The AS-i bus system consists of four components: the AS-i master, an AS-i power supply, the yellow AS-i cable, and the AS-i slaves.
The sensors and actuators are connected directly to the AS-i cable using the piercing technology. This is a two-conductor, unshielded cable which carries power as well as the functional and safety signals. No cumbersome parallel wiring is necessary.
The AS-Interface standard was expanded in 2012, so that in addition to the cable with a conductor cross-section of 1.5mm2 there is also one with increased rated current capacity (2.5mm2 cross-section).
The AS-i master organizes data communication in the network and as a gateway establishes the connection between the AS-i network and the higher level controller. It is treated by the higher level fieldbus as a fieldbus slave. Incorporating an AS-i network into an existing fieldbus or ethernet system is thus no more complicated than integrating any other I/O module.