cutoff switch

[nbfanc]

I am using Labview to, among other things, control a motor speed. All this involves is sending a voltage from a D/A convertor to the motor speed control. However for safety I would like to have an emergency cutoff button. Thus would just be a button on the screen that if pushed would immediately drop the D/A voltage to zero.

How do I do this?

[TomAD]

What HW platform are you using?

You can insert a paralell while loop that reads the emergency shutdown button. If pressed this will update a local variable, who is read in your original loop.

Wire the variable to a selector, where true outputs a value of 0, and false outputs the controlled value.

-Tom