Implementing a nested block diagram

Hi,
I would like to draw a block diagram ( as shown in the below image )
The text on the blocks would be fetched from a well structured XML file.
If there is a node of type: A in the XML, corresponding green box, say A1 should be drawn and the a horizontal line should be added to connect the end blue box (Gp4)
Similarly, if there is a node of type: B in the XML, corresponding orange box, say B1 should be drawn and a vertical line should be added to connect the bottom (O/p B) box and the top box (Gp B)
Similarly, if there is a node of type: C in the XML, corresponding yellow box, say C1 should be drawn and a vertical line should be added to connect the bottom (O/p C) box
What is the best & easier way to implement this diagram ( HTML, Flash, Flex ) ?
- Sen.

Did you ever figure this one out? I have been tasked to develop something to look like a block diagram as well. Do you have any tips or recommend any components? Thanks

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I need block diagrams for audio processing effects such as echo,flanger,vibrato,chorus for implementing in labview?

i need block diagrams for audio processing effects such as echo,flanger,vibrato,chorus for implementing in labview? pls i need it very quickly........

Hi komalamani,
i need it very quickly...
So you better start coding soon!
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Group block diagram objects

I'm almost certain this question has been asked before, but my searches are coming up empty-handed.
Why is it not possible to group objects on the block diagram? I'm using 8.2.1, so if this has been implemented in a later version, you have permission to slap my wrist and send me to the corner for not paying attention.
I think I recall the option being discussed in conjunction with the new "block diagram clean-up" feature of 8.6, but I think the general tone of that was that it would be cool to group objects and have them treated as a single object when cleaning up the code.
I have some code which is generating a lot of user events, and when changing datatype (Typedef) it happens that I need to re-arrange things so that nothing is overlapping. This is a right royal pain without being able to group the event data constant and the create event node together.......
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livermor wrote:
Has this been achieved yet?
If you like this idea you should suggest it on the idea exchange board.
Personally I don't really know how often I would use this, or find it useful but others might.
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If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.

LabVIEW exits while editing block diagram unexpectantly

Hi all, while editing block diagram in LabVIEW 2010, I have experience some strange behaviour from the software. I have two monitors, one has the front panel of main VI and the other - block digram of the specifed VI. When I switch from block diagram to front panel, and vice versa, every now and then the LabVIEW exits unexpectantly without the notice. Upon restarting the program again I get the undo.cpp error. I have attached the error log for my clarification on the type error that I am dealing with. Does anyone have any ideas why this is occuring? Thanks in advance for your help.
Viktar
Attachments:
lvlog2010-09-17-09-35-46.txt ‏2 KB

Thanks for all the responses.
I was using an existing VI as template to create a new program. There were nested loops in the original program and I needed the logic for the outter loops only for the new program. After deleting many objects in the 'yes' case in the inner loop, I was left with many loose wires in the 'no' case. And that's when my problem started, when I was trying to delete them. Yes, I tried rebooting my PC and that did not help. The problem seemed to get progressively worse, as crashing started to happen even when I was only selecting a wire. But somehow I was later able to select one wire, delete it, and did a save. Then I went to the next wire, and so on. My program is now cleaned up and I'm ready to go on. I will experiment more when the problem returns.
Thanks again.

Simple moving average block diagram

I am reading https://decibel.ni.com/content/docs/DOC-5041
and since I only have access to LabVIEW 6.1, I am interested in the block diagram JPG.
Unfortunately, I am getting an error when I click on the JPG.
Can someone help me out by posting it?
Solved!
Go to Solution.

This seems like very clumsy code. For example if you later want to average more or fewer elements, you would basically need to rewrite the code from scratch. It is not scalable! Why would you need six diagam constants (DBL zero)? All you need is one and branch the wire. Why would you wire N of the FOR loop when autoindexing over the array? This is very crude beginner code that will only teach you bad habits.
If you don't have access to the "ptbypt mean", you can make your own. Here is an old example (see lower part of code. The ptbypt version above it is just used to show that it gives the same result)
Try to implement it. To change the number of points to average, all you need to do is change a single integer. Since the mean does not care about the order of elements in the buffer, all you need is replace the oldest with the newest at each iteration, no need for rotating or shifting, etc.
LabVIEW Champion . Do more with less code and in less time .

Close front panel but leave open block diagram

Is there a way to do this? I would like to have my block diagrams of a few subvi's open but front panels closed so my task bar isn't so cluttered. It's not a big deal, I was just curious
CLA, LabVIEW Versions 2010-2013

Chris_VH wrote:
No current way unfortunately.
A colleague and I actually just put in a product suggestion for this yesterday.
So if they fix this do I give you or them credit for the solution?
CLA, LabVIEW Versions 2010-2013

I created boolean references in my main vi block diagram and copied them to my sub vi front panel. when wire my reference in my main vi to one the input node of the sub vi the wire is broken. the error says its a class conflict why?

i created boolean references in my main vi block diagram and copied them to my sub vi front panel. when wire my reference in my main vi to one the input node of the sub vi the wire is broken. the error says its a class conflict why?

Expanding and clarifying what BJD said;
After you create the temporary sub-VI that BJD mentioned, open its front panel and copy the reference control that LV created when it created the sub-VI.
This reference control will be correct class etc that you need. Use the control to replace the original control that you were attempting to wire up.
The technique of "create sub-VI...copy" always works for me.
There is one more thing that you should watch out for.
The mechanical action of the boolean can not be set for latch action when attempting to read the value using a value property node.
Trying to help,
Ben
Ben Rayner
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Block diagram wont open properly

I have written a big labview program for my application. I have been workig on it for 6 months. I keep adding the peice of code every day and save it with a new name every week.
At one point when I added some code into my program, the block diagram started acting weird and wont let me work on the program easily. For If I add an add function, it would take time and insert this function a couple of inches away where I pionted my cursor. Another issue was that; if I add a while loop or for loop or any other structure it would take time and one added it would add a couple of inches away and expand the main program window (Block Diagram) too.
since then, I started using my company's laptop to develop the code. I have no issues with that lap top till today.
But now when I tranfer this program back to my desk top. It wont open the Block Diagram and wont let me edit it. When I try to open the block diagram. the window appear black out and the LabView stops working.
Is this issure ralted to the graphics of my compute or any thing else? Please help me. Thanks
Mansoor

There is a maximum size that a VI can be. What that exact size is I don't know. It does sound like you have one HUGE VI. If that is the case you really need to think more about using subVIs. It will make your program much easier to maintain and extend.
Also, rather than renaming it once a week you should consider using source code contol. Even if you are the only developer it is a much better way to manage your code. SVN is free and very easy to set up. If you do use source code control make sure you separate the compiled code from the source code. This is an option in the VI properties.
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How can I open a vi and show the block diagram?

Hi,
I am opening an vi using "Open VI Reference" and "Invoke Methodpen FP", but I want to open the vi and show the block diagram, but I haven´t found any method (Invoke Method) to do that and any property.
Any idea?
Thanks!
Gracinda

OK, I can come up with a reason. I have written a program that will search the entire VI Hierarchy of a program and update all of the descriptions for all VIs with the top level program part #, the name of the top level program that the VI is used in, the company copyright info, the ITAR notice, company address, the name of the engineer performing the update, along with the date and time. This will also place as a background image on all the VIs, a watermark of the company name, legality stuff and the copyright. It works very slick in that if there are thousands of sub-vis, such as what I'm working on now, it goes through all of them, makes sure the data is there as per company policy without having to open every one of them look at them and update or not whichever the case may be. The one portion that is tough is that the program will detect if there is a description written about what funtion the VI performs and if there is not a description, then it pops up a dialog requesting the user to write a description. The problem is that without looking at the block diagram for the VI, it can be nearly impossible to write a description for the functionality of the VI. So is there a way to programmatically open a VI, show its block diagram (this would only be in the case of a missing description) and then upon completion of the updates, close the block diagram? (I already open and close the VI programmatically in order to read the VI DESC and update as needed, but that is in the background and of course you can't see the block diagram).
Thanks,
Dan

Urgent Help! How can i execute in the same block diagram two separate labview codes each one with diferent execution timings?

Dear All.
I have 2 application progrlams in the same block diagram. the intention is to use the 2 programs at different excuting time for different application, and each have stop and start button ofcourse i will have master stop. But when i run the program, it only works one program at time , that is the 1st block which i make it active only , when i tried to make active the second block it will not work, only works when i stoped the1st one. So, this it to request ur hlep how can i solve my problem. here i have attached some of my program.
Regards!
Solved!
Go to Solution.
Attachments:
2_block application.vi ‏14 KB

Usually you set up a task that has all the channels from all the modules configured. When a loop starts it reserves that task and the cDAQ can't be used by other loops unless you start and stop tasks.
You can have one loop acquire all the data and if you want certain channels to go to other loops you can use the producer/consumer design pattern. If you wanted a third loop you would add another queue and the third loop would dequeue that data. See attached.
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Attachments:
prod-cons.vi ‏69 KB

Error cluster constant appears different in two locations on a block diagram

I am a newbie to LabVIEW. I have taken Core 1 & 2 and Machine Vision and I have not com across this before.
The image on the right is obviously an Error cluster constant used in the block diagram to create an Error cluster and wire it to an error out terminal. As far as I can tell the image on the left is about the same thing, but why does it look different? The different appearance causes raises a concern that there is a difference in behavior that I do not understand. LabVIEW help suggets that both are Error constants. When I create a new error constant, it always ends up appearing like the right image above. I have not been able to create someting looking like the image on the left.
Could someone please confirm what the image on the left is on a blck diagram?
Thanks,
Bill
Solved!
Go to Solution.

The image on the left is an error cluster control. It has a front panel presence and can be set either via the front panel or through a property node or local variable. The image on the right is an error cluster constant. It is a static value.
Mark Yedinak
"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
Wreck of the Edmund Fitzgerald - Gordon Lightfoot

In block diagram connecting wire getting blur while saving the VI in LabVIEW 2009

Hello,
I am using Labview 2009, And while I am saving a simple VI connecting wires are getting blurry. What could be the problem?? Is it affect my program while running?
Solved!
Go to Solution.

Go into Tools>>Options, select the Block Diagram page and find the section called Constant Folding. If the CF for wires check box is checked, then this is most likely the reason. You can uncheck the check box and it won't affect the way your code runs.
If this isn't the case, you should upload an image of what it looks like.
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How can i avoid to see the source code when any user open block diagram third time without password

i have a probelem regarding source code control. my problem is that when user open block diagram of any sub vi in vi. i would like to make a such a vi which source code can not open after seeing the block diagram thrice time and i dont want to make password to see the block diagram so what can i do ?
give me the perfect solution for this type of problem.

First protect you diagram
create a tap on your FP and create a picture of your diagram and put it on the second tap
DON'T expect answers if you only want perfect one's
Greetings from Germany
Henrik
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Is there a way to add shapes to the shape library, and does anyone make a shape library for electronic block diagrams?

Hello!
I'm trying to use Pages or Keynote to make electronic block diagrams. The shapes library looks like it would be perfect for the job, but the shapes are limited. I know I can make a custom shape, but I live with slight brain damage, which means the mouse is NOT my friend. If I try to make custom shapes, they look like a kindergartener's scrawl, so that's not a solution.
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I would gladly pay some reasonable fee for electronic shapes, such as amplifiers, mixers, oscillators, etc. if someone made them. But from the help file I can't even see a way to add those shapes to the Apple shape library, so I'm not sure, other than copy and paste, how to handle outside shapes. Copy and paste is pretty labor intensive anyway, but if it's my only option, well, so be it.
Any suggestions? Aside from Visio, that is...
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Hi Jim,
When you say the "Apple shape library" do you mean the Shapes button on the toolbar in Pages?
I don't think there is a way to add to the Shapes in Pages. However, you can create a custom template with shapes that you frequently use. Save a document with your shapes then Menu > File > Save as Template...
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I don't use Keynote, so I may be missing something in your question.
Regards,
Ian.

Saved block diagram wont open

I am a new labview user so this may be obvious, but I have a problem nonetheless:
I have drawn a simple program and saved it but when I open it again, only the front panel opens and not the block diagram as well, which I wish to edit. I am openning labview on the same machine, same version etc. what do I need to do to get this working properly?
Thanks to anyone for their help

Hi Dougonlabview,
Just press Ctrl+E. This will bring you to the diagram. Pressing Ctrl+E again will bring the front panel back on top.
Regards,
Mathieu Steiner, Test System Engineer, Safran Engineering
CLD, ISTQB

Implementing a nested block diagram

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