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Switch Settings Section 3-4
Unit Number and CPU Bus
Unit Allocations
With CJ-series PCs, words are automatically allocated in the CIO Area and
the DM Area. The Ethernet Unit uses these words for receiving control data
from the CPU Unit and for notifying the CPU Unit of Ethernet Unit and com-
munications status. The word addresses in the allocated areas for the CPU
Bus Unit are important in creating the user program for using the Ethernet
Unit, so be careful to take them into account when setting the unit number.
The following table shows the areas allocated for the CPU Bus Unit by unit
number. This table only shows the correspondences between unit numbers
and the areas allocated for the CPU Bus Unit. For more details, refer to Sec-
tion 4 System Setup and Memory Allocations.
CIO Area Allocations
DM Area Allocations
Setting the Node Number
With the FINS communications service, when there are multiple Ethernet
Units connected to the Ethernet network, the Ethernet Units are identified by
node numbers. Use the node number switches to set the node number
between 01 and 7E hexadecimal (1 to 126 decimal). Do not set a number that
has already been set for another node on the same network.
The top switch sets the sixteens digit (most significant digit) and the bottom
switch sets the ones digit (least significant digit). The node number is factory-
set to 01.
Unit No.
(decimal)
Allocated words Unit No.
(decimal)
Allocated words
0 (0) CIO 1500 to CIO 1524 8 (8) CIO 1700 to CIO 1724
1 (1) CIO 1525 to CIO 1549 9 (9) CIO 1725 to CIO 1749
2 (2) CIO 1550 to CIO 1574 A (10) CIO 1750 to CIO 1774
3 (3) CIO 1575 to CIO 1599 B (11) CIO 1775 to CIO 1799
4 (4) CIO 1600 to CIO 1624 C (12) CIO 1800 to CIO 1824
5 (5) CIO 1625 to CIO 1649 D (13) CIO 1825 to CIO 1849
6 (6) CIO 1650 to CIO 1674 E (14) CIO 1850 to CIO 1874
7 (7) CIO 1675 to CIO 1699 F (15) CIO 1875 to CIO 1899
Unit No.
(decimal)
Allocated words Unit No.
(decimal)
Allocated words
0 (0) D30000 to D30099 8 (8) D30800 to D30899
1 (1) D30100 to D30199 9 (9) D30900 to D30999
2 (2) D30200 to D30299 A (10) D31000 to D31099
3 (3) D30300 to D30399 B (11) D31100 to D31199
4 (4) D30400 to D30499 C (12) D31200 to D31299
5 (5) D30500 to D30599 D (13) D31300 to D31399
6 (6) D30600 to D30699 E (14) D31400 to D31499
7 (7) D30700 to D30799 F (15) D31500 to D31599
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
NODE
No.
x16
1
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
x16
0
Setting range:
01 to 7E (1 to 126 decimal)