Re: How to build a graph to display displacement x time?
Hi Adriana It will be that you save this program for me in a version of LabView 6 and order for me Thank you Rogerio
Re: pc-dio-96
If you are reconfiguring your port in order to read the port, the port will be truely reconfigured as read inputs with the default state being pulled up. If you use the same task ID that was generated from the write config in the read port function, you will be able to readback the written value.
Re: Generating High/Low Limit Waveforms
Do you simply want to offset the magnatude of the waveform or allow for time shifting of the waveform as well? One method I have used is to offset the waveform and rotate it forward and reverse taking the maximum value of all three waveforms for the new upper limit. similar for lower limit. If you have multiple known good waveforms, take the maximum values of each waveform as your starting point.
Re: ModBus/tcp with LabView
I will post a library when I get back to the office. We use WAGO controllers fairly often. Give me an e-mail to send them too.
Re: convert vibration units in spectrum
first convert your raw acceleration units to ft/sec/sec (or whatever unit you want velocity and displacement) Then use the integrate function (twice for displacement). You may use FFT for frequency content but it does not help for velocity or displacement. If you have already tried this, you may have seen undesirable results, you will typically have to filter the accel signal in the range of your mechanical system response. If your system can not vibrate faster than X, you should filter just above this frequency.
Re: Operations Menu Problem
did you set the connector pane without relinking to the sub-vi?
Re: Why does my computer locks up after some time, no memory...
Does your code hang or just timeout. You have a 10 second timeout. When your program does not respond, open the diagram and turn on execution highlighting, where is the code? Your while loop has a loop counter exit but closes the session after the first iteration. Lower the timeout, don't close the session on the first iteration, look at the characters that are returned to see if it indicates an error from the device.
Re: can i print out two or more graphs at one time?
you can pass a reference to each graph to a print all four vi that can get all of the attributes of the graph in order to reproduce them. You can also construct an HTML report with all four graphs laid out.
Re: write data to file periodically
Are you reading the 15 minute data file and computing mean? how about, writing the data to file as you are but adding the running sum of each value and dividing by N at the end of the sample period. This will eliminate the file read/compute accumulate the running sum as a double so that you don't run out of headroom. (or divide by N before adding to the running sum).
Re: How to control a solenoid using LabView w/ a NI PCI-MIO-16XE-10 DAQ?
Yes this will work fine. Please add a flyback diode to your solenoid current. That is a diode to flow current from the negative terminal to the positive when you cut current to the solenoid. The back EMF spike can be quite high when the coil field collapses.
how to install and use labview goop wizard in labview 7.0 or 6.1
is there any tool kit for implementing my application using goop concepts
Re: How to control a solenoid using LabView w/ a NI PCI-MIO-16XE-10 DAQ?
With the equipment that you have, a good choice would be Opto-22 series for the G4 series of the Opto-22. Select the screw terminal base and an ODC module appropriate to your power/voltage requirements. this will use the TTL digital output to control a power solid state relay. If you look to the other signal conditioning products from NI, they will allow you to do the same thing as well.
Re: Aborting a SubVI
The while loop combined with a state machine breaking your problem up into pieces allowing you to check for abort at the end of each piece. Works well.
Re: Can i make the communication of Raynger MX4/MX6 ?
thank you
How to modify header (.h) file included in CAB file created with labview app builder
When you build a shared library with LV 7.0, the .h file is automatcally generated and included in the distribution cab file. How to replace this .h file with my own .h file?
Re: Why do some older instruments require waits between writes?
Indeed the older instruments may not have been fully compliant. The response time of the micros in these instruments running @ 4 Mhz is just not good enough to respond to (or even change bus states) back to back commands from a 3 GHz processor. They may also have depended upon one of the other forms of handshaking requiring you to test for device ready before communicating again. The developer tester of the time would not have encountered a problem depending on the test methodology. Even today, a rush to market will leave untested and non-compliant corners of device interaction. Nothing to do except hope that you are working with a company that is responsive to your needs. My opinion.
Re: Best way for recording instrument commands
The IVI model for labWindows/CVI instrument drivers typically keeps a state for the instrument under control to solve exactly this problem. When you execute a get state method for the driver, you get all parameters even though the instrument does not support query function. This is the best way of supporting what you are describing. The method you describe would require you to replay the entire transaction to reach the same state instead of just the state. Writing a driver with internal state is not trivial because you have to model the instrument completely (in order to support the complete state). You may choose to inplement only what your application requires or if the instrument is one of the IVI supported classes, you may want to look to IVI.
Re: pwm in closed loop
The PWM function should work fine. Check out the DAQ examples for counter timer PWM functions. The second part of the question is closed loop control. How fast do you need to close the loop? How accurate does the loop need to be? 6020 Certainly you can close the loop at low rates (10 Hz for the 6020). Higher rates can be achived but you have to look at the requirements tighter and the communication overhead of the 6020
Automatically creating a new config file in an application
My application automatically creates and/or modifies an .ini file to save key settings in the software. This works fine when running it within LabVIEW itself, but when I run the .exe application file created using LabVIEW 7.0's application builder, the software always uses the default settings I provided to the Read Key VI, rather than creating a new file. Why does this happen and how can this be avoided?
Re: change display size of plot area
Simple way would be to place a transparent boolean button over each graph so that you can use the button event to pop up a big graph and put it away. There are other ways as well. If this doesn't work for you, comment.
Re: synchronising cluster graph problem
Turn off run with multiple threads option. You are probably seeing the effects of user interface thread not getting any time to update the graph. Also set front panel smooth updates. This may not yield the performance that you want but it may be the answer to your question.
Re: teststand pxi instrument id between embedded and extended chassis
the DAQ function on the pallet that will return the device name for each device number. use this to create an abstraction manager to reference named devices. Keep going with the approach of reuse without hardcoding info. It will be worth it.
Re: Can i make the communication of Raynger MX4/MX6 ?
Hallo Dennis: Thank you for your help. But i don't know how can i add the Serial End Mode for Writes to the VISA Instr property node and use TermChar as a value. Can you send me a example. thank very much. Long.
Can I run Labview or CVI program withoug engine installed
I have some questions about running Labview or CVI programs: 1. Is it possible that I can run a Labview or CVI program in a computer that doesn't have corresponding engine installed? Sometimes I need to run such a program in another computer, but I don't like to install the engine just for that program. 2. I have seen some people mention here to create an installer when you build the executable. Is the installer an option of exe builder in Labview or it is another tool like exe builder? 3. Can I run an exe program built by Labview 6.0 on a computer with engine of Labview 7.0 or higher installed? Thank you very much.
Where is this file?
I tried to download a patch from your FTP site last Thursday, then again today. The file is not found on the FTP server at this URL: ftp://ftp.ni.com/support/labwindows/cvi/runtime/7.0/win32/cvirte70.zip Can someone please tell me where this file really is located? I need it to patch my product.
Re: break a for loop
Hi Tommy, forget it - not possible - use a while loop regards Werner
How do you write to a 3D array?
I know this is probably a very simple questions, but for some reason I can not think of how to write to a 3D array. The application that I am going to use this for is that I have multiple graphs with x and y data points, and I want to be able to write all the graphs with their data points to a 3D array instead of having a large amount of 2D arrays. My main goal is to be able to use this 3D array with a graph so that I can click through all the graphs after I have done my measurements. I appreciate anyone that can give me help on this matter.
Incrementing a GPIB parameter in Labview
Hi I an trying to product a program in labview that increaments a GPIB command to a Function Generator. The command format is: FRQ 1.0E + 2 (this equals 100Hz). I need to increament this up 1MHz so, I have written a bit of psudo code to demonstrate what I require. For i = 1Hz to 1MHz // Send freq requ. to function gen // FRQ i //QUERY Function Gen to ensure freq has been changed =Q // If Q=FRQ then Next else Print Error: out of sync! Stop Regards Wayne Lawson
How to modify WaveformChart history data length programmatically in LabVIEW?
How can I change waveformchart history data length in Labview during a VI's running?
Re: Who can I build music equalizer in LabView?
Hi, It's still not going by the music..
Re: Who can I build music equalizer in LabView?
I have Windows XP.. :-/
Re: Who can I build music equalizer in LabView?
Hi, I have a few things that I don't understand on the picture.. 1. After the unboundle function I need to put on each one of the exits a LED? 2. What is the EQ Display clusters? What do I need to put on them or I just need to create them by the create -- indicator ? Please explain me the VI because like I said I'm very new on LabView.. Thanks, Reiss Rotem
Re: Who can I build music equalizer in LabView?
I still don't realy understand.. Can you please show me the front panel?? If you have MSN Messenger or ICQ please write me the adress/number and will talk in there.. 10x..
Re: Who can I build music equalizer in LabView?
Hi, You build to me a demo equalizer this is not the real signals that coming from the sound card.. I want the equalizer to show me what coming out of the sound card.. Do you understand? 10x again
Re: Control the LPT voltage
Hi, Yes, I know.. This is 1 more thing that I want to talk about.. what is the LPT port voltage? 5v or 12v? I think that 5v but I'm not sure.. 10q very much..
Re: Control the LPT voltage
Hi, I'm feeling very stupid because I've alreasy forgot what is TTL.. :-/ I looked in my book of the basic course I and I didn't find nothing about it but I read the part on the LPT connection.. All I remember is that TTL realated to a squre signal or something like that.. please remind my.. :-( But from what I understand from you I need to use high TTL and I can adjust it to send 1.7v to the pin that I need?? (1.7v because this is the LEDs voltage.) Thank you, Reiss Rotem
Re: Control the LPT voltage
Hi again, Thank you about the link I'll read it right away.. but I don't think I explained my self very good I'll write to you exacly what I Want.. I saw a guide on the internet who to bulid a LEDs organ And what it do is turn the LEDs on and off when there is music, by the rate.. I don't know how to build it but I want to know how to do the first part at least - To build an LPT cable that in is one side there is the computer and on the other side led on each pin.. If its not the way it has to be done please tell me what is my mestaiks because I know I have lot of them.. Thanks again, Reiss Rotem
Control the LPT voltage
Hello, I just completed the LabView 7.0 Basic Cours I.. I'm playing in LabView to get to know more functions and I want to control the LPT voltage is that possible to do with LabView? Thank you, Reiss Rotem
Re: creating a LabView VI from LabWindows application
What I learned so far is that in LabWindows you can create an IVI driver, you need the fp and dll parts. The wizards walks you through. LabView and LabWindows sits on top of this. The IVI process creates the c and h code and must be written correctly. Then in LabView you can import this and if the IVI is written correct LabView wires up a VI correctly. This is how it is supposed to work (I think) I know of folks who have done this, our NI folks at local seminars tell us that this can be done but there is not documentation. That is why I inquired. Thanks for responding Lou Eichner
creating a LabView VI from LabWindows application
What is the process of turning a LabWindows application into LabView VI.
Receiving SMS texts instantly
I need to be able to receive SMS texts sent from a mobile phone instantly with Labview. Firstly, what kind of GSM modem if required - can a standard PCMCIA laptop modem be used (i.e vodafone) or should I use a serial modem with full Hayes AT support. Secondly, how is labview configured to look out for and receive the SMS text messages. If a Hayes AT compatible modem is used would you simply read the port status as you would with serial comms with a data acquistion system ? Thirdly, how would a serial Hayes AT command set modem act when receiving multiple incoming SMS text messages ? Can it only hold 1 at a time ? Regards Mike Newett
Re: Memory leak only when compiled
Thanks Randall, the problem was related to file I/O. I found a subVI that was using converted LabVIEW 5.1 versions of the configuration file VIs with references opened with the LabVIEW 6 Open.vi. The reference was passed back out and closed with with the LabVIEW 6 close, but apparently there is some incompatibility here that only shows up when the application is compiled. Matt
Re: I want to make a arrow picture blink when The Load cell is travelling down
nice to hear this .
Why are shift registers are so slow
I am dealing with large amounts of data, arrays in excess of 65000x15. I need to build the array in a loop. When I use the shift register approach it takes forever. The fastest way I have found so far is to write the rows out to a spreadsheet file and read them back in. This is fairly quick, but seems rediculous to have to do. Memory should be much faster then a HD
test message, please ignore
this is a test message
Memory leak only when compiled
I have a memory leak problem with an application built under LabVIEW 6.0.2. I have found that the source of the problem lies within a loop of code that runs every minute. It reads numbers from a remote data socket server and appends the numbers to 75 text files using the Write Characters to File.vi. The code also does some calculations with these numbers using formula nodes and discrete multiplication, addition and subtraction, but it does little else and does not contain any of the usual suspects for memory leaks. This code will run happily in LabVIEW for days, but when I try to build the application and run it, the memory it uses and the number of handles shown in the windows task manager gradually increase for 12 to 18 hours until the app stops responding. Is there a difference in how the VI and the compiled code access data sockets or files that might contribute to this problem? I have tried compiling this on two computers and running it on a few others, so I don't think that the problem is unique to the run time engine or compiler on my computer. I don't want to tie up LabVIEW to log this data and I can't tolerate interruptions in the data collection. In addition, several other computers need intermittent access to this data, so I don't want to get rid of the data socket communication. Where can I turn when the compiled app does not work?
Re: I need a Program or a Driver for the NV 40/1CL
Dear germannubie, what is NV 40/1CL ??? Pls enlighten a german-oldie regards wha
Re: LabView7 and NT4
no problem regards Werner
