SIEMENS
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Siemens IC 10 · 2017
AS-Interface
Power Supply Units and Data Decoupling Modules
S22.5 data decoupling modules
2
■
Overview
AS-Interface S22.5 double data decoupling module:
Screw-type terminal version (picture left),
spring-loaded terminal version (picture right)
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 unit
•
Degree of protection IP20
•
Narrow design: 22.5 mm wide
•
Version with screw or spring-type terminals
•
Versions for single and double data decoupling
•
Supply of several AS-i networks with a single power supply
unit
•
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.
■
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 design of single and multiple networks
is possible
■
Application
The AS-Interface data decoupling module is designed for
AS-Interface networks with 30 V or 24 V supply (AS-i Power24V).
Operation of an AS-i network with the data decoupling module
and a 30 V standard power supply unit is technically equivalent
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 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 Innovations contactors and compact starters (3RT2
contactors through 3RA27 function modules or 3RA6 compact
starters through 3RA69 AS-i add-on modules)
When using the double data decoupling module or other data
decoupling units, several AS-Interface networks can be oper-
ated with a single power supply unit. This results in an additional
cost advantage.
Note:
The power supply units must comply with the PELV (Protective
Extra Low Voltage) or SELV (Safety Extra Low Voltage) stan-
dards, have a residual ripple of < 250 mV
pp
, and in the event of
a fault must limit the output voltage to a maximum of 40 V. We
recommend SITOP power supplies
(see page 15/1 onwards)
or
PSN130S 30 V power supplies
(see page 2/83 onwards)
.
Note on AS-i Power24V:
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 to 30 V can be supplied with sufficient voltage.
Please also observe the requirements specified in "Extension of
AS-i Power24V" for implementation of AS-i Power24V,
see
page 2/21
.
For more information on AS-i Power24V
, see
"AS-Interface System Manual",
.
© Siemens AG 2016