Some problem about setup

Hi, guys,I encounter a problem.
I created ten controllers, added a boolean attribute “facial” to evryone. I want to setup like,when one controllers “facial” attribute is set to “on”, the other controllers “facial” attribute is set to “off”, Only one controller`s “facial” attribute is set to “on”.
I test scriptNode, it is executed when a file is loaded or when the script node is deleted.
My English is not good ,thanks in advance.