Section 2 Product Description ModuleBus
3BSE015969-600 A 77
ModuleBus
TB820/TB820V2 ModuleBus Modem
The TB820/TB820V2 ModuleBus Modem is a fiber optic interface to the
ModuleBus. The ModuleBus Modem has an electrical and an optical interface
which are logically the same bus. A maximum of 12 I/O modules can be connected
to the electrical ModuleBus and up to seven clusters can be connected to the fiber
optic ModuleBus.
The TB820/TB820V2 ModuleBus Modem has a rotary switch that selects its cluster
number, 1 to 7, on the Optical ModuleBus.
The ModuleBus Modem communicates with the FCI or Controller via the
Optical ModuleBus.
The TB820/TB820V2 ModuleBus Modem provides 24 V d.c. protected (from the
source) and an isolated, protected 5 V d.c. power to the cluster’s I/O modules by
way of the electrical ModuleBus connection. One power source (single or redundant
24 V d.c.) can be connected to the power terminals (L+ & L-). The redundant power
supply can be supervised via inputs SA and SB.
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