control event structure with command

[FredFred]

Hello to all...

Is there a way that I can trigger an event within an event structure with the use of a command?

Thanx N Advance!

FredTest

[RavensFan]

What do you mean by "command"?  A button press?  A word typed in a string control?  Something else?

[Pnt]

Take a look at user events - Labview examples.

Also

http://forums.ni.com/ni/board/message?board.id=170&message.id=231188&query.id=10218#M231188

http://forums.ni.com/ni/board/message?board.id=170&message.id=144746&query.id=10249#M144746

[_S_G]

There are 3 ways to trigger an event:

1.  A UI triggered event, when the user does something on the front panel (such as click, move mouse, etc.)

2.  A dynamic event, which is generated programmatically.  You need to register events before you can do this.

3.  If your code writes something to the Value (signalling) property of a control/indicator, the event structure behaves as though case 1. occurred.

[FredFred]

SG (Thanks for the reply)

3.  If your code writes something to the Value (signalling) property of a control/indicator, the event structure behaves as though case 1. occurred.

I have already tried doing #3  as you have mentioned and there is no way that the program will jump into that event. It sets the values but doesn't trigger the event to turn on the LEDS. See attached vi.

ThanksNAdvance

FredTest

[FredFred]

I answered my own question...due to the fact that there was no timeout value tied to the event structure the next event couldn't start. Thank you all for your help.

[Ray.R]

Yes, it's important to consider that timeout node.  🙂

[johnsold]

FredFred,

Event structures are almost always used inside a while loop. If no event occurs, the loop does not iterate. The timeout case is not required and can be omitted if you do not need it.

The other issue is dataflow. The controls will most likely be read before the event structure is called and the VI will not do anything until one of the event cases executes. Both cases work, but one one per execution of the VI.

Look at the help for the event structure.

Lynn