16
2-3 Expansion I/O Rack
The Backplane used to construct a CPU Rack is also used to construct an Ex-
pansion I/O Rack. An Expansion I/O Rack is identical to a CPU Rack, except the
CPU Unit has been replaced with a Power Supply. The parts of an Expansion I/O
Rack are shown in the following diagram.
I/O Connecting Cable connector:
Connects Expansion I/O Rack to
next Expansion I/O Rack. When
not used, cover with a cap.
Backplane mounting screws
(four, with 4-mm dia. heads)
Power Supply
Backplane
I/O Units
I/O Connecting Cable connector:
Connects Expansion I/O Rack to
preceding Expansion I/O Rack or to CPU
Unit.
Expansion I/O Rack Section 2-3
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