Kurt Friday

I've been playing with 2009 today and I'm impressed, I love the ability to now build by ref objects using Data Value Reference and the in place DVR Read Write, this is brilliant.

I've been playing with an OOP framework and I've knocked up a simple demo. Have a play

LVOOP2009.zip

Hello,

I want to format excel cells to text, to prevent excel to convert 11E6 (text) to 11+E6 (Number).

I use the office generation toolkit.

What do i fill in the "Excel Set Cell Format.vi" to get this result?

Thanks

Hey

I had a play with it and at first is frustrated me too, but I found a bit of a hack. The format code you need to use to force text is @

However if you write your text before you format the cell and a cell has 11E6 then Excel will auto format it because there is no format set, then if you format it to text you just get 11+E6 as text. But if you format the cell before anything has been written then the cell essentially doesn't exist or hasn't been allocated and the toolkit throws an error.

The way to do it is write an empty string constant to the desired cells, write @ as the format code then write your cell ie 11E6

The following is an example that demonstrates this.

That was only the start...

Attached what it was created with.

No description, no comments, no even icons - I warned you.

Very cool, looks like a Dr Seuss application.

Thanks very much Kurt Friday.

Very nice reply, i have never worked with this, but i will try to adapt it to my situation and see if it works. Still, there's something that i wanted to ask you before, it will run that script but what if i want the user to fill those values? Because i have already done, 1 VI full with validations for the parameters introduced by the user.

Hope you understand me and that you keep in touch. Thanks once more for your wonderful support. =)

Hey, no problem, I enjoy tinkering with this stuff anyway.

I've modified the demo so that instead of reading a script from file it builds it directly from a sequence of ramps. Each ramp is built from a template script which has hotnames in it for rate, setpoint, wait and ramp number. As each ramp is built the hotnames are substituted for their actual values which come from the user defined list. After the script is built it gets sent to he consumer to be processed.

I've updated the Packages.vipc as I also implemented a read config from ini file as well.

TempControllerDemo_V2.zip

This is what I see when I click on "Insert link":

By trial and error, I figured out I'm supposed to enter the URL into one or the other of the white boxes, and then select the blue box, and the link appears in my post.

Something similar happens if I click on "Insert image".

I'm running on IE6, if that matters. No, I can't upgrade...

Cat

I saw the same thing when I tried to do my first post. But then I switched to Firefox and all OK.

Are they supersecretprivate agent VIs?

Ha, no, more like a secret squirrel that I send in.

I'll be releasing GD source code soon under BSD, but if you want to look at the Agents take a look in the Agents folder. You will see for each version of LV a folder, in each folder is a set of vi's that perform the scripting and other operations not available from runtime, to unlock them the password is scigoop

I know I am. There's not much chance to see that happening since it might make it possible to program in LabVIEW from an executable.

But you can't keep someone from thinking about it.

Its possible, GOOP Developer is a LV7.1 executable that communicates to any version of LabVIEW development environment from LV6.1 up and gets it to perform scripting operations. It does this by using agent vi's which are called into the development environment by the executable to do the scripting.

Thanks for your reply Kurtis,

But tell me, should it be something like this? What should i wire in the rate value of the Ramp Status.vi ? Because in my VI, i want the Ramp to start from a user defined Minimum and not from the Ramp default minimum. Still, how should i do it, if i want to add more ramps? How do i give temperature limits to it? Making it run from for ex. 10K to 20K, and in the end i make a delay and only after start another 1 from 30K to 40K.

Please help me out with this, i'm getting out of time with this..:S

Thanks for your support.

I've knocked up a bit of a demo that I think will help you out. Its based on a Queue Driven State Machine architecture that executes a script.

I've written a simple script that will demonstrate how it works, shown below.

status:Test Start

wait:1

temp_ramp:0.5

temp_setpoint:10

status:Waiting for ramp 1 completion

temp_rampcheck

wait:60

temp_ramp:1

temp_setpoint:20

status:Waiting for ramp 2 completion

temp_rampcheck

wait:60

temp_ramp:1.5

temp_setpoint:30

status:Waiting for ramp 2 completion

temp_rampcheck

status:Test Complete

End

When executed the script tells the system to display the status "Test Start" then 1 second later it sets the ramp to 1 deg/min and the setpoint to 10 deg, updates the status to display "Waiting for ramp 1 completion" and then waits until the ramp has completed when it hits the "temp_rampcheck" command. Once the ramp is completed it waits 1 minute and then moves into the next ramp sequence, ie ramp up to 20 deg at 1.5 deg/min.

When all ramps are done it then displays to the user "Test Complete"

Have a play, this is only a demo but you can expand your other HW into it and build your system from it.

The demo implements OpenG library components which I have packaged. Use VI Package Manager to unpack the Packages.vipc file.

TempControllerDemo.zip

Hope this helps

why when i connect to web that i've make through web publish at another computer don't works?

tanx

Could you provide more detail?

I'm not quite sure what the issue is.

According to my step into oop, I would like to start with a instrument driver for a DMM (agilent 34901A), but to do it right I have considered to make a instrument class that cover all my instruments (then the DMM would be a subClass). I was thinking of something like this:

Class: Instruments

SubClasses: DMMs

SubClass: AG34901A

SubClass: NI4070

etc.

SubClasses: Counters

SubClass: Agilentxxx

SubClass: Nixxx

etc.

etc.

Is this the right way

Does anyone got a oop instrumentdriver they would share (for learning)?

Your class hierarchy looks fine.

I don't have any LVOOP based instrument drivers I could post, but I'm sure someone has one kicking around.

Yes, I had the subpanel before. The Examples made it easy for me to get the subpanel and run the VI.

However I did not find a way how to let the VI react to other inputs of my Statemachine (which can change any time).

About my Master/Slave VI:

The Master notifies the slaves depending on elapsed time. The Timer also has a Pause functionality, which will be activated if the user press the pause button or opens a machine door. So I need to be able to give the Master/Slave VI a run/pause input. This was easy with parallel loops, because they are not running until I stop them but rather are controlled by calling them again the next iteration of my Statemachine.

The only way I can think of is to create a LV2 Variable which will be written by the Statemachine and then read by the Master/Slave VI. (wouldn't this be polling again?) And the same procedure for the outputs of the Statemachine, which will determine the next state.

Or is there a simple way of running a VI in a subpanel but at the same time treating the input/outputs in the same way as a SubVI?

Thanks,

Angelo

The best way to do what you want is to use a queue. Input the queue into your Slave by either using the VI Server Control Value Set method or use a named queue, when pause is hit or elapsed time occurs it messages into the Slave. If you use 2 queues queue 1 can message into your slave from master and queue 2 can message into the master from slave.

Have a look at Queue Driven State Machine Architectures.

Another way that might work for your use case is instead of creating and destroying the notifier in the Slave, create it in the Master and give the Slave a reference, that way the Master can message into the Slave.

LAVA search is just a joke.. I gave up using it, try "site:lavag.org OOP Benchmark".

Maybe the post you're referring to is the post 13 of this LAVA 1.0 thread (in google cache)

Cool, that's the one

Hello,

I am working on a machine control. I figured out the best way to handle the overall functionality with a Statemachine.

The core functions includes two subsystems controlled by time. So I made a SubVI with parallel loops that were polling the state of the indicators whether to run the subsystem or not.

As I know, polling loops are not best practice, especially since two loops individually poll the same indicators. Then I changed the parallel loops into a Master/Slave design.

That I like very much. Downside, I cannot run the Master/Slave as SubVI, because the Notifiers are killed before they execute, right?

What is the best way to do with this situation? Go back to my parallel polling loops?

Running the Master/Slave and showing it in a Subpanel won't give me the outputs (indicators) and won't let me start/stop it, right?

Thanks for any ideas, or advice!

-Angelo, still Newby ;-)

Hi Angelo

Definitely the Master Slave architecture is superior to polling, don't go back.

I don't know why in your case you can't call it as a subvi and display in a subpanel, the Notifier shouldn't be killed, take a look at the attached demo.

MasterSlave.zip

I just built it up from a LabVIEW template in 8.5.

If you need more help post some code up that replicates the issue.

Just having a quick look at your code and the driver and off the top of my head my suggestion would be to check the status of the ramp using Ramp Status.vi. If ramp is done then load your next ramp using Configure Ramp.vi and then call Configure Setpoint.vi. If your rate is the same then you only need to call Configure Setpoint.vi

Hi all

I am starting to look at OOP in LV (8.2.1) and been looking through the examples.

I wondering why the oop solution in the example "Board testing" is much slower than the traditional solution?

In my company we would chose the traditional solution regarding to speed!

regards Bjarne

Hi Bjarne

I just ran the two demo's on my machine running LV 8.6.1 and the difference between the Traditional and the LVOOP implementations is that the LVOOP solution takes 100 msec longer to test 148 boards, each board having 13 tests. So 0.7 msec per board overhead using LVOOP, not too bad

I tested under 8.2.1 and I get 350 msec to do the 148 tests, so a bit longer, I suspect LVOOP has been optimized a bit since then.

Note that these tests were performed on my crusty but trusty 5 year old Dell Inspiron 1150 2.4GHz Celeron laptop.

For me, the benefits of implementing LVOOP would greatly outweigh the performance hit, especially when I wanted to implement new tests and new boards. The code is simpler and self documenting, easier to farm out within a team of developers and easier to debug.

I can see some value, or curiosity in who votes your posts, but I think many would like to be anonymous in their voting.

I can see situations where posters get upset that certain users don't vote their posts, or that users will vote because they might feel that the poster will be upset that they didn't.

I personally like it the way that it is.

It's obvious you are not a marketing guy . What marketing guy would post both advantages and disadvantages in the promotion of their product? But it is definitely a very sympathetic treat.

Rolf Kalbermatter

Ha, no, I’m just a LabVIEW geek.

I think if I was a Marketing freak then GOOP Developer would never have seen the light of day. If I’d done a market analysis and income projection against development cost and blah blah blah at the start then the outcome would have been “Are you nuts!”.

But I’m glad I didn’t because it wasn’t all about cash, I basically did it because I’m interested in OOP and at the time it was my mountain to climb, and working with Jim Kring on the OOP Templates and refining GD was a lot of fun. The entire experience has made me a far better LabVIEW Developer than before I started.

I think the best marketing is honesty, if you inform your market of the pro’s and cons of your product then people will make an informed decision and be happy with their choice. I haven’t had an upset or disillusioned client, so seems to work.

I remember a very good manager I worked with, his mantra is “Engineers and Accountants should always tell the truth”

I’ve tried to find an old post I did where I raced all the different flavors of OOP, but I can't find that post, weird. I have the benchmarks which I could re-post if anyone is interested.

1) I'm using NI-DAQ legacy, the Trad DAQ due to the antiquated sub-VI's in the VI of interest.

2) I'm using a PCI-6011 to log from a BNC 2090.

3) The Test Panels read perfectly... maybe even TOO perfectly.

4) What's a DAQmx task?

5) No error; but no viable data either.

6) I haven't tried plugging in the breakout device into the other PCI card only because I don't think the pins line up.

7) Thank you!

~AA

Hi Adam

You mention that you haven't tried plugging in the breakout device into the other PCI card only because you don't think the pins line up. Do you have a PCI-6110 in both machines?

You need to check if the traditional NI-DAQ driver supports your hardware, to get your NI-DAQ version open up MAX and expand the tree to display Software, down the bottom you will see Traditional NI-DAQ as show below.

Then take a look at this document on the NI site which lists hardware against driver compatibility.

Also you ran a test panel, which will work because they are based on the DAQmx driver, which is the latest driver architecture so it's not surprising that it works. But what you need to do to test your case is make a Traditional NI-DAQ Virtual Channel and then test that. To do so right click on Data Neighborhood to create one. If you can go through the process of creating one and then test it, then it should work in your application. If not then there is likely a compatibility issue.

You mention that an error is not being returned, do you have all DAQ vi's error flowed? If so and you are not getting an error then I would suggest the problem is electrical or connector issue.

To find out more about DAQmx and Tasks have a look through the following tutorial.

Once you get over this issue I would strongly reccomend taking the time to understand DAQmx and how to write measurement code in LabVIEW to use it, its powerfull stuff. Perhaps then look at how you could edit your code to use it.

Hey Vugie

I've just been playing with VIpreVIEW, this is amazing!

Well done, its really cool

• GOOP Developer (SciWare - never tried it, don't know anything about it)

Awww, not even worth a look at Chris.

To further assist in avoid confusion (or creating more of it), "GOOP" is a registered trademark of the Endevo corporation, and is usually only used when refering to their implementation of by-ref OOP in LabVIEW.

At the time I had no idea that “GOOP” was a registered trademark of Endevo. I found out later that it’s was a registered trademark in Sweden when I worked with the guy who developed Endevo GDS. I did think of changing the name to POOP (PrettyCool Object Oriented Programming) but it didn’t have the same ring about it.

I'm not sure if Sciware's "GOOP Developer" actually develops GOOP, or a different LabVIEW OO implementation.

Basically GOOP Developer is a code generation wizard and class manager that builds your classes from Open Source OOP Templates. It doesn’t implement LVOOP because they were developed before then, but they support Inheritance, Active Objects and you can run it on RT platforms.

In my opinion, considering that LVOOP has come along way since it was initially introduced, my recommendation is that you take a look at Endevo's GDS, it’s beautifully implemented. I’ve had the privilege of contributing to a design pattern for Active Objects and to some of the mechanics of data locking.

If I'm reading what you're suggesting correctly, it will only work if the terminal is in its Event Frame. Good solution if that use case will work for you though.

Thanks

Ahh, true, but I agree not much use for what you want to do.

I had a bit more of a play now understanding what you want to do and I can't get the user event case names attached to a particular terminal either. Yair is right, doesn't look like its exposed.

I wanted to be able to right click a control or terminal and have it look up if it's attached to a case in an Event Structure and display that case.

What you can do is get all frames, then for each frame get all objects, cast all objects to Control Terminal ref and keep the refs that do cast and get the terminal label text. Now you have a list of terminal refs against frame refs by terminal label text. If you search for your control by label text you can get its Terminal ref and also the ref of the frame that it belongs to.

hi, i want to bulid ecg signal with labview but not with simulation. can anyone help me to make this?

tanx

Here is a great article in NI Devzone that you might be interested in.

http://zone.ni.com/devzone/cda/tut/p/id/6349

Also take a look at this discussion

Hi,

Thank you.

I installed the driver, and there are some examples.

How can I find more examples.

Feri

+++++++++++++++++++++++++++++++++++++++===

Hi Feri

I'm not sure where you would find more examples for this particular instrument. Were you able to run the examples and get results?

What type of examples are you after?

sorry to bother you...

thanks a lot...

No problem, happy to help