Guys,

I went back to the job which has the 411M HS and yes, the group power supply fed directly to the lead controller, so I think I agree with the response for providing common power for the group fixtures in the halls. I think I understand it a little better at this point, turns out some controllers can have a DC supply with blocking diodes so that all controllers are able to provide a source of power for the group control boards. In that sense, as long as one controller is online, it can power the group control board and hall fixtures. Seems like each manufacturer handles this a bit differently.

Thanks for the responses/feedback.