D Glossary
189
IE/AS−INTERFACE LINK PN IO as of hardware version 1, as of firmware version V2.0
Release 08/2018
C79000−G8976−C216−03
AS-i module
For the AS-Interface, a module concept has been defined that allows the block-
like linking of AS-i slaves − sensors and actuators − via AS-i modules.
The following types of module exist:
− The active AS-i module with an integrated AS-i chip; using this, up to four
conventional sensors and actuators can be connected.
− The passive AS-i module; this functions as a distributor and provides a con-
nection for up to four sensors and actuators with an integrated AS-i chip.
In keeping with the concept of the standard AS-i master and the extended AS-i
master, either AS-i chips 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 design (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.
CDI − Configuration data image
The CDI contains the current copies of the I/O configuration (input/output confi-
guration) and the identification codes (ID, ID1, ID2) of the AS-i slaves. The AS-i
master stores this list in volatile memory.
Combined Transaction Type (CTT)
Communication protocols on AS-Interface according to the Specification V3.0 for
the transfer of larger amounts of data (analog values, strings, etc.).
Extended AS-i master
An extended AS-i master (M4) 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 from SIMATIC NET support the integrated transfer of
AS-Interface analog slaves operating according to the profile 7.3, 7.4, 7.5.5,
7.A.5, B.A.5, 7.A.A, 7.A.8, 7.A.9 or 6.0 (Combined Transaction Types CTT 1−5
according to AS-i Specification V3.0).
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