NORD Drivesystems BU0180 - Manual (Page 71)

5 Commissioning
BU 0180 GB-0914 Pre-series version 71
5.4.3 Bus structure and topology
The AS interface network can be set up in any desired form. Linear, star, ring and tree structures are
possible. An existing network can be expanded by further slaves at any time. Up to 31 standard slaves (i.e.
a maximum of 124 binary sensors and 124 binary actuators) or 62 A/B slaves (i.e. a maximum of 248 binary
sensors and 248 binary actuators) can be connected to an AS interface network or an AS interface master.
Each AS interface slave has its own address
(1 to 31 (or 1A … 31A, 1B … 31B)), which is assigned to the
slave with the aid of an addressing device, or is transferred to the slave by means of a command from the
AS interface master. Each slave address may only be assigned once.
Normally the AS interface master is a component or module of the control unit and forms the interface
between the control unit and the connected slave. An AS-i master communicates independently and
exchanges data with the connected AS-i slave options. Normal power units must not be used in the AS
interface network. For each AS interface connector, only a special AS interface power units may be used for
the power supply. This AS interface power supply is directly connected to the yellow standard cable (ASI+
and ASI- cable) and should be positioned as close as possible to the AS-i master in order to keep the
voltage drop small.
NOTE
It is essential that the PE connection of the AS interface mains unit (if present) is earthed.
The brown ASi+ and the blue ASi- wire from of the AS interface cable must not be earthed.
AS Interface
Master
AS Interface
mains unit
Sensors Actuators Sensors Actuators
AS Interface
Slave (SK 190E)
AS Interface
Slave (SK 190E)
AS-Interface
yellow cable
Control unit /
Automation device
observe max.
power load