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lamaPLC Communication: AS-i
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.
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.
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.
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) | |||
| 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 | |||
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