AS-i Bus Interface
ASi Bus Interface
is a low-cost electromechanical connection system designed to operate over a two-wire cable carrying data and power over a distance of up to 100m. Longer distances can be accommodated if repeaters are used. It is especially suitable for lower levels of plant automation where simple - often binary - field devices such as switches need to interoperate in a stand-alone local area automation network controlled by PLC or PC. AS-Interface is a digital replacement for traditional cable architectures.

It is most often used for proximity sensors, limit switches, valves and indicators in applications like packaging machines and material handling systems. ASI Bus Interface is designed for small systems employing discrete I/O. It allows for up to 31 slaves, which can provide for up to four inputs and four outputs each for a total of 248 I/O.

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Figure: AS-Interface Principle
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ASI Bus Interface Overview

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ASi Bus Interface
Actuator Sensor Interface. Used to network sensors and actuators. ASi is a two wire interface; Power and Data. Based around ProfiSafe [developed from Profibus DP].ASI bus was developed by Siemens Automation. This is a Unshielded 2-wire [Yellow cable], Unterminated, Ungrounded Sensor Bus. The Topology may be either Bus, Ring, Tree, or Star at up to 100 meters. Power is provided by a 24V floating DC supply, which can supply at least 8 A over the network. The AS-Interface is an open standard based on IEC 62026-2 and EN 50295. The AS Interface may also be termed the 'AS-Interface', 'ASI Bus', or 'ASi-Bus'.
Industrial Automation
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