Rockwell Automation AADvance Controller Solutions Handbook - Manual (Page 129)

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Document: 553631
(ICSTT-RM447J_EN_P) Issue: 09:
9-3
Base Units, DIN Rail installations and Expansion Cables
Base units fit together side by side. One I/O base unit can be fitted directly onto the
right hand edge of the processor base unit. The second and subsequent base units
connect directly to the right of this first I/O base unit. If required, termination
assemblies can bridge adjacent I/O base units to save space.
Using Expansion Cables
A further eight I/O base units can be connected through an expansion cable to the left-
hand edge of the processor base unit.
The expansion bus accessed from the right hand edge of the 9100 processor base unit
is designated bus 1, while the bus accessed from the left hand edge is designated bus 2.
The module positions (slots) within the I/O base units are numbered from 01 to 24,
the left most position being slot 01. Any individual module position within the
controller can thus be uniquely identified by the combination of its bus and slot
numbers, for example 1-01.
The expansion cable assemblies are two metres long. The maximum possible length of
an entire bus (the combination of I/O base units and expansion cables) is 8 metres.
This is limited by the electrical characteristics of the interface.
Assemblies of Base Units
When base units are installed adjacent to each other they are physically connected by
mating connectors and retaining clips so the entire unit forms a single mechanical
assembly. Once the base units and termination assemblies have been installed, the
insertion and removal of modules will not disturb other electrical connections.