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Siemens IK PI · 2015

AS-Interface

Introduction

AS-Interface specification

Specification V3.0

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Overview

Scope of the AS-Interface specification

Basic data

AS-Interface Specification 3.0 describes a fieldbus system with

an AS-i master and up to 62 AS-i slaves.

• The standard slaves continue to occupy one AS-i address

(1...31).

• Slaves with extended addressing divide an address into an

A address (1A...31A) and a B address (1B...31B). Up to 62

A/B slaves can be connected accordingly to one AS-Interface

network.

• Mixed operation of standard slaves and A/B slaves is possible

without difficulty. The AS-i master identifies automatically

which type of slave is connected. No special adjustments are

required of the user.

• A digital AS-i slave has up to 4 digital inputs and 4 digital

outputs.

• Transmission of digital input/output data requires a cycle time

of max. 5 ms with 31 slaves, see "Communication cycle" for

further values.

• Integrated analog value transmission permits access to both

analog values and digital values without the need for any

special function blocks.

Communication cycle

Each address is queried in max. 5 ms cycle time. If two A/B

slaves are operated on one basic address (e.g. 12A and 12B), a

maximum 10 ms will be required for updating the data of both

slaves.

All slave types can be mixed and used on a single AS-Interface

network.

For more information, for example, to find out whether an

AS-Interface slave is a standard or A/B slave, refer to "Selection

and ordering data" of the relevant slave.

Available masters with the latest AS-Interface specification V3.0

• CP 343-2, CP 343-2P (S7-300 / ET 200M)

• DP/AS-i LINK Advanced

• DP/AS-i F-Link

• DP/AS-Interface Link 20E

• IE/AS-i LINKPNIO

• CM 1243-2 (S7-1200)

• CM AS-i Master ST (ET 200SP)

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More information

AS-Interface system manual

The AS-Interface system manual is available as a free download.

• German

http://support.automation.siemens.com/WW/view/de/26250840

•English

http://support.automation.siemens.com/WW/view/en/26250840

Maximum number of slaves Number of

digital inputs

Number of

digital outputs

Digital Analog ASIsafe DI DO

62 62 31 62  8 = 496 62  8 = 496

Maximum cycle time (digital signals)

• 5 ms with 31 slaves

• 10 ms with 62 slaves

• Up to 20 ms for A/B slaves with 4DI/4DO

• Up to 40 ms for A/B slaves with 8DI/8DO

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