TimeStamp miliseconds control in Labview

the question is about the miliseconds part of timestamp. It seems there is no way to control(write) directly the miliseconds part, also when read there is no ms part in the indicator. What is the structure of the time stamp record?Are there some way to write and read ms part (but without string conversion), as bytestream for example and use/write it as array?

I'm not sure what you're concerned about more, the storage space (TIMESTAMP = 128 bits) or the processing time (conversions).
If it's the storage space, you COULD sacrifice the extra range by typecasting to a cluster of four U32s (no conversion time), extracting #1 and #2 (discarding #0 and #3) and storing those two. That's assuming you can live with the overflow that will happen in the year 2040 or so.
Another trick you might consider is storing ONE timestamp value, and ONE mSec timer as a starting point, then store the mSec Timer (32 bits) with each record. When it's time to display a record, use the record's timer minus the starting timer as an elapsed-mSec value, and add that to the starting timestamp to get an absolute times
tamp for each record.
Be careful with that, though. The timestamp does not have mSec directly - it looks like field #2 is fractions of a second - so you'll have to convert one or the other to add them correctly.
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

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Is it possible to create user defined control in labview

in .net we can create user defined contol in which i can put more then one control and,, can use it as single control when needed,, but,, how this possible in labview,,
actually in my program i have a tab control and,, in that tab control there are 8 pages,, now there are 5 different kind option selection for each page lets say "a" "b" "c" "d" "e",,,,,.,. so,, when i select "a" configuration for tabpage 1 should show.. "a"(control collection) on tabpage1....and,, same should b possible for all 8 pages............................. this can possible if its possible to create user defined contorl in labview
while in .net its very easy task i m confused here,..,.
i put these controls in another 5 different VI,,,, and tried to call in subpanel but,, i dont find the solution,,,
Attachments:
tabcontrol.vi ‏1 KB

Hi,
I've tried to open you attachment but LabVIEW tells me it's not a vi... could you check it and repost please ?
I'm not really sure of what you need but you CAN customize you control in LabVIEW, it is not hard, you just have to know how it works
Sometimes being good at another programation language confuse you more than it helps because you try to do as you are used to... the difficulty it to "translate" functions from a language to another.
I do know how frustrating it can be when you think "Damned, it would take me only 5 minutes to do that with language a and after 10 hours with language b it is still not working "
You have to get in LabVIEW way of thinking, I wish you good luck !
A quick exemple... this might not do exactly what you need but it may help you anyway.
When my feet touch the ground each morning the devil thinks "bloody hell... He's up again!"
Attachments:
exemple.vi ‏55 KB

How can i use activeX Control in labview?

how can i use activeX Control in labview?
please describe me step by step.
thanks.

Well..that was quite helpful..but now I'm encountering certain problems. I've attached the VI I've made.
I don't need sound at the moment so I dropped it. (Although I tried to play it..but all I could hear was a very annoying sound.) Secondly I don't want to display any date or time..so i dropped that property too.
Now when I run this Vi...the webcam turns on, the screen of videocapx pops up..then the webcam light goes off..and another pop up appears saying..labview is not responding..and i have to close it reluctantly.
I haven't placed the stop capture property in this vi. i checked it by placing it too..but that doesn't work.
I would like to notify that my actual task is to acquire image and then compare it with another one already present on my pc. I want you to please help me out..solve my first query then I'll proceed with the latter part.
Attachments:
activexvideocaps.vi ‏20 KB

Auto Tune prior to running motion control program (LabVIEW)

Hi,
I am controlling Parker Compumotor (404-LXR) linear servo table via GV6 drive and PCI-7344 motion controller.
The problem is that I always have to run automatic tuning in MAX when I turn off all the system and restart it.
Before I use the automatic servo tuning in MAX, the servo table buzzes and oscillates wildly. Cabling seems to be successful as linear servo motor is completely controlled by LabVIEW after auto tuning in MAX.
I wonder how I can just run my LabVIEW program without running Auto Tune step.

Hello Gino,
Thank you for using our discussion forums. Yes, you can programmatic load the PID parameters from LabVIEW. Tune your servo using auto tune, once you are satisfied with the response look under the Control Loop tab for the PID parameters. In LabVIEW use the Load All PID Parameters.flx and use the tuned parameters from Measurement and Automation Explorer as the PID Parameters input for this VI. Place the VI before the multistart.vi. This will make sure the correct PID settings are used. I hope this helps you out. Have a nice day!
Regards,
Nipun M
Applications Engineer
National Instruments

Would like to monitor and control a labview application with a hand held device.

Would like to monitor and control a labview application with a hand held device.
Would like to use a palm or ipac on a local area network or communicate directly with the PC running windows.

LabVIEW doesn't run on a hand held device. But, check out these documents:
Is it Possible to Use Remote Front Panels to Control a LabVIEW VI Remotely Using my PDA?
"What OS is recommended for LabVIEW to run on a PDA?"

Off the shelf XY gantry system controlled with LabView

I am looking for an XY gantry system that I can easily control from labview. I need a workspace of 11 by 16 inches with minimum clearance of 6 inches. I was wondering if anyone has used a commercially available XY gantry or has any experience with an XY gantry.
I have found these two tables/brands that already have LabView drivers
http://www.zaber.com/products/product_detail.php?detail=G-LSQ450D450D&tab=Series%20Features#tabs
http://www.techno-isel.com/tic/Catdas/Gantry3.htm
And this one that looks promising too
http://www.animatics.com/en/products/table-top-robot/animatics/table-top-robot/2-axis-ttr-xy-configu...
Both Zaber and Techno Linear do not know of anyone in my area (Loveland, Colorado or Denver area) that I could go visit to see a table and I would like to see a working system before making a decision to buy a new system. I have not been able to talk to an engineer/technical sale representative at Animatics yet.
I am looking at using the XY gantry to position a sensor over a tray of parts to measure some properties of the parts. The system I am designing does not need an high accuracy table (+- 0.005" is fine). I would prefer to spend about $10K for a XY gantry table including any required controllers and hardware.
Thanks,
Brian

You have a good start, but 2 other things that you need to consider are your load and speeds required. This will determine the mechanics of the gantry(ball screw, acme screw, belt, bearing type, etc.). It will also determine if you need servos or you can get away with steppers. You then need to figure what kind of motion you need. Point to point moves can be accomplished with non-interpolated controllers, but any kind of coordinated motion will need a motion controller that can do true interpolated motion.

Automation unit control with LabVIEW

I use LabVIEW 7.1 and NI FieldPoint devices (FP-1000) for educational
purposes. I want to control a automation unit which has got 6 digital
input and 6 digital output. Before I used the sequence structure, but
actually I am not sure the solution whether true or not. How can I do
like this control with LabVIEW?

Duplicate.
Try to take over the world!

Simple motor control with Labview

Can anyone suggest a simple motor to be controlled by labview. I am interested in making a small scale elevator that is controlled with a labview interface. If anyone could point me in the right direction it would be greatly appreciated. - Bryan

Attached is the vi for the program. I will also try and attach the C code for the project. It took a lot of failed attempts to get it working so I hope this works for you. I don't have a schematic for you, but if you look over the C code it should let you know. Also I used the CCS development kit 16F877A. I'm not great at programming in C so there is a good chance you can clean it up a bit.
I'll keep an eye on this post if you have any questions, when winter comes I'll probably work on this some more.
Message Edited by nutmegzzzz on 09-19-2005 01:56 PM
Attachments:
Serial Read with Timeout version 1b.vi ‏169 KB
LED and Motor Control from LabView - Complete.c ‏3 KB

Manual setting change on Tektronix 3014 Phosper Oscilloscope when it is control by Labview IVI driver. Is it possible?

In my labview test program, I would like to allow manual setting change on Oscilloscope like moving cursor position but other part is still controlled by IVI instrumental driver. Is this possible. I found the oscilloscope is locked once it is controlled by labview and don't allow any setting on the scope front panel unless I power off and then power on the scope.

There is a GPIB command called "Unlock" that will unlock the front panel (see page 2-32 of the programmers manual). You will need to send this using a Visa function call since it is not supported by IVI. Unlocking the front panel may cause problems if you are using IVI state caching because if settings are changed (other than cursors) the state cache will be out of synch with the actual settings. So, I suggest you disable state caching using MAX. This will degrade performance somewhat. I also suggest you lock the front panel again ("Lock" command) after the manual settings.

DC motor closed loop control through labview using usb 6008

Hello
i am doing a project in which i want to control the speed of a DC motor (PID control) through labVIEW 2010. I am having a DC motor, a drive unit that regulates the voltage to the motor by getting analog voltage from 0 to 3.3V ( it can be used for both directions) and i also have a NI usb 6008 board. The problem is that i can't feed the usb 6008 with the digital signal from my hall effect speed sensor. Is it posible with this setup to control the motor?? I can also try to use the pulse as analog input and trasform the frequency into rpm's. Then i am thinking of generating an analog signal to feed the motor drive. If you have any further suggestion of a probably better hardware setup would be more than helpfull to me.
Sincerely
Jason Chaloulos

Hello Michael
Thanks for the reply. I came across those topics before and all of them are trying to generate a PWM signal as output i want to use just an analog signal output so timing on the output is not that important i guess. i am struggling on getting the frequency from the digital input signal that my hall effect sensor generates. Since the maximum speed of the motor is 3000 rpm and with my tooth wheel the maximum output frequency of the sensor will be 300Hz which i see its way less than the limitation of my ni board. Is there any tutorial documentation that might help me with this one ? Thank you in advance.
Kind regards
Jason

How to use the drop event of the tree control in LabVIEW 8.20?

Hi,
I am using the two tree controls in my application to provide a option for the user to drag and drop item from one tree to the other. I have to validate the user selection. I tried to capture the user drop event using the event structure. The problem I am facing is, I am not able to drop the item even though i have wired a constant true to the filter(Accepted?) in the event case. I have enable the property(Allow droping) in the right menu of the tree control also.
While configuring an event case for (drop, drag entered and some thing like this) only I am getting the problem otherwise it is working fine.
What do i need to do to caprture the drop event ?
Is there any way to avoid the item duplication while droping a new item in the tree control ?
or how can i do this?
Thanks,
Pandiarajan R

Hi Pandiarajan,
I hope you are doing well today! There is a lengthy discussion on the Tree Control Drag & Drop feature at this forums post including contributions from the developer of the Drag & Drop feature:
Tree Control Drag & Drop in LabVIEW 8
By avoiding item duplication, do you mean that you don't want the same item to be in the old tree control or do you not want more than one item in the new tree control?
Adnan Zafar
Certified LabVIEW Architect
Coleman Technologies

How can I use an Access front end and Access button to control a LabView Shared variable boolean?

My company has invested a lot of money on the office network to write many many access databases and front ends. I'm looking for a way to tie a button on an access front end to toggle a LabView boolean shared variable to notify me when they changed something on their side of the network. I'm not seeing anything that helps on a web or forum search. They don't like the idea of a separate labview control that they have to push a button on to let me know.
Thanks
Solved!
Go to Solution.

Hi Patrick,
While this is not the intended purpose of Network-Published Shared Variables, you might be able to accomplish this by writing separate accessor VIs for reading from and writing to the variable, making sure to wire the inputs and outputs. Then, you could build a DLL, making sure that you include the accessor VIs as Exported VIs and include the DLL Library in the Always Included section of the DLL Build Specifications. During this process, you will define the function prototype, which will provide the function call, required parameters, and return values. Once the DLL is created, you can then call it and its functions from another programming language (C, C++, C#, VB, etc.). This may or may not work, but it is the only way that I can think of at this point. I have included some references that may help you in this process.
Building a Shared Library in LabVIEW (White Paper)
Calling LabVIEW VIs from Other Programming Languages (White Paper)
Calling LabVIEW DLL From C# (Forum with Examples)
I hope this helps.
Regards,
Mike Watts
Product Marketing - Modular Instruments

Help me in my mini project about dc motor control using labview

hi,
actually the idea is that using pid controller in labview.. controlling motor.i.e giving a setpoint to pid... n checking whether motor is running accordinly using a sensor.. i.e feedback n/w... i dnt knw hw to proceed.. can u help me with the circuit diagram

Hi swats,
"i dnt knw hw to proceed.."
I suppose you mean "I don't know how to proceed..", something is wrong with your "o" key
I would suggest going to the library of your school or university and get a book on basics of electric devices. There you will find a lot of hints on how to measure speed of motors and how they work. In fact your question covers several seminar hours in "Electrical Measurements" course at university...
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

Can I set a value to a control in LabVIEW 6i?

Hallo,
i wish to control an output with a checkbox (true/false). In several
times it could happens that this output come true. How can i set the
checkbox, whos control the output? I try with an OR-gatter but LabView
doesn't allowed feedback-loops.
For Example: ------------- (feedbackloop->ERROR!)
I I
V I
-->OR --->Checkbox ---------> Output
I True/False True = Value
I False = 0
I
I
Event happend--true--I
I think, the problem is one time the checkbox is an control, who
inter
active with an user and in the other case (event is calling) the
checkbox is an control to illustrate a state.
Can anybody help me to solve my problem?
Thank you and sorry for my english.
Ciao, Ralf.

Hi Ralf,
create a property node for your control (diagram view:
popup->create->property node. Select "value" on the property node. Now
you can wire any boolean output to that property to control your control.
Good luck,
\Ulli.
Ralf Schade wrote:
> Hallo,
>
> i wish to control an output with a checkbox (true/false). In several
> times it could happens that this output come true. How can i set the
> checkbox, whos control the output? I try with an OR-gatter but LabView
> doesn't allowed feedback-loops.
> For Example: ------------- (feedbackloop->ERROR!)
> I I
> V I
> -->OR --->Checkbox ---------> Output
> I True/False
True = Value
> I False = 0
> I
> I
> Event happend--true--I
>
> I think, the problem is one time the checkbox is an control, who
> interactive with an user and in the other case (event is calling) the
> checkbox is an control to illustrate a state.
> Can anybody help me to solve my problem?
>
> Thank you and sorry for my english.
>
> Ciao, Ralf.
>
>
>
>

When I resize the font for the Page Labels on the tab control in LabVIEW 7, the Increment/Decrement size gets messed up. Is there a solution to this problem or is this a bug?

I have noticed in LabVIEW 7.0 and 7.1 that when the text in the page labels display is enlarged, that the arrows enlarge but the top arrow enlarges more then the small arrow but then when you decrease the text size, the arrows stay remain large. This is not a problem in 6.1 because the arrows aren't available. Is there a work around for this bug or do I have to use small text for these page label arrows to look right?

I must admit that I've never used the page labels display and it does look like a bug. You can fix it however. Select the tab control and choose Advanced>Customize. In the control editor, select the page label control and do the same thing. You should be in the control editor for the numeric control and then you can go to edit mode and enlarge the decrement arrow to make it the same size as the increment.

TimeStamp milisecond​s control in Labview

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TimeStamp miliseconds control in Labview