ABB S800 I/O User Manual page 131

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• 2 fiber optic ports to optical ModuleBus
• ModuleBus (electrical) to the I/O Modules
• Supervisory functions of I/O ModuleBus and power supply
• Isolated power supply to I/O modules
• DIN rail mounting.
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The TB820 ModuleBus Modem is a communication interface for
connection of S800 I/O modules via the optical and electrical
ModuleBus.
The TB820 can be used in both a simplex optical configuration as
well as in a duplex optical configuration. In a simplex
configuration, the optical Modulebus nodes are connected in a ring.
In a duplex configuration, the optical Modulebus nodes are
connected in a row.
TB820 has two basic parts: Module termination board and the
power supply/communications board (see block diagram).
The termination board is a unit where most of the connections to
the outside takes place. It is grounded to the DIN-rail through a
metallic spring connector. The board carries screw terminals for power supply and redundant power
supply monitoring, connector for the electrical Modulebus, a current limit "fuse" for the +24V
supply of the I/O modules and the electrical Modulebus.
The power supply board has an isolated power converter that generates a short circuit proof +5V
supply for the TB820 and connected I/O modules. This board also contains the Modulebus
interfaces, LED indicators and one screwdriver maneuvered rotary switch for the Modulebus I/O
cluster address. The Modulebus I/O cluster address (1-7) is set by a rotary decimal code switch, any
other value than 1-7 is not allowed and will turn the Run LED off.
3BSE 020 923R101
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X1B
X1A
F R
P
ORx1 ORx2
ERx
CLUSTER
5
6
4
3 7
2
1
TB820
L+ L+ SA
SB
L- L-
X4 X5
Rx Rx
Tx Tx
121