Specifications
AS-Interface
Power supply units and data decoupling modules
S22.5 data decoupling modules
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Siemens IK PI · 2012
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Overview
AS-Interface S22.5 double data decoupling modules
Left: screw terminal version, Right: spring-type terminal version
With the aid of the S22.5 data decoupling module, the
AS-Interface network can also be supplied with 24 V DC or
30 V DC from a standard power supply unit and the transmission
of data and power can be realized along one cable.
The combination of data decoupling modules and standard
power supply units is therefore a cost-efficient alternative to the
service-proven AS-Interface power supply units.
The quality of the data signals and the reliable operation of the
AS-i network are not negatively affected as the result.
Features of the S22.5 data decoupling module
• Degree of protection IP20
• Narrow design: 22.5 mm wide
• Version with screw or spring-type terminals
• Versions for single and double data decoupling
• Connection of several AS-Interface networks to one power
supply unit is possible
• Operation with 24 V DC or 30 V DC, grounded or
non-grounded
• Adjustable current limiting up to 2 x 4 A
• Integrated ground-fault detection with fault storage
• Diagnostics LEDs and signaling contacts
• Reset by button or remote reset
Ground-fault detection
The integrated ground-fault detection works with a grounded
and non-grounded supply: The connection of negative pole and
ground (upstream from the data decoupling module) customary
with 24 V DC power supplies is permitted. A ground fault to the
negative or positive pole on the AS-Interface network (down-
stream from the data decoupling module) is detected and stored
as a fault and will be signaled using LEDs and a relay contact.
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Benefits
• Compatible expansion of the AS-Interface system
• An existing standard power supply unit with 24 V DC or
30 V DC can be used for supplying AS-i networks
• The AS-Interface system can also be used in tightly budgeted
applications because no AS-Interface power supply unit
needs to be purchased
• Applications benefit in addition from the advantages of a
modern bus system:
- High level of standardization
- Additional diagnostics and maintenance information
- Faster commissioning
• Easy and cost-efficient construction of single and multiple
networks is possible
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Application
The AS-Interface data decoupling module is designed for
AS-Interface networks with 30 V supply or 24 V supply
(AS-Interface Power24V).
Operation of an AS-i network with the data decoupling module
and a 30 V DC standard power supply unit is technically equiv-
alent to the use of an AS-Interface power supply unit and offers
the service-proven features of AS-Interface for all applications.
AS-Interface Power24V uses a 24 V DC power supply unit in
conjunction with a data decoupling module and is particularly
suitable for
• Compact machines using AS-Interface input/output modules
• Applications in the control cabinet for AS-Interface integration
of SIRIUS Innovation contactors and compact feeders
(3RT2 contactors through 3RA27 function modules or
3RA6 compact feeders through AS-i 3RA69 add-on modules)
When using the double data decoupling module or additional
data decoupling modules, several AS-Interface networks can be
operated with a single power supply unit. This results in an ad-
ditional cost advantage.
Note:
The length of an AS-i Power24V network is restricted to 50 m in
order to limit the voltage drop along the cable.
AS-i masters, AS-i slaves and the sensors and actuators sup-
plied through the AS-i cable must be designed for the reduced
voltage. Sensors and actuators for the standard voltage range of
10...30 V can be supplied with sufficient voltage.
The power supply units must comply with the PELV Standard
(Protective Extra Low Voltage) and have a residual ripple of
< 250 mVpp. We recommend power supply units from the
SITOP range, see Catalog IC 10.
Kap_06_en.book Seite 136 Freitag, 2. September 2011 1:42 13
© Siemens AG 2011