Siemens DP/AS-Interface Link 20E Manual page 153

AS-i module
For the AS-Interface, a module concept has been defined that allows the block-
type linking of AS-i slaves – sensors and actuators – via AS-i modules.
The following types of module exist:
Active AS-i modules with integrated AS-i chip: These are used to attach up to
four conventional sensors and four conventional actuators.
Passive AS-i modules: These function as distributors and allow attachment of up
to four sensors and actuators with AS-i chips.
In keeping with the concept of the standard AS-i master and the extended AS-i
master, either AS-i chaps with standard functions or with extended functions are
used in the AS-i slaves.
AS-i slave
All the nodes that can be addressed by an AS-i master are known as AS-i
slaves.
AS-i slaves are distinguished by their packaging (AS-i modules and sensors or
actuators with an integrated AS-i attachment) and their address range (AS-i
standard slaves and AS-i A/B slaves with the extended addressing mode).
AS-i standard slave
An AS-i standard slave always occupies one address on the AS-Interface; with
this address organization, up to 31 AS-i standard slaves can be attached to the
AS-Interface.
Extended AS-i master
An extended AS-i master supports 31 addresses that can be used for standard
AS-i slaves or AS-i slaves with the extended addressing mode. This increases
the number of addressable AS-i slaves to a maximum of 62.
The extended AS-i masters of SIMATIC NET support the integrated transfer of
AS-Interface analog slaves that operate in compliance with Profile 7.3/7.4 of the
AS-Interface Specification.
LAS
List of activated slaves.
LDS
List of detected slaves.
DP/AS-Interface Link 20E
Release 11/2002
C79000-G8976-C138–04
Glossary
153