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Originally Posted by evilhunter
alright so the pnuematic will go back to a close state when the robot is disabled or when someone stop touching the button
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Yes,
but...
...this assumes that the pneumatic device is in a "close state" when the Festo is off, and that there is code running which turns the Festo on only while the button is touched. It's easy to change the way the hoses connect so that the pneumatic cylinder runs in the opposite direction and only goes to the "close state" when specifically commanded, and it's easy to change the code so that the signal to the Festo valve does something other than simply reflect the state of the button.