# What is AS-interface?

**URL:** <https://forumautomation.com/t/what-is-as-interface/1692>\
**Category:** Industrial Networking\
**Created:** [January 22, 2017, 7:03am UTC](https://forumautomation.com/t/what-is-as-interface/1692 "2017-01-22T07:03:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![denizen](https://forumautomation.com/letter_avatar_proxy/v4/letter/d/848f3c/32.png) [@denizen](https://forumautomation.com/u/denizen)\
**Post date:** [January 22, 2017, 7:03am UTC](https://forumautomation.com/t/what-is-as-interface/1692/1 "2017-01-22T07:03:03Z")

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AS-Interface stands for Actuator Sensor Interface.

AS-I is an industrial networking protocol used in PLC ,DCS and other PC based automation system.’

A single cable is enough to connect I/O modules from any manufacturer.

AS Interface is alternative to the hard wiring of field device.

 ![](https://cdn.forumautomation.com/original/1X/3b9a525aca5f0f862a580448b94bf9e839b3fe5e.jpg)

AS interface is an open protocol.More than 300 plc vendors supports AS interface.

Highlights of AS Interface- Simple network to reduce wiring by 90%. First certified safety and standard i/o solution Connections to all important PLCs Fast and deterministic

AS interface basics- Two wire power and data network. Topology free,allowing any cable paths. Network segment can have 100m cable. Multiple segments can be connected. Work with nearly all PLCs.