ABB S800 I/O User Manual page 87

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The TB820 ModuleBus Modem needs to be connected to the CI810/CI830 FCI, or
the TB815 Interconnection Unit, and have an I/O cluster address selected. It is also
connected to a 24V d.c. power source to provide power to the I/O modules of the
cluster.
3BSE 020 923R101
TB820
L+ L+ SA
SB
L- L-
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F R
P
ORx1 ORx2
ERx
CLUSTER
5
4 6
Cluster Address
3 7
2
Switch
1
(Address 4 shown)
X4 X5
Rx Rx
Tx Tx
Optical ModuleBus
Interface Connector (X4, X5)
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