6ES7193-6BP40-0BA1 is a dark baseunit. It takes 24V from the previous module.
6ES7193-6BP40-0DA1 is a light-grey baseunit. It interrupts the 24V from the previous module, and has terminals for connecting the 24V.
So when you need to isolate the 24V into groups, you add a light-grey base unit and places the dark base units that are to be supplied with the same 24V after that.