If a system has multiple CS650-L or CS655-L sensors, it will be necessary to connect many wires to a 12 V supply and many wires to ground. The DIN-Rail Mounting Kit is useful for attaching many wires to the same source in a clean and organized way. For more details, see the 5458 DIN-Rail Terminal Kit instruction manual.
Other methods of connecting several wires together, such as terminal strips or wire nuts, would also work.