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====== lamaPLC Communication: AS-i ======
{{ :com:asi_logo.png?120|lamaPLC Communication: AS-i}}
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Actuator Sensor Interface (AS-Interface or ASi) is an industrial networking solution (physical layer, data access method and protocol) used in PLC, DCS and PC-based automation systems. It is designed for connecting simple field I/O devices (e.g. binary ON/OFF devices such as actuators, sensors, rotary encoders, analog inputs and outputs, push buttons, and valve position sensors) in discrete manufacturing and process applications using a single two-conductor cable.\\
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{{ :com:as_i_1.png?150|AS-i}}
AS-Interface is an 'open' technology supported by a multitude of automation equipment vendors. The AS-Interface has been an international standard according to IEC 62026-2 since 1999.\\
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AS-Interface is a networking alternative to the hard wiring of field devices. It can be used as a partner network for higher level fieldbus networks such as Profibus, DeviceNet, Interbus and Industrial Ethernet, for whom it offers a low-cost remote I/O solution. It is used in automation applications, including conveyor control, packaging machines, process control valves, bottling plants, electrical distribution systems, airport baggage carousels, elevators, bottling lines and food production lines. \\
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AS-Interface provides a basis for Functional Safety in machinery safety/emergency stop applications. Safety devices communicating over AS-Interface follow all the normal AS-Interface data rules. The AS-Interface specification is managed by AS-International, a member funded non-profit organization located in Gelnhausen/Germany. Several international subsidiaries exist around the world.\\
===== AS-i versions =====

^feature^Version 2.0^Version 2.1^Version 3.0|
^**number of slaves**|max. 31|max. 62||
^**I/O number**|124 I / 124 O|248 I / 186 O|496 I / 496 O|
^**signals**|Data and power supply up to a maximum of 8A (value dependent on power supply unit).|||
^maximum current consumption|65 mA / participant|||
^**wire**|unshielded, untwisted, special 2 x 1.2 mm² wire (more under [[#wires|wires]])|||
^request time per slave|150µs|||
^**maximum cycle time**|5 ms\\ |10 ms (with extended addressing, otherwise 5 ms)||
^**analog value transfer**|through a function block|operation integrated into the master||
^**number of analog values**|16 bytes of digital and analog values|124 analog values||
^data transfer rate|167 kBit / s, net 53.3 kBit/s (with pauses)|||
^topology|optional, typically ring, tree, chain or bus.|||
^**type of connection**|master / slave (monomaster)|||
^**wire length**|100 m per segment, can be extended to a maximum of 300 meters with a maximum of 2 repeater (there can still only be one master in the entire network).||100 m per segment, maximum 600 m. |
^addressing|with addressing unit or automatic|||
^coding||Manchester-II / APM|||

{{ :com:as_i_siemens.png |AS-i Siemens}}

{{tag>bus communication as-i basic}}
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