Solenoid subVI

[Elling87]

Hi!

Im working with making a subVI to set a the outputs to a valve. I have been trying for a while now, but just dont seem to get it right.

This is the function that im looking for:

One output opens the valve, and output closes it. These two can not be active at the same time. 

To open the valve, i need the output to be set hi for at least 5 sec, and after that it goes low again. The valve vil now hold its posittion. 

The same ways goes with the closing. 

The output status changes with a hi pulse.

Can anyone help me with this? Anyone that got a smart solution?:)

[danil33]

Hi Elling,

            Do this first, in your subVI.File>>VI properties>>In category>>Execution>>Enable re-entrant execution.

            Then try to do properly what you want.

[GerdW]

Hi danil,

could you please explain how reentrancy could solve any of the problems involved in the OPs question?

Infact I think it's not a good idea to set this subVI reentrant.

---

This is the function that im looking for:

One output opens the valve, and output closes it. These two can not be active at the same time. 

To open the valve, i need the output to be set hi for at least 5 sec, and after that it goes low again. The valve vil now hold its posittion. 

The same ways goes with the closing. 

The output status changes with a hi pulse.

---

I would use a statemachine approach for that purpose. The subVI will remember the current status of the valve and can handle any timing inssues on it's own. Define some states (like: init, switch, wait) to handle the different tasks. Then it will become easy to implement the logic...

[MoReese]

What hardware are you using?  Can you post the section of code in question?  This would be helpful.

[Elling87]

Hi and thanks for the replys:)

Im using a Ni PXI-1036 Chassis, with a PXI-6238 card.

Im also using the PXI-8360 link card to connect to the laptop.

[MoReese]

And your code?

[Elling87]

Im not quite shure what code you want 

Im kind of new in this program.

I have tryed setting it up as a event(Attached file) but i than figured out that i couldn't jump out of the event if the valve needed to be closed soner than after the event.

I have been sitting a few hours today(without getting far), trying with a state machine. But im just no getting it right.

[MoReese]

An event structure may not be the right archetecture for you.  I think a state-machine will work best.  Can you down-convert your state-machine?  Go to File>>Save for Previous Version, and save it for 8.2.

[Elling87]

Here you go!

[Elling87]

I think i might figured it out now!

Check out the attached file:)

Is there any improvements that should be done?