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Allocating First Words to Racks Section 8-4
Example: Setting the First Words for Racks
Rack First Word Settings
Note Rack numbers (0 to 3) are fixed according to the order that the Racks are
physically connected with cable. The CPU Rack is always Rack 0 and the
other Racks are, in order, Racks 1 to 3. These numbers cannot be changed.
Setting First Rack Words from the CX-Programmer
The first word allocated on each Rack can be set from the CX-Programmer.
These settings are not possible from a Programming Console.
Note For CJ1-H CPU Units, an indication of whether or not the first rack words have
been set will be displayed on a Programming Console.
Use the following procedure to set the first rack words.
Rack First word
CPU Rack CIO 0100
Rack 1 CIO 0120
Rack 2 0000
Rack 3 0140
01234
0123
01234
01234
CIO
0100
CIO
0101
CIO
0104
CIO
0103
CIO
0102
CIO
0200
CIO
0202
CIO
0203
CIO
0201
CIO
0000
CIO
0004
CIO
0003
CIO
0002
CIO
0001
CIO
0140
CIO
0144
CIO
0143
CIO
0142
CIO
0141
I/O Control Unit
Power Supply Unit
CPU Rack
(Rack 0)
Rack 1
Rack 2
Rack 3
First Rack word set to CIO 0100.
First Rack word set to CIO 0120.
First Rack word not set (automatic allocation from CIO 0000).
First Rack word set to CIO 0140.
I/O Interface Unit
Power Supply Unit
Power Supply Unit
CPU UNIT
I/O Interface Unit
Power Supply Unit
I/O Interface Unit
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