SIEMENS
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Siemens IK PI · 2015
AS-Interface
Network transitions
DP/AS-Interface Link 20E
4
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Overview
DP/AS-Interface Link 20E
DP/AS-Interface Link 20E connects PROFIBUS DP to
AS-Interface and has the following features:
•
PROFIBUS DP slave and AS-Interface master
•
Up to 62 AS-Interface slaves, each with 4 digital inputs and
4 digital outputs as well as analog slaves can be connected
•
Integrated analog value transmission (all analog profiles)
•
Supports all AS-Interface master functions according to
the AS-Interface Specification V3.0
•
Supply from AS-Interface cable; hence no additional power
supply required
•
Suitable for AS-i Power24V (from product version 2 / firmware
version 3.1) and for Standard AS-i
with 30 V voltage
•
Supports the uploading of the AS-Interface configuration in
STEP 7 V5.2 and higher
Design
•
Compact plastic enclosure in degree of protection IP20 for
standard rail mounting
•
LEDs in the front panel for indicating the operating state and
functional readiness of all connected slaves
•
Setting of PROFIBUS DP address is possible by pressing a
button
•
LED indication of the PROFIBUS DP slave address, DP bus
faults and diagnostics
•
Two pushbuttons for switching over the operating state and for
adopting the existing ACTUAL configuration as the DESIRED
configuration
Functionality
Communications
The DP/AS-Interface Link 20E enables a DP master to access all
the slaves of an AS-Interface network.
The DP/AS-Interface Link 20E occupies a standard 32 bytes of
input data and 32 bytes of output data in which the digital I/O
data of the connected AS-Interface slaves (standard and A/B
slaves) of an AS-i line are stored.
The size of the input/output image can be compressed so that
only the actually required I/O address area is occupied in the
system of the DP master.
The analog I/O data can be accessed with the S7 system
functions for read/write data records.
Configuration
The DP/AS-Interface Link 20E is configured as follows:
•
With STEP 7 as of Version V5.1 SP2:
With STEP 7 configuring the AS-Interface configuration
can be uploaded in STEP 7 V5.2 and higher. Furthermore,
AS-Interface slaves from Siemens can also be conveniently
configured in HW Config (slave selection dialog).
•
By adopting the ACTUAL configuration of the AS-Interface by
using the SET pushbutton on the front panel
•
Alternatively, DP/AS-Interface Link 20E can be integrated by
means of the PROFIBUS GSD file in the engineering tool
(e.g. for STEP 7 V5.1 and lower or for non-Siemens engineer-
ing tools).
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Benefits
•
Reduction of installation costs because the power is supplied
entirely via the AS-Interface cable, which means that no addi-
tional power supply is required.
•
Short startup times thanks to easy configuration at the touch
of a button
•
The LED indicators help reduce downtime and service times if
a slave fails.
•
Easy and fast startup through reading out the AS-Interface
configuration
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Application
The DP/AS-Interface Link 20E is a PROFIBUS DP slave (accord-
ing to IEC 61158 / IEC 61784) and an AS-Interface master
(according to IEC 62026-2). It enables the AS-Interface to be
operated on PROFIBUS DP.
DP/AS-Interface Link 20E can operate up to 248 DI/248 DO
when using 62 A/B slaves with 4DI/4DO each.
PROFIBUS DP masters (DP-V0) can exchange digital I/O data
cyclically with the AS-Interface.
PROFIBUS DP masters with acyclic services (DP-V1) are also
able to exchange analog I/O data and initiate AS-Interface
master calls (e. g. reading/writing the AS-i configuration
during normal operation).
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© Siemens AG 2014