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lamaPLC Communication: AS-i

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-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.

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

featureVersion 2.0Version 2.1Version 3.0
number of slavesmax. 31max. 62
I/O number124 I / 124 O248 I / 186 O496 I / 496 O
signalsData and power supply up to a maximum of 8A (value dependent on power supply unit).
maximum current consumption65 mA / participant
wireunshielded, untwisted, special 2 x 1.2 mm² wire (more under wires)
request time per slave150µs
maximum cycle time5 ms
10 ms (with extended addressing, otherwise 5 ms)
analog value transferthrough a function blockoperation integrated into the master
number of analog values16 bytes of digital and analog values124 analog values
data transfer rate167 kBit / s, net 53.3 kBit/s (with pauses)
topologyoptional, typically ring, tree, chain or bus.
type of connectionmaster / slave (monomaster)
wire length100 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.
addressingwith addressing unit or automatic
codingManchester-II / APM

AS-i Siemens


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