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Siemens IC 10 · 2017
AS-Interface
Introduction
AS-Interface Specification
Specification V3.0
2
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Overview
Scope of AS-Interface Specification V3.0
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, so no special adjustments
are required of the user.
•
One digital AS-i
slave typically has up to four digital inputs and
four digital outputs.
•
Transmission of the digital input/output data requires
max. 5 ms cycle time for 31 slaves; for further values,
see "Communication cycle"
.
•
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 of 10 ms will be required to update 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,
see "Selection and
ordering data" of the relevant slave
.
Available masters with the latest AS-Interface specification V3.0
•
CM AS-i Master ST, F-CM AS-i Safety ST (ET 200SP)
•
CM 1243-2 (S7-1200)
•
CP 343-2, CP 343-2P (S7-300 / ET 200M)
• IE/AS-i LINK PN IO
• DP/AS-i LINK Advanced
• DP/AS-i F-Link
•
DP/AS-Interface Link 20E
■
More information
Maximum number of slaves
Number of digital
inputs
Number of digital
outputs
Digital
Analog
ASIsafe
DI
DQ
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
More information
"AS-Interface" system manual
• German
• English
© Siemens AG 2016