AS-Interface
From Wikipedia, the free encyclopedia
AS-Interface (AS-i) is the simplest of the industrial networking protocols used in PLC, DCS and PC-based automation systems. It is designed for connecting binary (ON/OFF) devices such as actuators and sensors in discrete manufacturing and process applications using a single cable. It is an 'open' technology supported by leading automation vendors. Well over 10 Million AS-i field devices are installed and proven globally.
AS-Interface is a highly efficient networking alternative to the hard wiring of field devices. It is an excellent partner for fieldbus networks such as *Profibus, *DeviceNet, Interbus and *Industrial Ethernet, for whom it offers a low-cost remote I/O solution. It is proven in hundreds of thousands of applications, including conveyors, process control valves, bottling plants, electrical distribution systems, airport carousels, elevators, bottling lines and food production lines.
AS-i provides the ideal basis for Functional Safety in machinery safety/emergency stop applications. A special profile called Safety as Work (sometimes called ASi-Safe) is used. Safety devices are connected on the same cable as the control system and can provide Safety support up to SIL (Safety Integrity Level) 3 according to IEC 61508.
