Merging Signals From Case Structure

Hello,
I am making a scanning program which requires several cases to be evaluated within two for loops. I've hooked up both conditions in a while loop, and I know that because of the conditions only one of the wires will be executed. In two of them I modify a parameter and one I leave it alone, but I am unsure of how to connect the three to the module on the right. Any tips?
Thanks for your help,
gordonj005
Solved!
Go to Solution.

When you drop a new case structure onto the block diagram, LabVIEW creates a structure with two cases by default.
To add additional cases, right-click on the case structure and select "Add case". You can either "Add case after" or "Add case before".
You can learn a lot by experimenting, right-clicking on things and examining your options, and using the LabVIEW help. Since it seems that you're pretty new at this (not knowing how to create additional cases was the clue-in), I'm trying to give you some tools for learning on your own. I'm not trying to be mean.

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How extract data from case structure

Hi all, I would like to extract the data from case structure, it's circled in red in the attached file. How should I do it? Thanks for taking your time to look at my post. Your help is greatly appreciated.
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bp.jpg ‏161 KB

Thank you guys for your prompt reply.
As u can see from the vi, there's an error, I need the values in the circled area to be passed on to the block ( Bundled by name)
Thanks !
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Is there a known issue with emailing from case structures

Hi,
I am working on a quality control vi for data coming in as a text string. I need to be able to have the vi perform a check with the responce to the check (true or false) will cause different steps to then be performed. I was able to get the vi to perform 1 check and email out if the responce was false. When I tried to add a second check if the responce was true, the vi would run without any errors but would not email out or would only email out from the first check even if the first check passed and it was the second check that failed. This was all done without case structures. I then started using case structures with the true responce leading to other checks but the false responce leading to an email generation. For some reason even a simple one check with the email generation happening in the false case will not work. There are no errors or anything, it goes through the whole process correctly but will not send an email. Please help!!
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Hi,
Here is the vi and the sample text file it calls for. You will of course have to change the path name. Feel free to call me if you have any other questions. Thanks
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410-326-7259
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Converting from case structure to arrays

I am working on a set up that write out 8 digit binary to a connector block. I had it set up with a case structure but there are over 40 different writes and it is becoming way too convoluted. I know it would be much easier to do this with arrays but I have no idea how to use them, please help.
Here is my current program:
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Here is a quick attempt to do everything with arrays. See if it makes sense to you. As you can see, the code is much simpler. (LabVIEW 8.0).
You should be able to adapt some of the ideas. Many additional simplifications are possible, for example you could calculate the port 0 values directly from the outputs of the upper Q&R function. Try it!
LabVIEW Champion . Do more with less code and in less time .
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Feedback node from case structure

checkLED.vi is my first rev of this. Then I realized I can incorporate the 345/348 selection into the case structure, which resulted in checkLED2.vi. However as soon as I did this, the feedback loop inserted itself. I don't understand why this happened and what it means. The string coming from the case structure is an INPUT to the two 34970 vis. There is no feedback going on here. If Labview sees this as feedback, why didn't it insert the feedback node in checkLED.vi?
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Look at the dataflow you have created by moving the strings into the case statement. The case statement requires data from the iteration terminal and from the VI in the sequence structure. The sequence structure requires data from the switch VI which in turn requires data from the case statement. This is a clear feedback situation that you did not have before.

Start event from case structure

I'm running my main programm inside an event of an eventstructure.
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placed inside another event.
Is this possible - would be glad if you have an example.

You are still completely misunderstanding the purpose of the event structure (see also my answer the other thread).
The main code of the program does NOT belong inside an event structure. What good is an event structure if it is tied up indefinitely inside one of the event cases???
An event structure is most useful for dealing with interactions by the user and must be ready to handle those at any time. It is not a tool to "save screen space" (whatever that means). If you are running out of diagram space, consider wrapping your code segments into subVIs.
LabVIEW Champion . Do more with less code and in less time .

Merging data from 2 schemas with same object structure into one schema

Hi
I want to merge data from 2 schemas in different environments ( say test1 and test 2) into 1 schema ( say Test_final) for testing. Both these schemas are having same structure, the data can be same or different.
What I did is that I took an export of schema on Test1 and then import it into Test_final. Now I need to merge/append data from Test2 into Test_final.
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Regards
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This approach might be better...
create table test_final
as
select *
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where t2.pk != tf.pk
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Cheers, APC

How do i output multiple arrays from a case structure to create one larger array

I currently have a vi that has one hardware input that i needed to take a measurement then be moved and take a similar measurement at a different point. To accomplish this i used a while loop inside a case structure. The while loop takes the measurement and finds the numbers i need while the case structure is changed per the new measurement location. I want to take the data points i have created in each case and output them into a single table. I assumed to do this the best way would be to get the data from each case into its own built array and build a larger array but I cant get the information out of the case structure so that it all inputs at different places.
thanks for your help
Attachments:
Array.vi ‏30 KB

Hi Ross,
attached you will find a solution for your table building problem.
I would suggest thinking about program design - having the same case content in several cases doesn't make sense. I also would not want my user to press several stop buttons depending on choosen measurement...
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome
Attachments:
Array.vi ‏45 KB

In the attached VI I dont understand why data from the inner case structures are not being transmitted to the array.

In the attached VI I don't understand why data from the inner case structures are not being transmitted to the array.
Thank you.
Solved!
Go to Solution.
Attachments:
TEMP.vi ‏25 KB

It took me some time to figure what you are trying to do but I think I have it now.
The SR is still required.
What is happening is your "Bundle By Name" is replacing all of the fields of the cluster, not just the value coming out of the case structure. So to maintain the cluster stuff you do in earlier iterations you can either...
1) Put the "Index array, Bundle by name, and Replace array" inside the case structure and ONLY bundle the value you are setting in that iteration. (as you will see Tim post shortly)
OR
2) Move the Index array before the Case, unbundle all of the fields and feed teh case structure and run them across the case so that ALL of your output tunnels come from the coresponding input tunnel EXCEPT for the filed you are trying to set.
Ben
Message Edited by Ben on 05-05-2010 01:31 PM
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

Case structure back and forth from LED

Hello, I'm trying to make a case structure switch back and forth everytime a boolean LED indicator goes off. I want case one to start when a button is pushed, switch to case two when an LED indicator goes on, then switch back to case one when that same LED goes on again, then case two the next time the light goes on, and so on. The LED is set to go on every ten seconds. So far i have the case structure in a while loop but im not sure how to get them to switch back and forth using this one LED. Any suggestions?

Then you have two asynchronous parallel loops, and you want one of them to receive information (Boolean) from the other in order to determine its state.
If the loop with the elapsed time contains nothing but elapsed time, then consider moving it to the first loop.
Otherwise, you should use a form of synchronization communication, such as a Notifier or User Event, to send data from your loop with the elapsed time to your loop with the case structure.

Switching from case to event structure

I once down converted some LV 7.0 code to 6.0 and it (automatically) converted an event structure to a case structure. When trying to upgrade some code to change a case structure to an event structure, I didn't see any means for doing that (a flat sequence, yes... event structure, no).
Is there a way to convert a case to an event structure -- if not, why not?
...Dan

No, the question is very valid!
The resulting code does not need to make sense immediately, but I have desired this functionality (=convert case structure to event structure) at several occasions. I have many legacy programs that were made before the introduction of the event structure. Some contain big case structures with many cases, one is the "idle" case which only contains a small wait statement, while others are executed if certain controls change their value. (Sort of a poor man's event structure emulation ). Upgrading this old code would require a simple replacement of the case structure with an event structure so each event case contains the code of one of the original cases, followed by a quick manual cleanup (assignment of the event triggers, etc.).
Without such a conversion tool, my code upgrade is major work, especially if there are many cases and dozens of shift registers crossing the case structure. Basically, I need to rebuild things from scratch.
Summary: It would be useful to be able to easily convert between event structure and case structure and vice versa using a "replace" command. I even remember asking for this functionality. I would use it!
LabVIEW Champion . Do more with less code and in less time .

Case Structure Ranges Determined From Input Variables

Hello,
I am trying to write a vi that will read in a random number, and depending on how close or far away from the intial given value it is, it will do something different to the value using a case structure.(Not positive this is the best way)
Ideally I would like to somehow incorrporate the value that is on the front panel from the user, into the different ranges so they are not set. Is there any way instead of using [ ..10, 11..15, 15.. ] I could use the [..(indicator - 5), (indicator-4)..(indicator +4), (indicator +5)..] as my three different cases? Or is that just crazy and I should be trying to use a different type of structure maybe?
Thanks in advance for the help,
KT

What if you would subtract the reference value before wiring to the case structure?
(assuming you are dealing with integers)
LabVIEW Champion . Do more with less code and in less time .

Cases programmatically from xml in case structure

I want the cases in my case structure to be updated programmatically from an xml file. Is this possible?

You can, but don't forget what Felix wrote - a VI can't programmatically change itself. You'll need a separate VI to modify the Case Structure you're working with.
This example gets a reference to the target VI, traverses for all Case Structures, selects the target by its label, adds a frame and gives it a Selector Label. You'll need to modify the last three VI Server nodes to accommodate your particular application.
Good luck.
<edit> take a look at my CaseSelect JKI RCF Plugin, it contains a bunch of Case Structure manipulation code.</edit>
Jim
You're entirely bonkers. But I'll tell you a secret. All the best people are. ~ Alice
Attachments:
contains case structure.vi ‏9 KB
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Concat strings from different subdiagrams of a case structures

I am using a case structure, which has about 8-10 different case and each case has a string constant. I want to show the strings in a single indicator. Suppose if 3 cases runs first then second and then third. Then the indicator should show
" first case
second case
third case"
initially indicator should be empty then as soon as the first case runs indicator should show " first case"
after finishing the first case when second case runs then the indicator should show
"first case
second case"
and so on..Please help me.
Solved!
Go to Solution.

$agar wrote:
Here it is attached with 3 cases........
Well, that does not look very useful. Try to scale it to 10 booleans!
Here is a quick draft how it could be done. Modify as needed.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
ConcatenateCaseStrings.vi ‏9 KB

Wiring inputs n outputs for case structure

Hi everyone...
I have a simple basic question...How to wired the correct tunnel for output in case structure.Because when I try to wire the build array to the case structure, It shown as white terminal....How how to make solid color terminal for output tunnel...Actually I forgot how to wire it correctly..so...I hope u guys can remind me again...thank u very much...
Attachments:
Cepat21.vi ‏43 KB

Hi Altenbach...
Thank u very much for ur
help.I'm always make a careless mistake.thanks to u guys.Now,I'm be able to display my
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to parse the value into string...something like that...
V = 238.25 I = 23.82 P = 5676.12
V = 237.79 I = 23.78 P = 5654.28
V = 237.35 I = 23.74 P = 5633.54
V = 236.94 I = 23.69 P = 5614.09
V = 236.56 I = 23.66 P = 5596.12
V = 236.22 I = 23.62 P = 5579.80
V = 235.91 I = 23.59 P = 5565.29
V = 235.64 I = 23.56 P = 5552.72
V = 235.42 I = 23.54 P = 5542.22
V = 235.24 I = 23.52 P = 5533.88
V = 235.11 I = 23.51 P = 5527.78
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V = 235.00 I = 23.50 P = 5522.52
V = 235.02 I = 23.50 P = 5523.40
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V = 235.21 I = 23.52 P = 5532.16
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V = 235.84 I = 23.58 P = 5561.99
Then I try to convert this string into numeric or dbl coz I want to
merge it with signal.So, it looks like complicated like u imagine.
Now,I have one other question.refer to my vi, I have used elapsed time
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Attachments:
build table1.PNG ‏36 KB
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Merging Signals From Case Structure

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