only work with regular grids) Thanks for the help.
Re: interrupt timer driven
Hello Kai, Unfortunately we aren=92t able to support other manufacturer=92s data acquisition cards. Interfacing to an interrupt on your Wasco card really depends on the driver and programming interface that was created by the card=92s manufacturer. National Instrument's data acquisition cards include a driver called NI-DAQ which installs the card drivers, VIs to interface to the card from LabVIEW, and example programs to do many common measurement tasks. I can give you a general idea of how to access your DIO card. First you would need to install drivers and any development tools that are included with the card. Next you would need to determine from the manufacturer=92s documentation how to access the interrupt. After that you can either call VIs directly (if the VIs were provided by a manufacturer), or you can make calls to a DLL (which would also need to be supplied by the manufacturer). The DLL functions can be called by using a =93Call Library Function Node=94. This VI is located on your Function Palette at the following location: =93All Functions Advanced=94. If you need any other help or clarification, please let me know. Have a great day! Ken S. National Instruments
Re: simple image processing sample vi ?
Especially if you own IMAQ Vision there are a lot of examples you can find at http://zone.ni.com/devzone/devzone.nsf/webcategories/7D6146D8C67A832E862567F1006C29EE?opendocumentnode=DZ52422_US Hope that helps ... Michael
Re: Loading *.llb first loads to folder view
You've have turned on Enable Windows Explorer for LLB Files. This setting is on the OptionsNew and Changed in 7.0 or OptionsMiscellaneous page. Uncheck it and restart Windows to get the old behavior.
Re: How can I obtain a reference to a global variable?
Hint: an excellent answer provided with a working example certainly worths a ! (it's four stars rating... not censored =A6=AC) It may not be the solution you expected but it is not the poster's fault after all...
Viewing processor utilization within the application?
I need to view the processor utiliation from within my application. Is there a call I can make to the operating system or does LabVIEW have the capability to do it? Thanks in advance.
Re: How to input a 64 -bit word ???
LabVIEW can only handle unsigned integers up to 32 bits. Therefore, you need to split the 64 bit word into a 32 bit hi word and a 32 bit lo word. For the 24 bit word, use a 32 bit unsigned integer and ignore the top 8 bits or split it into an 8 bit hi word and a 16 bit lo word. If you attach a vi explaining exactly what you are trying to do, I may be able to help more. Dave.
Re: exemple de VI pour commander un appareil USB
This links could help you: http://zone.ni.com/devzone/conceptd.nsf/webmain/67E175B2AF9AA10286256A9D0078E2E7?opendocument http://zone.ni.com/devzone/conceptd.nsf/webmain/6792BAB18242082786256DD7006B6416?opendocument http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/42b604435e3f9604862565e20043cd30?OpenDocument
Re: multiple strings and case structure
Thank you for the response, but I was wondering how I would do it for the other sets of data. That is, I have data 2 and diag info 2 and so on.. Does that mean I have to have individual cases for each set of strings or can I wire more than one set of strings to the same string? Thanks in advance.
Re: LabVIEW PDA
Thanks Marcus for your help.
RE: AnalogOutputs info
Richard You need to set the number of buffer iterations to 0 in AO Start.vi to get it to generate the buffer continuously until you clear the generation.. Dan Bookwalter N8DCJ Hi-Stat a Stoneridge Co. 345 South Mill St. Lexington, Ohio 44904 (419) 884-1219 Phone (419) 884-4172 Direct (419) 884-4195 Fax [EMAIL PROTECTED] -Original Message- From: Mahoney, Richard C [mailto:[EMAIL PROTECTED] Sent: Thursday, March 25, 2004 1:43 PM To: [EMAIL PROTECTED] Subject: AnalogOutputs info I'm not really new to LV but I've always used Commercial Function Gens, and I know that I can use an MIO Bd. I'm trying to load a buffer with a sinewave (1.5Khz) and run the VI and get out a wave form. Most of the example programs show how to do this. But I want to just run the VI, let it complete, and then move on. But when I stop writing the output, the signal goes away. Isn't there a way to load the buffer (circular Buffer) on the MIO bd and let the HW take over and just keep outputting until I run a Stop analog output VI? I know I can just run the output code in parallel with the other code I'd like to execute, but, I'm thinking I should be able to let the HW just do this. I'm relatively sure there is a way, but the solution escapes me. Has anyone have info on this or have this type of code they would be willing to share? Also, What is the highest output Frequency with pretty good resolution I could possibly expect from this type of a config? I am using a PCI 6070E E series PCI bd. in a Win2k setup. Thanks in advance Rick _ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to [EMAIL PROTECTED]
Are there any good ActiveX samples calling into WMI?
Greeting LabVIEW citizens. I am a LabVIEW 4.1/5.1 expert who sadly hasn't touched LV in two years. I'm trying to get my head around LabVIEW 6 and, for the first time ever, learn how to call into ActiveX objects. I'm specifically trying to call into Microsoft's WMI Scripting Host Object to get at performance metrics (memory, CPU, disk, etc.) of my Windows box itself. I have several VBScript examples of how to load and use the WMI Scripting Host Object, but I'm having a devil of a time figuring out how to layout the ActiveX Invoke and Property nodes in an equivalent manner. Has anyone ever tried this before? Does anyone have example VIs that invoke the WMI objects? The docs on WMI that I have are pretty thin. You wisdom is appreciated.
Can you set samples per trigger for sound vi?
Hi, I've been looking at both Matlab and LabVIEW for acquiring sound through a PC sound card. In Matlab you can change the sampling rate (8000, 11025, etc), the buffer size and the samples per trigger. In LabVIEW I noticed you can only change the first two using the SI VIs. How would I go about changing the samples per trigger?
Clearing a local variable after each read
I want clear the value of a local variable(in this case a string) right after it's read. In this case the local is reading an indicator that's in another part of the VI.Can anyone help. Thanks in advance. S
Re: RS 485
RS485 is used by thousands of different units. Normally it will look just like a standard serial port to the application and you can use the serial VIs to communicate. The scan for device, acknowledge etc. that you describe is not part of the RS485 standard, it must be something specific for the device you have. What type of device are we talking about?
Re: Viewing processor utilization within the application?
If you have LV7 and have installed the .Net framework there is an example included with LV called SimpleTaskMonitor.vi, it does just that - using .Net
Re: USB Labview
This is a good starting point. Take a look it may answer this question and others that may come up later. http://zone.ni.com/devzone/conceptd.nsf/webmain/6792BAB18242082786256DD7006B6416?opendocument
Re: Clearing a local variable after each read
The VI is generating a polling command for multiple 485 devices. The responses are received via TCP/IP. The receive WHILE loop continuously listens fro the responses. Using a LOCAL is the only to get the responses out of the loop while they're being received. Thanks for the help. Now I have to figure out how to get an empty string to the indicator between responses. S
Re: Clearing a local variable after each read
Clearing a local is the same as writing an empty string to the indicator (or another local of it in write mode). Use data flow (may need the help of a single-frame sequence e.g.) to ensure that you have read the local before you write an empty string using another local... If you have an indicator there must be a value going to it, most likely from a wire. Why do you use a local to read the value of the indicator instead of wiring the value to whereever you need it?
Programmatically Raising a Mousedown or key down event
How can I raise an event pretaining to a listbox such as mousedown or keydown in LabVIEW 7? I read that something like this is possible but I am struggling to find an example
How can i add more terminals to a SubVi without compiling it again?
I usually create Subvi's in my programs but sometimes i need add more inputs to my subvis but i need to make a new subvi to make that imput available in the subvi icon, is there other way to do this?
DAQ Configuration problems in LabView: Error message -10401 AI Group Config
I recently installed LabView 6.1, NI-DAQ 7.1, and my A/D board PCI-MIO-16E-4. Everything went smoothly, but every time I try to run a VI, I am greeted with Error -10401 occurred and AI Group Config. I have tried every different combination of configurations I can think of, but I can't shake the error message. Can someone please help?
Re: how do you split the output of a waveform chart into seperate channels
I have LV 6.0.1 do you happen to have the program in that version? If not could you attach a picture of the LV 6.1 program as a word document? Thank you.
Re: How can i add more terminals to a SubVi without compiling it again?
To add more terminals to a vi, right click on the vi icon in the top right corner. Click on Show Connector. Right click again on the connector icon. The list of actions contains Add Terminal, Remove Terminal, Patterns, etc... You can choose either Add Terminal or Patterns to add one or more terminals. Assign your control/indicator by clicking on the newly created terminal and then clicking on the control/indicator you want to connect.
Re: dinamically reading load cell
My initial reaction to looking at the data is 1) It is undersampled 2) Why are the synce pulses different amplitudes 3) The raw data contains little or no information It appears, although not clear from your comment, that there was an existing system which weighed the trays. If this is the case what I would do is connect in parallel and record the data. I would send say 100 sets of trays through with known weights in. Say 10 with minimal and 10 with maximal and so on. Then keep a note of what you sent and when. Now you have a representative data set to create a logged file at say 44100Hz sampling rate and use that as a reference or perhaps use the WAV recorder to create a simple raw record. Most importantly it has no processing at this stage. You can then use this to refine your processing technique. Later in the projects life it acts as a system validation check. Some of the ones I have created are the most important parts of the projects I have worked on. From damage limitation (that's what the customer was actually doing when I was called in). To, 'I can prove you have changed something'. To 'Ops missed that!' In summary == I would suggest at this point you don't appear to have valid data. Wether that's a result of hardware or undersampling is impossible to say with the amount of information here. Put some 'calibration' weights on and make sure the static levels are what you expect from 0 to typical. Then move to dynamic at increasing speeds. You will no doubt need a calibration section in the design anyway!
Re: How to set background color to black for PCI-1407 on 2nd target machine with LabVIEW 5.1
The background color of your picture should not be changing if your image environment, video monitor, etc. are the same for both systems. Do you see the problem if you use the camera from the first machine on the target machine? What if you use swap out the PCI-1407s between the two systems? Also, are you running the same version of the NI-IMAQ driver on both machines? Best regards, Dawna P. Applications Engineer National Instruments
Re: How can i add more terminals to a SubVi without compiling it again?
If you want to add a new terminal to an existing VI, just right click on the connector pattern and select add terminal or go to patterns and select what you want. Your existing connections will be saved. You will probably have to re-link the subVI in the main or move some wires because of the pattern change. In the future, it's alwasy a good idea to select a connector pattern with more terminals than you initially require. Then, when you do add something, your changes in the main are minimal.
RE: AnalogOutputs info
Dan and Blair; Thanks for the quick replies, but I did set num of iterations to 0, and my buffer length is set to an integer multiple of sinusoid length (I actually found that after I did find discontinuity glitches). But still, stop (complete) the VI and the output stops. Is there some thing else I'm missing? Also, I would like to know if there is a maximum frequency I can create with reasonable resolution. Thanks all. Rick -Original Message- From: Bookwalter, Dan [mailto:[EMAIL PROTECTED] Sent: Thursday, March 25, 2004 1:53 PM To: Mahoney, Richard C; [EMAIL PROTECTED] Subject: RE: AnalogOutputs info Richard You need to set the number of buffer iterations to 0 in AO Start.vi to get it to generate the buffer continuously until you clear the generation.. Dan Bookwalter N8DCJ Hi-Stat a Stoneridge Co. 345 South Mill St. Lexington, Ohio 44904 (419) 884-1219 Phone (419) 884-4172 Direct (419) 884-4195 Fax [EMAIL PROTECTED] -Original Message- From: Mahoney, Richard C [mailto:[EMAIL PROTECTED] Sent: Thursday, March 25, 2004 1:43 PM To: [EMAIL PROTECTED] Subject: AnalogOutputs info I'm not really new to LV but I've always used Commercial Function Gens, and I know that I can use an MIO Bd. I'm trying to load a buffer with a sinewave (1.5Khz) and run the VI and get out a wave form. Most of the example programs show how to do this. But I want to just run the VI, let it complete, and then move on. But when I stop writing the output, the signal goes away. Isn't there a way to load the buffer (circular Buffer) on the MIO bd and let the HW take over and just keep outputting until I run a Stop analog output VI? I know I can just run the output code in parallel with the other code I'd like to execute, but, I'm thinking I should be able to let the HW just do this. I'm relatively sure there is a way, but the solution escapes me. Has anyone have info on this or have this type of code they would be willing to share? Also, What is the highest output Frequency with pretty good resolution I could possibly expect from this type of a config? I am using a PCI 6070E E series PCI bd. in a Win2k setup. Thanks in advance Rick _ This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please send an electronic mail message to [EMAIL PROTECTED]
Re: How to get a Pause and un-Pause function into my vi
This is easily done with a state machine architecture. There is a simple example written in LabVIEW 5.0 that can be found A href=http://sine.ni.com/apps/we/niepd_web_display.DISPLAY_EPD4?p_guid=B123AE0CB989111EE034080020E74861p_node=DZ52076p_submitted=Np_rank=p_answer=p_source=External;here/A. The state machine is a very powerful way to write programs. There are numerous examples on NI Developer Zone and a couple examples that ship with LabVIEW. Do a search in either to find them.
xygraph axis number fonts
using LV6.1 and Win2000. I need to set the font of the axis numbers on a printed graph programmatically. Any knowledge of what property node does this?
Configuring NA display for multiple plots with Labview.
I'm new to labview. I'm trying to figure out how to get labview and an Agilent network analyzer (E8803A) to work together. I've gotten some of the basics to work. I can set the frequency range, number of samples, etc. that I want the NA to test over. I need to figure out how to get Labview to set the NA display so that it shows 2 windows stacked on top of each other. I would like two plots, one of Magnitude and one of Phase. Right now I can only generate one display window on the NA with my VI. I downloaded the Agilent NA drivers from the NI website. I'm sure the functionality is in one of those files somewhere, but I don't know which one. Any help would be appreciated, Thanks.
Re: xygraph axis number fonts
Property node properties- X (or Y) Scale - Marker - Font Then just wire a string to the property node w/ a valid font name (eg Comic Sans MS or Arial).
Re: DAQ Configuration problems in LabView: Error message -10401 AI Group Config
Have you run Measurement Automation Explorer (MAX) yet? In windows, it'll likely be on the desktop or Start Menu-Programs-Nat'l Inst You need to do this at least once with the device properly installed before using labview to control it. See: http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/46f78edd19ba0cc386256cee007201fc?OpenDocument
Re: How to set background color to black for PCI-1407 on 2nd target machine with LabVIEW 5.1
It has nothing to do with video monitor, video card, NI-IMAQ driver version. When I use NI-MAX 3.0.2 to get picture, the picture is black white. The problem is related to Windows 98 kernel. The LabVIEW 5.1 application exe file use kernel to get new setting for black color during running LabVIEW 5.1 application exe file. It may be related windows 98 kernel, LabVIEW 5.1 API. Or it may be related to driver setting because it has color from blue to red Thank you for your support.
xy graph axis number font sizes.
sorry see my earlier xy graph axis font post for the details but what I really want to do is change the size of the font. thanks.
Re: How can i add more terminals to a SubVi without compiling it again?
Thank you Tbob, very useful.
Re: iotech ditgital write
the first while loop checks as fast as it can, if there is any change in the array reference and if so, it sends the new array-data to digital write. the other whileloop simulates a 2Hz signal by setting array(0) to true/false and waits 250 ms. and now the problem occurs. the while loops are very systemperformance depending and as soon as i just move the mouse over the screen, the signals become incorrect. (between 50ms and 300 ms uptime). has anyone any idea how to solve this problem? As the other response pointed out, you probably want to place a delay in your loops. And this seems odd at first, but if you can't afford to wait a whole ms, wire up a zero to the wait. This will cause the scheduler to rotate the round-robin execution queue and will cause smoother interleaving of tasks. Without this, the loops will often interleave at around 100ms increments, which has less overhead actually runs somewhat faster, but is more jerky. Greg McKaskle
Re: Frequency...
I have an image acquired with a pulnix digital camrecorder and this image is in fact an array of striates. I draw a line on my striation image and i take the line profile. Now I want to find the frequency of the striation, i tried with Extract Single Tone Information.vi and it works but only for the most important tone of my signal... I need to detect all the frequencies of my signal. not only the most important... How can I do that ??? The other VIs on that row may be appropriate, or you could use the Extract Single Tone and set the export signals to give you the residual after the strongest tone is removed. You could then loop through and extract several more until the amplitude drops below your noise floor. Greg McKaskle
Illegal Analog Output Name in MAX
Hi, I am trying to create a traditional analog output channel, and it is telling me that the name is illegal. This has not happened before, and the software was just updated to the new version with tasks etc.. I was wondering if that, or the fact that I don't have admin permissions could be a problem. Thanks
Re: Programmatically Raising a Mousedown or key down event
I mean programmatically raise this event. I know that if I actually click on this list box that this event will be raised, but lets say I want the event to be raised first thing when the front panel is ran? Or at any other time I want? How would this be done?
Re: how do you split the output of a waveform chart into seperate channels
thanks
