ABB S800 I/O User Manual page 84

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An I/O cluster may be divided into smaller parts to fit a particular requirement, but
the 2.5 meter (8.2 feet) maximum must be observed at all times. The cluster may be
distributed because of space limitations or to keep signal types together.
See Figure 3-3
Cable Adaptor, out
TB805
Cable Adaptor, in
TB806
The first unit of the I/O Station is the Fieldbus Communications Interface (FCI).
It connects to the fieldbus and is the communications interface to the I/O modules.
The FCI controls the ModuleBus and provides power to the logic-side of the I/O
modules. The FCI is a station on the fieldbus and must be set to the correct address.
Refer to respective FCI manual for more information.
The FCI connects to the first MTU. Additional MTUs connect to each other or
through the ModuleBus Extension cable, up to a maximum of 12. The ModuleBus is
terminated by the TB807 Bus Terminator module. The I/O Modules are installed
onto the MTUs and connected to the process in the field.
74
for a example of an I/O cluster divided up into four groups.
TK801V0xx
Analog Outputs
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Terminator
TB807
Digital Outputs
3BSE 020 923R101