default values in subvi

[weitong]

HI,

  Every time when main VI calls subvi, those values/setting in subVI which are not connected with mainVI will go back to default values.

  How can I let subvi remember those values (which is changed in the last time call) as the setting in the next time call?

Wei

LV7.1 

[TCPlomp]

Here's an idea:

 

The style used is sometimes referred to as 'Functional Global'.

Ton

Message Edited by TonP on 12-18-2008 07:15 PM

[weitong]

Maybe I didn't describe my question clearly.

Here is the example (See attachment).

Every time, when I run main.vi, It automaticaly use y=0 (default value) as the y input in Sub.vi.

But, if I run Sub.vi itself only, every time the y use the last time result as this time input. I want to realize this when I use Main.vi  to call VI.

Do I have to read the y values in sub.vi to main VI, and then input to SubVI next time when Main.vi call it?

[TCPlomp]

I understoord your question perfectly, you didnt understood the answer

Here's a new example, where I check both inputs (Numeric and Y) in the subVI:

 

Ton

Message Edited by TonP on 12-18-2008 07:47 PM

[gosenbach]

This may be a bit more than you were looking for but this is one way of doing it.  I added some stuff you your subvi to turn it into a simple action engine.  use the enum control in main to control how it works.  The first time you run it, select "init".  From then on you can either select "retain" and it well store the last y value.  "Use Y" will use whater is wirest into the Y input, and "init" at any time will reset it back to 0.

[Anil_Reddy]

Hi,

did u try global variable?

store Y in a global in Sub VI......read that when u run Sub VI from main VI........

Anil

[weitong]

See attachment. There are 2 pair of Main-Sub vi.

They are exatctly same code. Only difference is that they are written in different computer.

Please run to see the difference. Why are they different?

[gosenbach · Accepted solution]

Well, in the first one, you do not that the "y" control linked to a terminal on the connector pane.  The one that does not remember, you do.  So when the subVI runs in the code that has the y value linked up, it uses the default value.

[weitong]

OK, I see. This is what I want to know.

Thanks to everybody answering my question.

Best,

Wei,

Message Edited by weitong on 12-18-2008 02:00 PM

[gosenbach]

Althought this does not give you any way to reset y other than unloading the vi from memory...