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Switch Settings Section 3-4
3-4 Switch Settings
This section explains how to set the various switches on the Ethernet Unit.
3-4-1 CS-series Ethernet Units
Setting the Unit Number
The unit number is used to identify individual CPU Bus Units when more than
one CPU Bus Unit is mounted to the same PC. Use a small screwdriver to
make the setting, taking care not to damage the rotary switch. The unit num-
ber is factory-set to 0.
Note 1. Turn OFF the power supply before setting the unit number.
2. If the unit number is being set for the first time or changed, then an I/O table
must be created for the PC.
Unit Number and CPU Bus
Unit Allocations
With CS-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
TS
(Internode Testing)
Yellow Not lit Not running internode test.
Lit Running internode test.
Indicator Color Status Meaning
Setting range:
0 to F
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