ABB DCS880 series - DDCS Branching Unit NDBU-95

Technical data
94
3ADW000462R0401 DCS880 Hardware manual e d
DDCS branching unit NDBU-95
The NDBU-95 is used to implement star topology for DDCS communication. This allows a drive to fail or
become unpowered without disabling the complete communication. The NDBU-95 receives messages from the
master (e.g. PC) and sends them to all the drives simultaneously. Each drive has an individual address and
only the addressed drive sends a reply message to the master.
NDBU-95 has nine output channels. The reply message sent by a drive is delivered to the master. Several
NDBU-95s can be used in parallel, in series or in any combination of these. The maximum distance between
the master and a NDBU-95 as well as between two NDBU-95s, see manual Branching units NDBU-95
.
Technical data Layout of the NDBU-95
Optical links:
Master channels 1 DDCS input and 1 DDCS out-
put
Drive channels 9 DDCS inputs and 9 DDCS
outputs
Data rate 1 ... 4 Mbit/s, (see X12)
Driving current 20 mA, 30 mA, 50 mA, channel
disabling, (see X2 ... X11)
Monitoring A green LED for each channel is
switched on, when messages are
received
Transmission device 10 Mb components
Power supply:
Input voltage +24 V
DC
±10 %
Input current 300 mA
Monitoring A green LED is switched on,
when the output voltage is normal
Operating temperature: +0 ... +50°C
Dimensions: See diagram
Note: Only channels with the same hardware
components (e.g. 10 Mb component) are
allowed to be connected together.
For further information see Branching units NDBU-95
.
41
94
DBU
264
V120
V119
V118
V117
V116
V115
V114
V113
V112
V111
V110
V109
V108
V107
V106
V105
V104
V103
V102
V101
X1
8
1
CH8
CH7
CH6
CH5
CH4
CH3
CH2
CH1
RXD
MSTR
24 V DC
S1
NDBU-95
DDCS
BRANCHING
UNIT, 8+1 CH
CH0
1
20 V
TXD
RXD
TXD
RXD
TXD
RXD
TXD
RXD
TXD
RXD
TXD
RXD
TXD
RXD
TXD
TXD
RXD
TXD
RXD
+5V OK
X2-
X11
TRANSM
SETTING
DIS
LONG
MEDIUM
SHORT
10
ADDRESS
+
+
+
+
+
+
+
+
X12
+
+
+
+
+
+
+
+
124
MBIT/S