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The Modulebus has an electrical and an optical interface which are logically the same bus.
A maximum of twelve I/O modules can be connected to the electrical Modulebus and up to seven
clusters can be connected to the fiber optic Modulebus expansion. The fiber-optical interface is
intended for local distribution of I/O clusters and where more than 12 I/O modules per station are
required. Any distribution of I/O modules across the base cluster and the remote cluster(s) is
allowed, however not more than 24 I/O modules per station can be used.
The module is equipped with optical Transmitter/Receiver for up to 10 Mbit/s. Both plastic and HCS
(Hard Clad Silica) optic fiber with connectors (HP Versatile Link) can be used with TB820.
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Power input 24V d.c. (19.2 - 30)
Power consumption at 24V d.c. 100 mA
Power dissipation 2.4 W
Power supply monitoring inputs Max. input voltage: 30V
Min. input voltage for high level: 15 V
Max. input voltage for low level: 8 V
Power output (ModuleBus) 24V max. = 1.5A
5V max. = 1.25A
Electrical ModuleBus Maximum of 12 I/O modules
Optical ModuleBus
Fiber optic interface, two transmitters
and two receivers for
Maximum of 7 I/O clusters
Max. 10 Mbit/s