How to maintain the Boolean LED ON after press the OK button (Latch when released)

[Yumi]

Hi experts,

I am new to labview and I am wondering how to maintain a Boolean LED ON after press the OK button (Latch when released). As the system I designed is to press a OK button (Latch when released) to strat the temp recording, and i would like to have the LED indicator on all the time during the process untill I press the stop button to stop the process. Thanks~!

[OA1]

Hi Yumi,

Is this what you're trying to do?

[GerdW]

Hi Yumi,

press a OK button (Latch when released) to strat the temp recording, and i would like to have the LED indicator on all the time during the process untill I press the stop button

This whole sentence boils down to:

led := (led OR start) AND NOT(stop)

(You might want to initialize the shift register.)

[Yumi]

Thank you guys! Do I need to create a sub-vi according to yours and place it in my existing problem which already has a while loop? I am not sure if the same vi can take two while loop at the same time.

[Yumi]

sorry for the typo, it is "program"

[crossrulz]

No, it does not need to be in another While loop.  Just add the shift register to the current loop you have.

[altenbach · Accepted solution]

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@crossrulz wrote:

 Just add the shift register to the current loop you have.

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... or use a feedback node instead. Shorter wires... 😄

[Ben]

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@altenbach wrote:

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@crossrulz wrote:

 Just add the shift register to the current loop you have.

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... or use a feedback node instead. Shorter wires... 😄

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Spoiler

and runs faster... less distance to travel

Ben

[altenbach]

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@Ben wrote:

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@altenbach wrote:

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@crossrulz wrote:

 Just add the shift register to the current loop you have.

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... or use a feedback node instead. Shorter wires... 😄

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Spoiler

and runs faster... less distance to travel

Ben

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Spoiler

Yes, but it has to slow down for the tighter bends.

[Bob_Schor]

The whole point of having multiple Mechanical Actions for Boolean Controls is to allow you to choose whether the Control "stays on" when pushed, "stays on" only while pushed, or appears to always "stay off", ready to push.

If you want the Control to go on and stay on when pushed, that's the Mechanical Action "Switch when Pressed" (right-click the OK Button and choose the first Mechanical Action).  If you want it on only while pressed (like a "Door Bell Push Button"), select "Switch until Released" (the third Action).  If you want an "always off, ready to push" button, leave it as "Latch when Released" (Action 5) and be sure to read it when it switches (it is the reading of the "True" state of the button that sends it back to the default, False, state).

The Mechanical Actions are there for you to use (without needing "code").  Choose the Action that suits your need.

Bob Schor