Specifications

AS-Interface
Network transitions
DP/AS-Interface Link 20E
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Siemens IK PI · 2012
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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
• 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 option for PROFIBUS DP address 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
Communication
DP/AS-Interface Link 20E enables a DP master to access all the
slaves of an AS-Interface network.
DP/AS-Interface Link 20E occupies as standard 32 bytes of in-
put 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 func-
tions for read/write data record.
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. Can also be AS-Interface
slaves from Siemens conveniently configure in HW Config
(slave selection dialog).
• By adopting the ACTUAL configuration of the AS-Interface by
the 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).
■ Benefits
• Reduction of installation costs because the power supply
comes completely from the AS-Interface cable, making an ad-
ditional power supply superfluous
• Short start-up times through simple configuration at the press
of a button
• Reduction of standstill and servicing times in the event of a
slave failure thanks to the LED indicators
• Easy and fast start-up through reading out the AS-Interface
configuration
■ Application
The DP/AS-Interface Link 20E is a PROFIBUS DP slave
(according 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 I/O data with
AS-Interface in cyclic mode.
PROFIBUS DP masters with acyclic services (DP-V1) are able in
addition to initiate AS-Interface master calls (e. g. reading/
writing the AS-i configuration during normal operation).
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