Update Indicator from SubVi in Main Vi

Hi, I am new to labview and have recently undertood the concept of Control Refnum. Because all the examples online are related to passing controls to the subvi and triggerign an event there, I am able to do it and it works. I am here because I could not find any example where indicator values are passed back to the Main Vi. I have attached my two Vis and will appreciate if someone could help me understand and apply this concept.
I am just pressing a button in Main Vi and want the LED and number indicator in my main vi to update from the sub Vi. Currently it only updates in Sub Vi.
Thanks
Attachments:
Actual.vi ‏8 KB
A_TRAILER.vi ‏18 KB

lsbu wrote:
I will have nearly 8-10 events in my final program and I find it easier to shift them to sub vi.
That's very few events. Did you not know the event structure can handle many events? At that point, it is as hard to manage as a single case structure (which is dirt easy). Trust me. It will be a lot easier to manage a single event structure than trying to follow your references everywhere just to try to figure out who is handling what event.
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How to add indicators from subVIs to main VI

Hi,
I have a similar problem as well as a question or two about running subVI's. Basically, I am trying to create a project that will use both syringe pump injections and the opening and closing of valves to transport a fluid. As of now, I have a program written for the syringe pump that I was able to modify from an instrument driver from the manufactuer of the syringe. The goal is to just have the operator press a single run button, as all volume and flow rate conditions will stay the same from trial to trial. I created two separate syringe pump suvbVI's, one injects 1mL of fluid at 1mL/min and the second injects 2mL of fluid at 1mL/min.
I want to use the flat sequence structure to run these two subVI's sequentially, which I am having some difficulty with. I set this up so that the operator must press an "OK" button in order for the case structre to read "true" and begin the operations in the flat sequence. Both subVI's work correctly if operated on their own. However, when I use the highlight data flow function (lightbulb on block diagram) I can see that pressing the OK button causes the case structure to read true, and the program to engage the first subVI. Upon opening the block diagram of the first subVI and using the same lightbulb tool, I noticed that the information is getting stuck in the first while loop and repeating itself endlessly. Any suggestions as to why this may be the case? (I did go into each subVI and changed the VISA resource name to the correct COM port)
Also, once I figure out how to get the information to flow correctly, I do want my main VI front panel to display some of the front panel indicators on the syringe pump VI's, such as the volume dispense and tank. I would like to know more information about how to reference a wire to the subVI as previously mentioned in this thread.
Sorry this was such a long post! I attached the main VI with the embedded syringe pump subVI's as well as both individual subVI's. Any suggestions would be greatly appreciated!
Thanks
Attachments:
Test Project_Pumps.vi ‏9 KB
NE-50X Push Button Example-tester_1mL_3_30_1013.vi ‏289 KB
NE-50X Push Button Example-tester_2mL_3_30_1016.vi ‏289 KB

galXE1,
From my example you can use the invoke node method of "get all" and it will retrieve all the indicator names and values and then you can get the values you want.
Sorry for not posting this originally but without modifying your code a bunch your quickest option is to use shared variables. If you have important vital tasks they aren't the best but if you're just looking to pass data between vi's then they are you're easiest option.
Creating a Shared Variable - look at single process shared variable section.
http://zone.ni.com/devzone/cda/tut/p/id/4679
So you basically call your subvi every time the loop iterates to perform some execution and then you can update your main front panel with the newest values. Calling the subvi with a loop in it. Nothing special but it gets the job done. Its not very good practice if you have a bunch of values you want to pass.
See subvi calculations.jpg
A better approach to passing data between vi's is detailed in the document. Its called a Functional Global Variable.
https://decibel.ni.com/content/docs/DOC-12876
Kyle Hartley
RIO Product Support Engineer
National Instruments
Attachments:
Subvi calculations.JPG ‏42 KB

Show indicator from subvi

Hello
I am very new in programming with labview. I have a problem showing property of a boolean indicator of a Subvi in a mainvi. The Subvi contains a while loop where the property of the indicater is set.
I have attached the two files in Labview-version 8.0.
The problem is that the property of the indicator of the main vi only changes at the seconed time. The reason for the problem is clear. The property of the indicator is set only once in the beginning and not continuous. Can somebody complete the attached vi´s with the necessary functions so that I can comprehend it. May be I can solve the problem with a global variable or a reference. I tryed a lot but my skills in programming are not so gut.
Thank you for your help
Attachments:
Mainvi Indicator.vi ‏11 KB
Subvi Indicator.vi ‏17 KB

Thank you all for your replies
@davidpcl : The VI´s you gave to me could help me a lot. But by using these vi´s one other problem was generated.
I want to open thes SubVi several times by the MainVi. The problem ist the correct parameterization of especially the stop-button. With the parameterization you gave me I could not use it several times in the MainVi.
Can somebody give me a help?
I attached the two new fiels.
Attachments:
MainVI addon.vi ‏17 KB
SubVI addon.vi ‏23 KB

Text output using string indicator from subVI to mainVI

Hi,
I think I asked similar question before, but since then my program got more complicated.
Here is my issue.
I have a program with nested loops to print out the stream of strings in subVI
and it needs to be updated in a string indicator in mainVI.
When I say "update", it needs to be updated as it comes out line by line, not by
the block when the loop is finished.
I was not successful doing this by both shift register or RefNum.
Maybe I do not know the advance usage these two.
So can someone show me how?
I have attached simplified version of my labview program.
Thank you in advance!!!
Solved!
Go to Solution.
Attachments:
MainSubStrIndicator.zip ‏12 KB

Hi horanyee,
use some standard shift registers to achieve your goal... They will keep the previous valu so you can ad the new line!
Message Edited by GerdW on 09-11-2009 08:43 PM
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome
Attachments:
subVI.vi ‏8 KB

Main VI is not updating the data from subVI

Dear all,
I
have a Vi A using the data front a subVi B. When I run it, I see the
data is updating in the subVI, but not the main Vi and the Front Panel.
The subVi has three output channels and the main Vi tries to display
those three channel data on the Front Panel.
Could somebody tell me how I can solve the problem?
Thanks a lot.
Roy
Solved!
Go to Solution.

You could probably use Control Refnums but as Dennis mentioned, be sure to explain the use case to us.
How Can I Update the Changes Made to a Control/Indicator from a SubVI on the main VI?
Message Edited by Adnan Z on 06-02-2009 02:48 PM
Adnan Zafar
Certified LabVIEW Architect
Coleman Technologies

How to get updated values from the loops while they are running

Hello,
I am having difficulty solving a very basic problem, how to access the updated values from the 'FOR loop' while its running? Basically, the VI I am currently working on calls two sub VIs. Each sub VI has a for loop, and both VIs may or may not run for same number of iterations. My goal is to read the values at each terminal inside the loop of both sub VIs, in the Main VI. I tried to achieve it using Global Variables, but in main VI it displays only the last iteration value from both sub VIs. Could anyone please tell me whrere am I going wrong? Is there any other/better way to achieve this.
I appreciate any input on this issue.
Kudos are (always) welcome for the good post. :-)
Solved!
Go to Solution.

Dennis,
In attached VI, I can see the values changing in the sub VI from the main VI with the numeric indicator whose reference is passed on to the sub VI. Now if I wanted to store or use those values how do I do that? I tried to chnge the indicator to control and read from it (in the attached VI) , but the the indicator updates only once. Tried to create a property node and read the Value from it and it didn't work either.
Thanks in Advance!
-Nilesh
Kudos are (always) welcome for the good post. :-)
Attachments:
main-1.vi ‏8 KB
sub-1.vi ‏9 KB

Write multicolumn listbox value from subvi whitout reference

Hi:
Is it anyway to write data to multicolumn list box from subVI without pass in reference? Because if pass in reference I have to pass a lot.
Like I can use Open VI Reference together with "Set Control Value" to set a String indicator text. But I can't find the way to use open vi reference to set the multicolumn listbox text, I only can highlist which row.
Thank.

One thing you could do:
Write the multicolumn listbox reference to an indicator in your main VI. In the SubVI read that indicator value and unflatten it into a multicolumn listbox reference. Then you'll have the reference available in the SubVI as if you had passed it.

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"Old" update rule from ODS not working

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REgarding Info update indicator in PO

Hello Gurus,
There is no EVO parameter set in user profile.But still while creating PO ,system still taking Infoupdate indicator in PO.
Please let me know whr this tick is coming from?
Thanks
santosh

Hi
Regarding EVO Check sap note;-202173,it may helpful to you
this is from sap notes
The system does not use the default value for the InfoUpdate indicator in the purchase order of the EVO parameter. Customizing in transaction OMFI
Consider the following two scenarios:
There is an info record in the system.
The system looks in table T160V (that is, Customizing in transaction OMFI with user parameter EVO).
1. There is an entry with InfoUpdate indicator 'A':
If an info record exists at plant level, the system overwrites this with the value 'B'.
If no info record exists at plant level, the system proposes the value ' C' by default.
2. There is an entry with a 'blank' InfoUpdate indicator or with the value 'B' or 'C':
The system always transfers Customizing from OMFI.
3. There is no entry (' ... ') and no user parameter is assigned:
The system sets the InfoUpdate indicator with the same logic as for the InfoUpdate indicator 'A'.
There is no info record in your system:
The default value for the info update indicator is determined by Customizing.
1. There is no entry (' ... ') and no user parameter is assigned:
The system sets the InfoUpdate indicator to 'A'.
General logic (independent of the info record):
1. There is a 'blank' entry and no user parameter is assigned:
The settings that are stored for the 'blank' entry are used.
You can choose to make 'blank' the default setting of the InfoUpdate indicator for all users. You can do this by maintaining the InfoUpdate indicator entry as 'blank' for the 'blank' entry in Customizing.
2. The InfoUpdate indicator is 'blank', 'A' ' B ' or 'C' and the condition maintenance for the plant is activated:
If only plant-specific conditions are allowed, the system overwrites the value with 'B'.
If no plant-specific conditions are allowed, the system overwrites the value with 'C'.
Regards
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Info Update Indicator Tick in 'Material' Tab page of Purchase Order.

Dear All,
I am creating a Purchase Order and in 'Material' Tab Page of PO , Indicator "INFO UPDATE" is having Tick.
Is it possible to do customization so that Tick will not appear as a Default Value?
You are requested to kindly provide valuable solution to this.
Thanks & regards,
Vishwas

Hi,
If you dont maintain Purchase Info Record for a Particular Material, System will automatically create one Purchase Info Record in Background with Vendor and Price Detail only.
For this,in OMFI the Purchase order Update Indicator should be B and in Po item Detail tab Info Update Indicator will be Checked. If you want you can change the PIR which was created in background.
The Configuration settings for Autoupdate Inforecord is in OMFI trxn code.
Go to OMFI and in Info record update tab keep Blank value agianst purchase order and save.
From next time when you create Po you can see the item detail tab for Inforecord update is unchecked.
Define default values for buyers
Transaction OMFI
Double click on the default values you want to change.
Save it.
Next, you've got to associate via SU01
Click Parameters, insert a new parameter id EVO to the authorization code.
Type in Parameters value you want e.g. 01
You have to assign the control for ALL the SAP buyers via thier SAP users id.
Logoff and login again. Then try to create a Purchase Order and check the default values.
In the Fast Processing button :-
you can choose whether to adopt automatically all the line items fields in the Purchaes Requisitions.
Regards,

Calling producer/consumer subvi using main vi for image grab acquire

Hi everyone,
I am not sure if I get the producer/consumer concept wrong. I tried to write a producer/consumer subvi that simulate continuously grab acquire image. When I call the subvi from the main while loop with a main vi, it seems to run into a infinite loop. I am wondering does anyone know how else can I activate a producer/consumer subvi using main vi? Thanks in advance.
Kind regards,
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Solved!
Go to Solution.
Attachments:
MainTrial.vi ‏7 KB
ProducerConsumerGrab.vi ‏18 KB

Hi Han Yen,
a few remarks :
- your Top VI has no function what so ever. So skip that.
- your image queue has no name, so that gives problems from the minute you're going to use more queues.
- It does not matter which command you send to the queue, it will start the bottom loop anyway
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Have fun using LabVIEW... and if you like my answer, please pay me back in Kudo's
LabVIEW 5.1 - LabVIEW 2012
Attachments:
ProducerConsumerGrab.vi ‏21 KB

Update Indicator from SubVi in Main Vi

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