As default each target is set to Auto, this means that the target can be a master or slave. If a target when powered finds another target it will automatically become a slave, otherwise it will become a master.
There is circumstances where this feature is useful.
If you want to force a target to always be the master. You must set all other targets to slave.
For a range of targets powered by nodes via the mains, there is no time for one target to check whether its the master as all the targets power simultaneously .
For more information on hard powered targets, please see “Wired Power Operation”