Ales
It is possible to protect an input field with a password. In the properties of the input field, click on the enable tag, here you can set your password level from 0 to 9. Password level 0 is no password required. Password level 9 is the 'supervisor' level.
I have only done this with TP 27-10 screens, so that is what I am baseing my answer on.
The only password set in protool is the 'supervisor' one. The default for this is 100. To change the supervisor password click on 'SYSTEM' and from the drop-down menu select 'SETTINGS'.
The other password levels (1 - 8) are user defined on the screen itself, but these are lost and have to be redefined everytime you download a new or updated program to the screen.
Hope this helps
Paul