AS-Interface (short for Actuator/Sensor Interface) is an internationally recognized standard for field bus communication. With over 32 million nodes installed world-wide, it is heavily used at the sensor/actuator level of automation systems.
This simple wiring system consists of four components: the ASi Master, an ASi power supply, the yellow ASi cable, and the ASi slaves. Using piercing technology, sensors and actuators are connected directly to the ASi cable. The unshielded two-conductor cable carries both power and communication, including safety signals. As a result, AS-Interface eliminates cumbersome parallel wiring. The ASi Master controls the data communication on the network. As a Gateway it creates the connection between the ASi network and the controller (e.g. PLC). The upper-level fieldbus treats it like a fieldbus slave. Integrating an ASi network into an existing fieldbus or Ethernet system is no more complicated than adding any other I/O module.
Digital Modules with two times two flat cable connections (Click to enlarge)