Omron SYSMAC C200H CPU01-E Installation Manual page 40

Mounting the Units
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This Backplane has I/O Units mounted to it, but it has no CPU of its own. The
additional Backplane must also have an Expansion I/O Power Supply mounted
to its rightmost position. This configuration of additional Backplane, Expansion
I/O Power Supply, and I/O Units is called an Expansion I/O Rack.
The CPU Rack and Expansion I/O Rack shown above are connected by a Con-
necting Cable (the length of Cable between individual Racks can be up to 10 m,
but the total length of Cable between all Racks must be within 12 m).
Remember that this whole configuration is still referred to as one PC. It is possi-
ble to add up to two Expansion I/O Racks to one CPU Rack. When installing I/O
Connecting Cables, cover any unused connectors with the caps provided.
Section 3-1