Toggle PID setpoint

Hi All, Im having a bit of a problem coming up with a solution for my PID loop. What I would like to do is to toggle the SP between two set values (0 and 5 MPa). I know you can do somthing like this with SP Profile, but this does not suit my requirements as I would like to ensure that the Process

Y-Axis for XY-Graphs

Hi, I'm programming an Labview application. Is there a way to change the pointing direction of the Y-Axis of XY-Graphs? The default Y-Axis is pointing to North (pointing upwards), my application (a image simulator) needs the Y-Axis pointing to South (pointing downwards). Thanks!

Looking for HP8720C Network Analyzer Drivers

Also I am new to Labview, what would be a better option, to write in Labview or Visual Basic

how to run LBV application from TestStand/CVI

good morning i have a LBV application (VI) which does some a small job, and i want to run it from TestStand or CVI i dont see how to conenct between both please your advise thanks in advance

Some way to easily find all the hidden *indicators* on the front panel?

Have a .vi with a bunch of hidden indicators. Anyway to show them all? Impossible to go through all the block diagram terminals, right click and ask to show... Thanks-

Re: Y-Axis for XY-Graphs

Hi Terp, Right click a marker (you will get other/more options) of the X-Axis and you see an option Swap Side. This will bring the X-Axis to the top or the Y-Axis pointing downwards. Hope this will solve your problem!

Re: Integrate IMAQ Vision picture into frontpanel

Hello Felix: First, is that you have to remember that ordinarily LabVIEW does not come with IMAQ or Vision tools as a single package and so you have to learn them separately but ultimately integrate them together in application. There is a set of toolset called picture control (early version in

Re: LabVIEW coding using wnaspi32.dll

hi Greg, Noted your input. Will give it a try :)

Re: Using Labjack U12 to control stepping motor with Labview

Hi, no, this is not possible as I explained before. Just use the vis delivered with the LabJack or downloaded from the website. Regards Matthias

Re: LabVIEW coding using wnaspi32.dll

Perhaps, NI should spare some time to look into this matter as most of us do not just simply deal with LV but also third party drivers etc. Still, if anyone out there has got any built wrapper DLLs or CINs for the above, I would very much appreciate that you can post them here or email to

Re: How to use PID add on?

The PID is a toolkit you can buy seperatly. The PID toolkit is included in the LV RT Module. The part number is 777874-03 for Windows -23 for Mac. Waldemar

Re: how can you create a test plan generator using labview

Have you considered to use Teststand? Teststand organizes all the tests and allows to parameterize them. Creating a tool with a similar functionality will be more expensive than buying Teststand and modifing the operator interface. Waldemar

Re: LabVIEW coding using wnaspi32.dll

Dear Greg, this would solve the problem 1a. For 1b I can define a U32 for SRB_BufPointer. I can create the buffer with Initialze Array but I don't know how to assign the address of the array to a U32. I made a look into the LV Data Storage but not into the External Code document so my knowledge

Re: why the output strings are error codes?

It seems you are using a string input to enter a number. The String to Byte Array gives you an array of the ASCII codes of the Input string. I don't think that is what you want. You should either use a numeric control or a String to Integer to get a number an the but it in an U8 array. Hope this

Re: setpoint

Thank you very much for your post But i can't control the time, i need two inputs one for time (real time) and one for the value. For an example; after 15 min the temperature have to be 100 degrees, one hour later the temperature have to cool down to 50 degrees. I can create a chart or waveform

Re: Some way to easily find all the hidden *indicators* on the front panel?

Hallo, First you open a Vi-Reference to your Application. Than connect this with a property node. Use the property panel. After that add a second property Node withe the property controls. controls is an array. This array connect to a for-loop. Inside the for-loop a third property with the

Re: Labview GPIB connection.

Hi Matthew, thank you for replying. I forgot to attach the vi. Actually, I have another question. I'm not able to make a GPIB connection because the driver hasn't been well installed. I would like to uninstall it in order to reinstall it properly, but there no such option on the CD rom. How could

serial data simulation problem

Hi I have been working with a vi witch connects to a serial port and reads load and displacement, how can I simulate the type of data I would normally be receiving , so that I can test everything thoroughly, without actually connecting to the instrument at work. There is a peak load detection

Re: SCAN FROM STRING

Hi IMMA, As far as I know, %f should do the trick. However, you need to take into account the setting for the local decimal point. If your machine is set to use comma , as decimal point, the scan from string will stop at 3 because it doesn't interpret the dot . as part of a number. There is an

Re: serial data simulation problem

The best is probably to make a simulation software and then use a null-modem cable and have your application talk to the simulator via a loop-back serial link...But making the simulator could be some work (if it's just a few commands to support it should be possible to make within an hour, but

Re: serial data simulation problem

Thanks mads , surely there's got to be a easier way ,Perhaps there's a vi around that I could wire up to the relevant paths and this could give we a sort of ascending or descending streams numerics

Re: SCAN FROM STRING

Hi Wiebe, I did not know that. I thought that this was maybe just in LV 7.0, but I just looked in my LV version (6.1) and wow, it's there. I never knew that. Thanks for the info. Shame I can't give your post a rating I have encountered this problem quite a lot, and this will help solve

Displacment value to be represented by up and down blinking arrows

I am recieving data (displacment) and wish to represent this as an arrow blinking up or down depending on the number when the displacment data is increasing the arrow blinks down and the opposite for negative displacment ,Does anybody know a easy way to do this or even better a example vi in V6

Re: AT-MIO-64E and digital output

4 Stars! Luca

Re: Running different VIs in parallel

What is it that stops your calling VI from continuing to run while the subVI also runs? LabVIEW code only waits for a subVI call to finish if you have made it do so by some kind of data dependency. If your problem is that you need to pass data to/from a running subVI, you might want to look at

Re: LabVIEW coding using wnaspi32.dll

Dear all, A wrapper DLL certainly do the job! And, I will try out other possible solutions mentioned by you guys as and when is possible. Thanks for your invaluable inputs/ suggestions, and hope these will also benefits many others. Cheers! ian

Re: how to run LBV application from TestStand/CVI

Here are some steps: 1. Open TestStand. 2. Make sure the LabView Adapter is displayed in the pull-down menu near the middle of the icon window (top). When you pull it down, it gives selections such as C++/dll, Active-X, Sequence, etc. Leave it at Labview. Since you already have an existing

Re: Looking for HP8720C Network Analyzer Drivers

Hi, Do you mean: 8720C Microwave Network Analyzer? It looks like you have to use the driver for the HP8753 (apparently the same) If so, follow this link for the drivers: http://zone.ni.com/idnet97.nsf/9b2b33e1993d877786256436006ec498/99fd4a9bfc561ba7862568ab005fbb48?OpenDocument The better

Re: SCAN FROM STRING

OK, I had a look at the help for LV 6.1, but saw nothing about %p. You also haven't explicitly mentioned how this works in your original message. Can you give me an example of this (textual will do) so that I can try it out? What does the %p option do? Thanks Shane.

Re: How to use with waveform a non linear probe like an antenna

Please post an example of your code. We should be able to advise you on how to speed it up (if possible). Trying to help, Ben a href=http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101RPAGEID=261HRedirected=TrueHUserId=101_3529RFORMNUMBER=6;Ben Rayner/a a href=

Re: Display quality problem

You might try increasing the rights of the user. I have not experienced this problem or know why user rights should correct it but other problems are corrected this way. Perhaps reinstalling the video driver could correct this. If you have corrected the problem I would be interested in knowing

Re: Table cell width: settable programattically in terms of number of characters?

I all ready answered Don's Q on Info-LabVIEW. For the record, his reply follows; Worked great, especially after I added 10 pixels to the final result., thanks again, Don At 11:52 AM 3/2/2004 -0500, you wrote: Under the picture control functions there is a VI that let you put text in a

Re: Ethernet and Labview V5.01

I have the same kind of problem (scott's) i have to communicate with a machine thru an ethernet network. My problem is : what function in labview do i have to use : visa, tcp, .. any help would be appreciated... Ryo

Re: Y-Axis for XY-Graphs

Hi, I'm programming an Labview application. Is there a way to change the pointing direction of the Y-Axis of XY-Graphs? The default Y-Axis is pointing to North (pointing upwards), my application (a image simulator) needs the Y-Axis pointing to South (pointing downwards). Thanks! There is a

Re: Table cell width: settable programattically in terms of number

I am currently have a table control with column headers and I would like to have all of the cells of any particular column to have their widths equal to the number of characters in the header string of that column Is this possible to do programmatically? Currently, I see the cell width and

Re: Communication Labview / Ethernet

I am trying to communicate with labview and a machine through an ethernet network (rj45). I don't know how to start my vi . This doesn't give much information. Assuming that you have other software running on thet computer with the RJ45, you might try TCP or UDP communications. LV running

Re: , instead of . depending on PC

When formatting strings to be sent to the instrument, wire a False Constant to the Use System Decimal Point terminal of the Number To Exponential String and Number To Fractional String functions. As you probably know, instruments send and receive ASCII numbers using decimal points as separators,

Re: I need my spreadsheet data to be in floating point format.

And what is the format string that you're using? And how can the data in the saved file be correct if it's integers and what you are trying to write is floats? Stick a probe on the input to array to spreadsheet and one on the output. That way you now whether you have a problem with the format

Re: Displaying a custom graph

Thank you Joe and Dennis, I think with your suggestions I will now be able to satisfy the requirements of my program. Because of some hardware difficulties at the office, I will be unable to test the program for a short time. However, once I am able to test I will let you know if I have any

oheapmgr.c line 60, I can't change blk dgm

Labview version 5.1.1 I can't edit anything on block diagram or even save file. When I try I get oheapmgr.c L 60 error I can highlight everything visible except the while loop with the arrow, but I can't move, resize, or even clear it. If I click on While Loop it goes strait to error. After

Re: write to network analyzer HP8753D

I'm not sure what you're looking for. There's the function Save/Recall Data and a Data to Memory function that apparently will recall saved data. Can't say how well it works. If that's not the function you're looking for, could you explain in further detail what instrument command you need to

Re: How do I communicate with VME Bus via IOWorks? Visa Session?

The I/O works system is a VMIC/GE I/O system and provides an OPC interface. You might try the OPC client in LabVIEw to talk with the OPC server for the I/O Works hardware. I'd be happy to further advise. Preston Johnson

Communication Labview / Ethernet

Hi I am trying to communicate with labview and a machine through an ethernet network (rj45). I don't know how to start my vi . Someone can help me ?

Re: Running different VIs in parallel

Hi s, Check out the example I posted here. It demostrates exaclty how to control this type of functionality. http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101RPAGEID=137HOID=506500050014570100HTHREAD=87828UCATEGORY_0=_49_%24_6_UCATEGORY_S=0 Have fun! Ben a

Re: AT-MIO-64E and digital output

Thank you Luca. Some times its hard to say no. Ben

Re: Understanding the Pattern-Matching algorithm

Hello Pellman, Thank you for contacting National Instruments. What hardware and software are you using? If LabVIEW, what version? It would also be helpful if you could post your pattern matching algorithm. Please respond with more information and I will be glad to help. Sean C. Applications

Re: Any updates for LabView 2.2.1 to work on Win-XP operating system?

Hello Dr. Fission, Info about a free upgrade toolkit can be found a href=3Dhttp://ae/operations/ae/public.nsf/webPreview/429E45271CFD683786256D= 87006B1EEF?OpenDocumenthere/a. This toolkit will help you convert your code up through the different versions of LabVIEW. If none of these suggestions

Re: Shared Library and DLL in C

Carl, Have you double checked that you have Project Builder installed? Code Warrior is not enough, LabVIEW requires the Project Builder. After building the framework on OS X and trying to access the function, I ran into what may be a similar problem. Where I should have had a pull-down menu of

Re: SCAN FROM STRING

Aha. That's interesting to know. I don't suppose it works scanning from a String? Thanks again Shane.

Re: Why does priority of NON RUNNING vi affects execution time of

iRegular VIs are greatly affected by whether the panel is in memory and whether the panel is open.=A0 I suspect that you have eliminated these effects, but it is always worth restating.=A0 After any of these changes to priorities, perform a Save All before taking any timings./i --- I understand

Re: How do I communicate with VME Bus via IOWorks? Visa Session?

Is the OPC client a DataSocket function? Can't seem to find it anywhere else.

Re: Some way to easily find all the hidden *indicators* on the front panel?

Thanks, that does show the controls (or decorations) but i want to see the **indicators**...

Re: Does anyone have a Labview code program (Ver 6i) which converts 4-20 mA signals to Ph measurements?

I am assuming that the 4-20 ma signal is linearly proportional to PH values. This is usually the case with 2-wire PH transmitters, which it sounds to me like you are using. If this is indeed the case, you simply need to subtract the 4 ma offset, and scale the remaining 16 ma proportionately to 0

Re: I pull fiftyfour bytes of data from MicroProcessor's EEPROM...

Hello, You mention that you send a string to the microprocessor that tells it how many bytes to send. Instead of requesting 512 bytes, try reading 10 times and only requesting about 50 bytes at a time. If that doesn=92t help, try directly communicating with your microprocessor through

Re: I need timed data logging with continuous graphing

That will work until the user tries to stop the program and it doesn't exit until the 1 hour timer expires. Much better is to use the Elapsed Time function in LV 7 and use the output of that to go to a different state in the program or wired to a case statement.

Re: setting up position of front panel objects using input from file

i downloaded the labview 7 trial version and checked out u r modifications. thanks for the help u r changes seem to do the trick. however i am now encountering a new problem. i see a red square border in my vi diagram and whenever i press the run continuously icon, the vi executes and then stops

Re: Why does priority of NON RUNNING vi affects execution time of

iI am leaning toward this being the OS related. /ip For what it's worth, I DID verify that setting the priority of the tester to match the dummy caller restores the normal execution time. Also for what it's worth, I ran the same tests on Mac OS X. The same behavior results, except that the

Re: Toggle PID setpoint

Hello DavidT - Have you viewed a href=http://digital.ni.com/public.nsf/websearch/125F27AC143B6AFD86256C2B0004A4DC?OpenDocument;this/a Knowledgebase? It tells how to generate Setpoint Profile in LabVIEW for a control application and even has an example program. As for implementing a suitable

How can complete waveform data be written to a excel file using DDE.

I want to write a complete waveform obtained through a sub VI to an excel spreadsheet using DDE. Please reply me how to do this in Labview 7.0

Re: How to use PID add on?

Hello worker - If you have installed the PID toolkit, there will be a control palette on your functions palette. You may need to reboot your PC for this palette to appear. A great resource for LabVIEW PID Control is located a

Re: Problem OPC server datasocket display real voltage

Hi Daniau, a href=http://zone.ni.com/devzone/conceptd.nsf/webmain/DF8C0A4BA2E2B22A86256A3700592BEA?opendocument;Here/a is a tutorial that explains how to connect LabVIEW to an OPC Server via DataSocket. It is odd to hear about this type of behavior in LabVIEW, where the first unit of data is

Re: How can complete waveform data be written to a excel file using DDE.

Can I ask why you want to use DDE? Microsoft stopped development on DDE quite a while a go and it never worked very well in the first place, imho. LabVIEW still has DDE functions but they're no longer on the palette. They're in vi.libplatformdde.llb but I recall ever seeing any Excel examples.

Re: How can complete waveform data be written to a excel file using DDE.

You are right it is an old process and not used now. But as an enthusiast I want to solve this matter. It is easy to write data on an excel spreadsheet using DDE by providing data with rows and colums to write at. But I want to write complete waveform data obtained by any subvi to a excel

Re: Why does priority of NON RUNNING vi affects execution time of

Thanks for the link, though I'm not sure it applies. 1... I'm not using RT things - there's not an RT board present. 2... iThese shared resources include global variables, bnon-reentrant subVIs/b,.../i -- So a non-reentrant subVI is a shared resource. 3... iPriority inheritance allows the lower

Re: Why does priority of NON RUNNING vi affects execution time of

The problem with this idea is that in the case where I don't load the dummy caller, the resource is not shared - there's only one call to it! Apparently the fact that the subVI is higher priority is enough to get it to be declared shared, even though there's no competition for it. Do you agree

Re: Why does priority of NON RUNNING vi affects execution time of

100% sir! I think the observations you have made are consistant with your wrap-up. The 2 guesses we are making are; 1) Priority inversion is not limited to LV-RT. 2) A VI calling a sub-VI with higher priority is enough kick in the priority promotion. Now that you point it out, I did not stop

Re: How can complete waveform data be written to a excel file using DDE.

After a little more searching, I found A href=http://zone.ni.com/devzone/devzone.nsf/webcategories/B7AA6C07A04F6A708625683C23F6?opendocumentnode=DZ52049_US;this page/A with a couple of links to DDE examples with Excel. One of them is specifically for writing an array.

Display a http data link In a Labview Application

I need to create a http://; link in my Labview application. My Labview application searches for a keyword on my intranet, and returns the htm file name. I can concatenate the file name with the web address and display the link in my application However, the link is just a text string, and

latest NIDAQ version for LabView 5.1 and AT-MIO-16DE-10

I'm re-installing everything to run LabView and my AT-MIO-16DE-10 card on an old Windows 98 SE box. I have actually performed a clean re-install of the OS, so nothing remains. What is the latest version of NI-DAQ that supports LabView 5.1? The readme for NI-DAQ 7.1 says it only works back to

Re: labview advantages Over other languages

This a href=http://www.ni.com/labview/switch;website/a has some great articles on the advantages of using LabVIEW. The resources there provide detailed information about LabVIEW, the technology behind how it works, and how to use it. I hope that helps! Becky B. Applications Engineer National

Re: Publication Quality Image Files [.TIFFs] of Waveform Graphs or Waveform Charts?

Have you tried printing to a postscript file, instead of printing to a printer? You might be able to convert a postscript file to a tiff file using professinal image processing applications, such as Photoshop. George Zou http://gtoolbox.yeah.net

XY graph manipulation

I am plotting an XY graph (X for time and Y for an amplitude). As i plot this graph the whole set of points are presented. I wish i could present the graph, reducing the X axis width(10 seconds width) and iterate to plot 10 sec to 10 sec(segments of 10 seconds). one problem is time values are not

Anything in Labview like an MS GroupBox?

I want to organize my controls on the front panel into categories. My usual Windows programming way of doing this is labeling the groups with a GroupBox Control, which puts a nice text label on the recessed line that encloses the controls. Is there something handy in LV with the same

Re: Display a http data link In a Labview Application

There's a VI in LV 7 called Open URL in Default Browser core in vi.libplatformbrowser.llb (I think its just called Open URL in Browser in older versions). You could use the event structure to detect a mouse down? on the string indicator and pass the url to the function. Before the event structure,

Re: Publication Quality Image Files [.TIFFs] of Waveform Graphs or Waveform Charts?

Is there a way to do that without having a postscript printer and its drivers installed?

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

Noise Filtering

I have a large number of data files containing values for acoustic and vibration data from machinery. I am trying to look for distinguishing features in particular groups of files (covering certain dates) but there is a lot of random noise contained within the signals so this is proving difficult.

Re: write to network analyzer HP8753D

Thanks Dennis, I didn't see that vi before , it is actually what i was looking for.

Re: labview advantages Over other languages

Obviously, in LabVIEW, multi threaded programs are easy to write, and easy to read.

need to program vi to correlate 2 signals from large data files

I am trying to write a vi in version 5.1 that will correlate two signals and output the correlated signal. I also need to build a loop to read concurent subsets of data from a large tab delimited text file, and input the correlated results into an array, but I am not sure how to use the build

Re: Publication Quality Image Files [.TIFFs] of Waveform Graphs or Waveform Charts?

How about enlarging the the image on the screen before getting its image? I'm thinking about graph that fill 3X12 screens? Ben

Re: Displacment value to be represented by up and down blinking arrows

I only use V6 , unfortuantly cant open , you must be using v6.1 ,thanks for help anyway.see if I can talk someone into recompiling . Thanks

Re: labview advantages Over other languages

Thank you all very much A special thanks to BeckyB for the website it is really helpful

Re: Fatal internal error:memory.cpp,line 593

typedef struct { long dimSize; double elt[1]; } TD3; typedef TD3 **TD3Hdl; TD3Hdl *Tach noErr = NumericArrayResize(fD, 1, Tach, 8); .. It does not compile i get the following error:- error C2664: 'NumericArrayResize' : cannot convert parameter 3 from 'TD3

Re: Why does priority of NON RUNNING vi affects execution time of

Regardless, I am working fine with subroutine priority, but I want to understand things better. I've read the app note (#114, I think), but I can't see a connection between the words there and my situation here. I asked around at work and it is definitely priority inversion. Here is how it

I change the dll path in call library function, but path has...

I change the dll path in call library function, but path has not changed when I look at it next time. LV 6.0.2 Windows2000

How can I programmatically set the camera drivers through LabVIEW

What I would like to do is to programatically set the camera drivers for an interface using LabVIEW. I am not getting much luck on trying to drag and drop a non-shipped camera driver into MAX under the NI-IMAQ/Data/ So I would like to programatically set the camera drivers from LabVIEW. How

Re: Anything in Labview like an MS GroupBox?

Is there something handy in LV with the same functionality - A sort of decoration that visually groups controls into categories that includes a text label? And I would like to avoid clusters, since it changes the way you can work with button latching, etc. You can group any number of

i am searching for the image update VIs to download

i would like to refresh my VI that i put up on the web without having to refresh the entire page.From your results i was told to use the image update VIs located somewhere on your website.i have been searching for this for sometime and i cant seem to find it.can you please help me locate it or

Re: How to programmably control the 3D plot, switching from greyscale to colorgram?

hi, it works perfect for me now. Thank you so much!