Best way to implement this code in labview

Hi
What is the best way to implement this code in labview programming.
I have an analogue input which triggers a boolean light when it reaches a certain voltage. but at the same time i would like it to enable two other outputs one for a set period of time and the other stay on until another statement becomes true.
For example
case 1:
Set output high
Delay(2000ms)
Set output low
Case 2:
Set output high
If statement 2 is true
then set out put low
if not then repeat until statement is true
Thanks for your help

Hi David,
The code you posted will work, although note that the front panel becomes 'unresponsive' - as changes in the controls are only read once per iteration. The wait function is an example of an execution timing VI, however if we want to do software timing (like a 2 hour wait) - we should use software timing VIs.
Check out the following example (note we can stop execution during run-time):
Regards,
Peter D
Attachments:
SoftwareTiming.vi ‏26 KB

Similar Messages

Event Structures-best way to implement this UI?

I am trying to write a VI to control & read data from 4 different "channels" (each measuring a DUT) at once. I have written all the VI's for initializing instruments, communicating with the devices (VISA, GPIB), setting bias, reading data, etc...that has all completed. I just need to write the overall program with the user interface to allow the user to control these 4 channels & display the measured data.....as it turns out, this is the tricky part! My head is spinning from trying to figure out how to handle all the possible events.
Basically for each channel, I want the user to be able to
-enable/disable it for measurement (e.g. if there is no device loaded in Ch.3, we don't want to measure Ch.3..maybe disable/grey everything)
-set bias conditions (only if channel enabled). Allow user to change bias "in real-time" by increment/decrementing (e.g. incrementing from 5.00 V to 5.01 V, for example).
-turn biasing on/off (again, only if channel is enabled)
Also, I want each channel to display its measured data (e.g current, temperature reading)..every second or so. No graphs or anything fancy (for now! ), just numeric indicator.
Honestly, this all sounds so simple but I'm having trouble figuring out the best way to implement this, due to the fact that 1) there are multiple channels needing to be monitored for events 2) large number of user events that could occur (seems like at least 4 per channel - enabling/disabling, turning bias on/off, incrementing/decrementing bias values, etc ), Also the if a channel IS enabled, i want to be continously reading/displaying the data. What is the best way to handle this? Should i have 4 separate while loops, each with an event structure to handle events for that particular channel..or will that give me grief somewhre?
Also, I have another nagging question. Pretty much all the examples I see re: Event Structures and booleans involve latched booleans, eg. buttons that are just pressed once and pop back up...e.g. buttons you press to tell it to complete a task (e.g. "Acquire Data" or "Stop") , and once it's pressed it's over and reset. In my case, some of the booleans would not be latched...e.g. the "Enable Ch.2" button would be 'TRUE" as long as i want Ch. 2 to be read....does that make sense? Then, say hours later, if i did want to disable that channel, i would change it to "FALSE" and while that would be an "value change", the new value would not be "TRUE"..does that make sense? So not sure if that would be dealt with the same way in an Event Structure.
Hope this all makes sense and many thanks in advance for any help!!!

You're halfway there. I'd say the best solution is a producer/consumer structure, the event structure is used to generate queued commands to the consumer loop.
All data is handled in the consumer loop, where you among other things have an array of clusters of channel/instrument settings. (I usually have several cluster, one for test data, one for instrument settings, one for general settings and so on)
The event structure can have a 1 sec timeout, in which you queue up a Measure command.
In the consumer, in the measure state you loop through your instruments and if enabled you measure them and update their indicators.
The general (smart) way to setup the queue is with a cluster containing 2 elements, a typedef'd Command and a variant.
This way you can send data with the command in any form which is then interpreted in the consumer.
If, e.g. you press the Enable button on a channel, you can enqueue Enable and the channel number.
/Y
LabVIEW 8.2 - 2014
"Only dead fish swim downstream" - "My life for Kudos!" - "Dumb people repeat old mistakes - smart ones create new ones."
G# - Free award winning reference based OOP for LV

How to implement this code in labview?

How do implement this pseudo code in labview? Please keep in mind "a" and "c" in the code below ARE VARIABLES
for i =0 to i=maxvalue
if i <= a
output = output2
else if i > a AND i<=c
output = output2
else if i < c
output = output3
else i = d
output = output4
I understance i can use a case structures and modify the label, but i do not know how to make the label dependent on a variable value.
Thanks

Try an array of boudaries and use threshold array. See this old example:
Now just iterate over an array of values using a FOR loop.
LabVIEW Champion . Do more with less code and in less time .

Best way to implement a simple read of multiple stings from a db

Hello guys,
I am trying to read a collection of countries (Strings) into a collection inside a Movie object. The countries reside in a separate DB table with a FK referencing the Movie.
My questions:
1) What is the best way to implement this? Do I need a seperate entity 'country' ? Is there a general way to read many strings into a collection?
2) the countries list does not have to be updated, only read. How do I make sure it is not persistent?
I have noticed that in my JPA implementation (in netbeans) I do not have something like CollectionOfElements (that is present in hybernate).
Thank you,
Marek

>
My questions:
1) What is the best way to implement this? Do I need a seperate entity 'country' ? Is there a general way to read many strings into a collection?
Probably yes, you need to have one entity for country.for getting the right answer, Post it here - Enterprise Technologies - Java EE SDK (http://forums.sun.com/forum.jspa?forumID=136)

The Excel-Mania - Best Ways of Implementing Excel-Like ADF

Hello people, good afternoon!
I would like to share with you a doubt i have implementing complex, matrix-like forms in ADF. More often than i'd like to hear, users ask for input forms that closely resemble Microsoft Excel, where the dimensions are layered both vertically and horizontally, and the intersection between them must contain an input or output component, allowing themselves to rapidly input the data they need or to create a web version of Oracle Reports' Matrix Report. Some cases are:
1) The user wishes to associate the employees (located in table EMPLOYEES) to the projects (located in table PROJECTS) in a screen that lays out the employees as columns and the projects as rows in a table. The intersection between them must contain a checkbox, which will insert a third record when selected, on a table called EMP_PROJ, which associates the employees to the projects.
2) The user wishes to input a timecard in a time control system. This system must have a screen that shows the days in the week as columns, and the projects the employee is working on as rows. On the intersection, we must provide an input text where he will enter the hours he worked on that specific project on that day.
3) The user wishes to see a screen that shows the Open Auctions they have in a Purchasing system as rows in a table, crossed with the suppliers that have bidded on these (as the columns). The intersection must contain the price each supplier bidded on each Auction.
As you can see, i run across this requirement A LOT =). And, as much as i have polished my "Web-Like-Applications-Are-Not-Like-This" and "You-Are-Not-Working-With-Excel" speeches, our beloved users never learn ;)
Nevertheless, i have been looking for a consistent way to implement this behavior, and i have found some options along the way. I would like to know your impressions on this matter, and if you have any "Best-Practices" that you imagine for this case.
CASE 1: Creating a Dynamic, On-The-Fly View Object by using ADF BC APIs and using af:table component to do the trick on the page
PROS: Less work in the View layer, Preservation of the Table CSS Layout (very nice blue header and light brown cells)
CONS: A LOT of work on the BC layer, creates an awful lot of View Objects, and generates tons of java code on the Application Modules.
CASE 2: Creating the model as usual and working with repeating layouts on ADF Faces (for example, enclosing an af:cellFormat on an af:forEach to repeat each column)
PROS: Simplifies the BC layer, making it much cleaner and maintainable.
CONS: Loses a lot of the declarative wonders of ADF Faces and also the CSS Layouts, since we are using cellFormat, rowLayout and tableLayout instead of table tag we have to manually apply the styles to the columns and rows.
Of course, both implementations take an awful lot of time. Any other implementation styles are quite welcome (ADF Wizards, step in!)
Anyone wants to discuss better ways of doing it?
Best Regards,
Thiago Souza

Well, you could do the following:
1) Create a stored procedure that assembles the data into a rowset with rows and fields like the format you want.
2) Create stored procedures that handle insert, update, and delete.
3) Create an entity object definition with all transient attributes. Make the attributes match the elements of one row.
4) Override doDML() in the entity object class to call your procedures (the doc explains how to do this). You might also need to do a bit of research and figure out if you need to override some other method so you can report rows with transient attribute changes only as needing posting. (getPostState(), maybe?)
5) Create a view object definition with entity-derived attributes based on your EO attributes.
6) Override the appropriate methods to call your data assembly procedure rather than execute a query (this is also in the doc).
Still kind of kludgy, but it keeps your business components pretty clean, especially if you use framework classes to do most of the work for you. (I have a partial example of how to do that here.) Of course, it keeps your business components clean by moving the real work to the DB, but some people find that more maintainable that a kazillion business components.
Hope this helps,
Avrom

Best way to implement an EULA popup (imprint) in RH 9

Hello there ,
I have a question about RoboHelp 9. The fact is my help page is divided into 2 iframes.
A left sidebar iframe containing a navigation menu, and a right sided iframe, the main one, containing the data. (index, content, ...)
The fact is I want, when the user load my helpdesk, to pop up a message, asking him if he agree to the legal terms of our society (EULA).
If he answer Yes, the popup is closed, and he can navigate freely in the menu, but if he answer No, I want him being redirected on our official website.
Is there a simple way to implement this kind of popup, with the following features :
focus locked on the popup (the user cannot naviguate until he didn't agreed)
the redirection have to take over the whole window, including the iframes (because if he is redirected only on the main iframe, he still can load pages from the left sidebar menu)
I tried :
to use BSSCPopup(), but it loses focus as I click outside the popup, and it cannot be closed properly.
I tried to use jQuery, but RoboHelp don't appreciate the library, and reformat the code (impossible to make it works).
I tried to use simply javascript, was the best results, as I could keep the focus, close the popup, but the redirection was always made on the main iframe, whatever I tried.
Thus, that leads me to begging for help, 'cause I just don't get why it's that hard to implement this in RH.
Thank you for any suggestions or help

Actually, it is a bit more complex than you think. For example, when the user leaves the page and returns an hour later, you don't want to show the popup (overlay, because you can close a popup) again. This means that you need to save the acceptance in a cookie. The content files should also check whether the terms are accepted and whether the navigation frame is not shown. If the navigation is not shown, the content must show the EULA acceptance overlay as well.
Note that there will be a way to circumvent this with web development tools if you are using JavaScript (just disable the overlay with the tool). Or even the possibility that JavaScript is turned off. The only reliable way would be server side scripting (PHP etc.) and RH doesn't support that. So make sure that your EULA contains some information on this possibility as well, such as a link in your topics stating that using the pages means that you accept the EULA. This may even be easier to implement, but I have no idea of the legal implications.
You can use jQuery for RoboHelp (I've used it quite a bit.) In my experience, RoboHelp doesn't reformat the code when it is in an external script file. I use a lot of script files and I have never seen this behaviour before (though that doesn't mean it doesn't of course).
Such a requirement is a lot of work and the best I can do on the forum is point you in the right direction.
If you require professional support, contact me via my site: http://www.wvanweelden.eu/ and we can talk about your options. Note that this is not associated with my forum contributions nor is it in any way affiliated with Adobe.
Greet,
Willam

Best way to implement app wide process

I am working on an application that has a list of art work in an sql report.. I want to be able to add each piece to a collection of items (which is stored in a table), so I added another column to the sql report to store the id of the art work. I am just wondering what is the best way to implement the process to insert the item to the collection of items. Since I want to do this from multiple pages - link from art work sql report; link from the edit page for a particular art work; and on the artists page where there is also an sql report, I thought it may be best to have an application process, to save duplicating the process on multiple pages.. however I don't think there's a way to pass the id of the item to the application process? as I was thinking best to have the application process conditional based on request, and then have the link as a doSubmit().
So is it best just to have the link redirect to the same page, passing the id of the item, and then having a process that runs before header that inserts the item, then assigning the item to NULL?
Thanks in advance,
Trent

Daniel:
Thanks for the info. I have found that the IFRAME works nicely for some applications,
however, some applications I want to re-write the front end to look better in
the portal rather than screen scrape.
Thanks for the help
Ryan
"Daniel Selman" <[email protected]> wrote:
Ryan,
Check out the thread (a few days old) titled "Different ways of creating
portlets".
Sincerely,
Daniel Selman
"Ryan Richards" <[email protected]> wrote in message
news:3d2eda12$[email protected]..
I have a few existing applications that I need to port over to portletsin
Weblogic
Portal 4.0. One application is a servlet based web application witha few
html front-end
screens. I am trying to determine how to do this in the best way. Ihave
noticed
that portlets behave differently inside the portal than do stand-aloneweb
apps.
Any help would be appreciated.
The other web application is the Microsoft Outlook Web Access. (Thisone
is going
to be difficult because it is actually an ASP app. I dont know if thisis
possible
without building some proxy code between bea and iis.)
Thanks
Ryan

Best way to implement FREE purchase?

Hi,
I have purchases that are free for logged in users. What's the best way to implement a no-payment solution? Would having the payment fields hidden and COD auto-selected if the amount field is 0.00 a good idea? Is there a better way anyone has implemented this? And how about security flaws?

Hi
Here is an article about "no cost" orders
COD payment method will not work for zero value orders , you will need to use the Free payment method described
in this article http://kb.worldsecuresystems.com/893/bc_893.html
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The best way to implement business logic to a .JSP ?

Hi experts,
I want to implement some business logic to a .JSP file wich is in my modified
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Can someone give me information how can I access this bean from my JSP (.par file) and how can I upload it to the portal?

Hi,
Here is the document about Calling J2EE Applications from Portal Applications:
http://help.sap.com/saphelp_nw70/helpdata/en/42/9ddf20bb211d72e10000000a1553f6/frameset.htm
So in your JSP do the lookup of your EJB.
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http://www.jguru.com/faq/view.jsp?EID=126400
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Greetings,
Praveen Gudapati

Best way to implement selectOneRadio component with "other" option

I have a selectOneRadio component that has an other option (see below). If the other option is selected I need to pull the value out of a text field. Any ideas on the best way (or any way) to
implement this?
This is how it looks on the screen...
Please select one...
o 10.00
o 20.00
o 30.00
o Other amount [    ] <--- Text box
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This is in 11g.
Any help would be appreciated.
Thanks,
Mike

Hi Mike,
I came up with the following codes as I assume you populate the selectOneRadio from a VO. The inputText will only be rendered if the "Others" option is selected. And you can get the actual ID of the selected items instead of their index.
/** Jspx **/
<af:panelFormLayout partialTriggers="rdbPrice">
<f:facet name="footer"/>
<af:selectOneRadio value="#{bindings.SampleVO1.inputValue}"
                     label="#{bindings.SampleVO1.label}"
                     required="#{bindings.SampleVO1.hints.mandatory}"
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    <f:selectItems value="#{bindings.SampleVO1.items}"/>
</af:selectOneRadio>
<af:panelLabelAndMessage label="Label 1"
                           rendered="#{bindings.priceId.inputValue == 98}">
    <af:inputText label="Label 1"
                  binding="#{backingbean.txtOthers}"
                  simple="true"/>
</af:panelLabelAndMessage>
</af:panelFormLayout>
/** PageDef **/
<bindings>
<list ...>
</list>
<attributeValues IterBinding="SampleVO1Iterator" id="priceId">
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      <Item Value="priceId"/>
    </AttrNames>
</attributeValues>
</bindings>
/** backing bean **/
public void yourMethod() {
    String priceId = getBeanValue("#{bindings.priceId.inputValue}").toString();
    System.out.println(priceId);
}Note:
1) It is assumed that the value 98 refers to the "Others" ID value.
2) The priceId attribute type in the SampleVO has to be changed to Long (my default was Number).
3) The getBeanValue() is the usual getValue call of a ValueBinding or ValueExpression.
http://brendenanstey.blogspot.com/2007/03/how-to-reduce-coding-by-extending.html
Regards,
Chan Kelwin

Theory - Best way to store this type of data for retrieval?

Hi everyone,
So I'm pretty new to databases and I'm trying to figure out an efficient way to retrieve this kind of data:
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col1 = {option1, option2, option3...}
col2 = {option1, option2, option3...}
coln = {option1, option2, option3...}
I need to be able to perform queries on the data based on some concatenation of 3 digit sequences for the ID
for example, I may want to retrieve all the records where the ID begins with '123' or where the ID begins with '123123', or '123123200', etc,
There are going to be close to a billion if not more of these records
the 3 digit sequences will always be a number between 000-255
It is not necessary for me to have a 36 digit long ID, I simply chose that because it seemed like the simplest way to associate a record with its combination of 3 digit sequences.
Like I said, I'm very new to databases. I've been doing a lot of reading on indexing and clustering and nested tables and partitions, but I'm not quite sure which of these I should pursue with this kind of data. Most of the examples that I've read about don't really deal about querying with variable precision.
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Thanks,
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Edited by: user9022475 on Jun 23, 2010 9:37 AM

So I'm starting to rewrite my code. I was shocked at how easy it was to implement the SAX parser, but it works great. Now I'm on to doing away with my nasty string arrays.
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<result1>
<element1>value</element1>
<element2>value</element2>
</result1>
<result2>
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Best way to implement m to n relation?

Could you please give me some advice on the best way to implement m-n relations in apex?
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create table SERVERS (id number primary key, name varchar2(30));
create table DATABASES(id number primary key, name varchar2(30))
and an m-to-n table
create table SERV_DB(serv_id number references SERVERS(id), db_id number references DATABASES(id), instance_name varchar2(30))
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How would you design an apex page to maintain this information (adding relations, updating instance names, etc)? I have a solution using checkboxes and 2 for-loops over htmldb_application.g_f40 (to process checkboxes) and g_f41 (to process text fields with instance names) and some delete statements but the logic behind it looks too complex for me. I am convinced that this can be done more simpler. Seems like a common problem to me, so I wonder if there is no out-of-the-box solution in apex for this?
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Geert

Thanks for your reply. You modified the question slightly, but conceptually it is still the same. What you call the instances table corresponds with my serv_db table. I understand the solution you propose using the tabular report. If I see it correctly, you would have an insert button above the tabular report for each new relation (instance - server) you would want to add. This is ok for the case i used (databases, servers, instances) because there are relatively few relations. However I would not like this solution for other cases. E.g.:
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Suppose you add a new person, and you want to assign 15 tasks to him. The solution above (with the tabular report) would be quite some work because you would have to click 15 times on the insert button and on each click select a task from the select list. In this case it would be more appropriate to, after selecting the new person, see a list of all tasks (e.g. 30 tasks) with a checkbox in front, so you can mark 15 out of the 30 checkboxes and press submit. It gets more complex when you want to assign also an attribute to the relation, i.e. showing the list with all tasks, a checkbox in front and a select list next to each task where you can choose from e.g. "priority high" or "priority low" to indicate that this task is high or low priority for that person. Is there an easy way to implement that?

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Hi,
my program needs to implement a basic function that most commercial programs use very widely: If the program requires that a GUI component (say a JTextField) needs to display multiple values it either goes <blank> or say something more meaningfull like "multiple values". What is the best way of implementing it?
In particular:
My data is a class called "Student" that among other things has a field for the student name, like: protected String name; and the usual accessor methods (getName, setName) for it.
Assuming that the above data (i.e. Student objects) is stored in a ListModel and the user can select multiple "Students", if a JTextField is required to display the user selection (blank for multiple selections, or the student "name" for a single selection), what is the best (OO) way of implementing it? Is there any design pattern (best practice) for this basic piece of functionality? A crude way is to have the JTextField check and compare all the time the user selections one by one, but I'm sure there must be a more OO/better approach.
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Ok, I will focus on building a solution on 12c.
right now I have used a USER_DATASTORE with a procedure to glue all the field together in one document.
This works fine for the search.
I have created a dummy table on which the index is created and also has an extra field which contains the key related to all the tables.
So, I have the following tables:
dummy_search
contracts
contract_ref
person_data
nac_data
and some other tables...
the current design is:
the index is on dummy_search.
When we update contracts table a trigger will update dummy_search.
same configuration for the other tables.
Now we see locking issues when having a lot of updates on these tables as the same time.
What is you advice for this situation?
Thanks,
Edward

Best way to implement application level persistant objects?

I'm designing a J2EE application and want to create some objects that represent lookup tables in the database. I would like these to be static objects that get created either at application startup or the first time they are called and remain in application scope globally for all users/sessions. These are objects that contain lists used for drop-downs/listboxes. I don't necessarilly want to take up unecessary memory
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Thanks.

You can simply (and properly) implement the Singleton pattern. Then multiple threads can all query the cached reference table values in the Singleton. Now, I know, that Singletons and J2EE are supposedly no-no's, but sometimes the easiest and simplest solution really is the best one. Perform the database query at startup in a static initializer. Then ensure that you do not have mutator methods (e.g., removeXXX(), setXXX(), addXXX(), etc.) Only provide accessor/getter methods. If you want to be able to refresh the cache without restarting the server, you will have to think about race conditions. But if you are implementing a vanilla cache, I would go with a Singleton.
- Saish
"My karma ran over your dogma." - Anon

What's the best way for reading this binary file?

I've written a program that acquires data from a DAQmx card and writes it on a binary file (attached file and picture). The data that I'm acquiring comes from 8 channels, at 2.5MS/s for, at least, 5 seconds. What's the best way of reading this binary file, knowing that:
-I'll need it also on graphics (only after acquiring)
-I also need to see these values and use them later in Matlab.
I've tried the "Array to Spreadsheet String", but LabView goes out of memory (even if I don't use all of the 8 channels, but only 1).
LabView 8.6
Solved!
Go to Solution.
Attachments:
AcquireWrite02.vi ‏15 KB
myvi.jpg ‏55 KB

But my real problem, at least now, is how can I divide the information to get not only one graphic but eight?
I can read the file, but I get this (with only two channels):
So what I tried was, using a for loop, saving 250 elements in different arrays and then writing it to the .txt file. But it doesn't come right... I used 250 because that's what I got from the graphic: at each 250 points it plots the other channel.
Am I missing something here? How should I treat the information coming from the binary file, if not the way I'm doing?
(attached are the .vi files I'm using to save in the .txt format)
(EDITED. I just saw that I was dividing my graph's data in 4 just before plotting it... so It isn't 250 but 1000 elements for each channel... Still, the problem has not been solved)
Message Edited by Danigno on 11-17-2008 08:47 AM
Attachments:
mygraph.jpg ‏280 KB
Read Binary File and Save as txt - 2 channels - with SetFilePosition.vi ‏14 KB
Read Binary File and Save as txt - with SetFilePosition_b_save2files_with_array.vi ‏14 KB

Best way to implement this code in labview

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