Omron CJ2 - 02-2010 User Manual page 278

8 I/O Allocations and Unit Settings
I/O Allocation to CPU Bus Units
Each CJ-series CPU Bus Unit is allocated 25 words in the CPU Bus Unit Area (CIO 1500 to
CIO 1899) according the unit number set on the Unit. CPU Bus Units can be mounted to the CPU
Rack or Expansion Racks. The following table shows which words in the CPU Bus Unit Area are
allocated to each Unit.
Unit number
0
1
2
:
15
CPU Bus Units are ignored during I/O allocation to Basic I/O Units. Positions containing CPU Bus
Units are not allocated any words in the I/O Area. The unit numbers of CPU Bus Units are different
from the unit numbers of Special I/O Units. Using the same unit number for both a CPU Bus Unit and
a Special I/O Unit will not result in duplicate use of unit numbers.
Example
Slot Unit
0 16-point DC Input Unit
1 Analog Input Unit
2 Serial Communica-
tions Unit
3 16-point Transistor
Output Unit
4 Controller Link Unit
--- Built-in EtherNet/IP
port on CPU Unit *1
*1 With the CJ2H-CPU6@-EIP and CJ2M-CPU3@, words are allocated to the built-in EtherNet/IP port as a CPU Bus Unit.
These words are used to store the network communications status of the port. In the same way as with other CPU Bus
Units, the words are allocated according to the unit number set with the rotary switches on the front of the CJ2H-CPU6@-
EIP or CJ2M-CPU3@.
8-8
Number of words
25 CIO 1500 to CIO 1524
25 CIO 1525 to CIO 1549
25 CIO 1550 to CIO 1574
:
25 CIO 1875 to CIO 1899
0 1 2 3 4
CPU CPU
Special
IN OUT
Bus Bus
I/O
Unit Unit
16 pt 16 pt
Unit
CIO CIO
0000 2000 1500 0001 1525
to to to
2009 1524 1549
Words
Model
required
CJ1W-ID211 1
CJ1W-AD081 10
CJ1W-SCU41 25
CJ1W-OD211 1
CJ1W-CLK21 25
CJ2H-CPU68- 25
E1P
Words allocated
:
Words
allocated
CIO 0000 ---
CIO 2000 to 0
CIO 2009
CIO 1525 to 1
CIO 1549
CIO 0001 ---
CIO 1550 to 2
CIO 1574
CIO 1500 to 0
CIO 1524
CJ2 CPU Unit Software User's Manual
Unit
Group
number
Basic I/O Unit
Special I/O Unit
CPU Bus Unit
Basic I/O Unit
CPU Bus Unit
CPU Unit (The port
is treated as a CPU
Bus Unit.)