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Siemens AS- Interface (AS-I)

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To implement the communication, the following system installation components are available:

  • AS‑i Master modules for central control units such as SIMATIC S7, ET 200M/ET 200SP distributed I/O, or routers from PROFIBUS or PROFINET to AS‑Interface
  • AS‑i power supply unit or alternatively standard power supply unit in combination with an AS‑i data decoupling module for the power supply to the slaves and sensors
  • AS-Interface shaped cables
  • Network components such as repeaters and extension plugs (cannot be used for AS-i Power24V)
  • I/O modules (AS‑i slaves) for connection of standard sensors/actuators
  • Actuators and sensors with integrated AS-i slave
  • Safe I/O modules (ASIsafe slaves) for transmitting safety-related data through AS‑Interface
  • Addressing units for setting the slave addresses during commissioning

Example of a configuration with the system components:

Standard
IEC/EN 62026‑2
Topology
Line, star or tree structure (same as electrical wiring)
Transmission medium
Unshielded twisted pair (2 x 1.5 mm2) for data and auxiliary power
Maximum cable length
100 m without repeater

200 m with extension plug

300 m with two repeaters in series connection

600 m with extension plugs and two repeaters connected in parallel

Larger cable lengths are also possible when additional repeaters are connected in parallel

Maximum cycle time
5 ms in full expansion with 31 standard addresses

10 ms in full expansion with 62 A/B addresses

Profile-specific for slaves with extended data, e.g. analog slaves

Number of stations per AS-Interface line
Up to 62 slaves (A/B addressing) integrated analog value transmission
Number of binary sensors and actuators
max. 496 DI / 496 DQ
Access control
Cyclic polling master/slave procedure

Cyclic data copying from host (PLC, PC)

Error safeguard
Identification and repetition of faulty message frames

We are Siemens trusted and approved distribution partner.

As a Value Added Reseller in Siemens’ Approved Partner network, Parmley Graham is a proven supplier of a wide range of quality products in the UK and globally. 

Find out more how this will benefit you or check Siemens Configurator.

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