Hi Marmelo
The default state of a boolean control is "Faslse". If you want that "True" is the default state you have to change the value to true and than right click on the control, select Data operations and there select "make current value default". After that the default value of the boolean control is "True". Under Mechanical Action you can define different switch actions.
Luca P.
Applications Engineer
National Instruments
Regards,
Luca