AS- Interface (AS-I)

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:

Features

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

Connection method

Contacting of the AS-Interface cable by insulation piercing method

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

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