Omron CV500 Installation Manual page 38

Racks
2-2-3 Expansion I/O Racks
I/O Connector Connects Expan-
sion I/O Rack to preceding Expan-
sion I/O, Expansion CPU, or CPU
Rack.
Termination Resistance Unit
A Termination Resistance Unit
must be connected to the unused
I/O Connecting Cable Connector
when an Expansion I/O Rack is
not connected.
I/O Connector Connects Expan-
sion I/O Rack to next Expansion
I/O Rack. When not used, connect
to a Termination Resistance Unit.
Single Expansion I/O Rack
Expansion I/O Racks, shown in the following diagram, can be used to expand
the CV-series PCs. There are five models of Expansion I/O Backplane that can
be used, as shown in the following table. These vary in the number of slots that
they provide for Units (other than the Power Supply Unit and I/O Interface Unit)
and in expansion capabilities. CV500 Expansion I/O Backplanes offer complete
expansion capabilities, while CVM1 Expansion I/O Backplanes do not support
I/O Interface Units and thus must be connected directly to the CPU Backplane
(see Single Expansion I/O Rack in this subsection).
Expansion I/O No. of slots
Backplane
CV500-BI042 4
CV500-BI062 6
CV500-BI112 11
CVM1-BI064 6
CVM1-BI114 11
An Expansion I/O Rack can be connected either directly to the CPU Backplane
(see Single Expansion I/O Rack in this subsection) or to an I/O Control Unit.Up to
seven Expansion I/O Racks can be connected to the I/O Control Unit on the CPU
Rack in two series unless an Expansion CPU Rack is connected, in which case
only six Expansion I/O Racks may be connected. If an Expansion CPU Rack is
connected, one of the series of Expansion I/O Racks is connected to the I/O
Control Unit on the CPU Rack and the other one is connected to the I/O Interface
Unit on the Expansion CPU Rack.
Attach a Termination Resistance Unit to the unused terminal on the I/O Interface
Unit of the last Expansion I/O Rack in each series. If two series of Expansion I/O
Racks are used, connect a Termination Resistance Unit to the last Rack in each.
I/O Interface Unit (CV500-II201)
Connects the Expansion I/O Rack to
other Expansion Racks, the CPU Rack,
and/or an Expansion I/O Rack.
If only one Expansion I/O Rack is required and no Expansion CPU Rack is used,
a single Expansion I/O Rack can be connected directly to the CPU Rack without
an I/O Control Unit or I/O Interface Unit. The Racks are connected directly via the
connectors on the two Backplanes. Termination Resistance Units are also not
required. In every other respect, the Expansion I/O Rack is identical to Expan-
sion I/O Racks in connected via I/O Control and I/O Interface Units.
I/O Interface Unit
Yes
Yes
Yes
No
No
Units
(Up to 4/6/11 or the following
Units: C500 I/O Units, C500
Special I/O Units, SYSMAC
BUS Masters)
Section 2-2
Expansion I/O
Backplane
CV500-BI042/062/
112 or
CVM1-BI064/114
Power Supply Unit
CV500-PS221/PS211
or CVM1-PA208
25