bihl+Wiedemann AS-i/Modbus Gateway, User Manual, Page: 16 / 60

AS-i/Modbus Gateway Connections, Displays and Operating Keys
Subject to reasonable modifications due to technical advance. Copyright Bihl+Wiedemann, Printed in Germany
Bihl+Wiedemann GmbH · D-68199 Mannheim · Tel. +49-621-339960 · Fax +49-621-3392239 · Internet http://www.bihl-wiedemann.de
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J+, J- Jumpers for selecting the power supply of AS-i
"int pwr" position (closed):
AS-i is powered by the master power supply.
Master power supply and AS-i network are then decoupled with coils.
"ext pwr" position (open):
With the jumper open (or missing), the AS-i network must be powered by
a separate AS-i power supply.
The AS-i power supply can be connected to the jumper or to the AS-i cable
in the field.
Operation without AS-i power supply
When the jumpers are in position "int pwr", the AS-i network is powered by the mas-
ter's power supply. For test purposes, it is possible to use a conventional 24 V DC
power supply to supply the AS-i network. You get optimum results with a 30 V DC volt-
age source.
For the following wiring scheme the current through the AS-i mas-
ter must not exceed 2.8 A.
AS-i Master
-
+
Master
power
supply
max. 2.8 A
29.5 - 31.6 V DC
PELV according to EN 60950
(Protective extra low voltage)
AS-i Slave
-
+