Phoenix Contact Axioline Smart Elements Safety Modules are an extension of the Axioline F I/O system and provide a compact modular I/O option. These devices offer a variety of digital, analog, and function modules that can easily be installed into 4- or 6-slot base units for the AXL F backplane. The Phoenix Contact Axioline Smart Elements series features two pieces: the base units and the Smart Elements. The base units contain a single power connector and distribute this power to all connected Smart Elements modules, reducing installation time.