ABB S800 I/O User Manual page 22

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The TB820 ModuleBus Modem has a rotary switch that selects its cluster number, 1
to 7, on the optical ModuleBus.
Power Supply
Connections
The ModuleBus Modem communicates with the CI810 FCI via a TB810, or
theTB815 Interconnection Unit via a TB810, and to the I/O modules. The FCI
handles the I/O-modules operations such as read and write data, read status and
configuration of modules and channels.
12
DIN Rail
TB820
L+ L+ SA
L- L-
Redundant Power
Supervision
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Figure 1-5 shows the layout of TB820.
F R
P
ORx1 ORx2
ERx
CLUSTER
5
6
4
Cluster Address
3 7
2 Switch
1
SB
X4 X5
Rx Rx
Tx Tx
Optical ModuleBus
Interface Connector
LED Status
Indicators
Electrical ModuleBus
Interface Connector
(Address 4 shown)
3BSE 020 923R101