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Switch Settings Section 3-2
3-2 Switch Settings
3-2-1 CS-series EtherNet/IP 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 PLC. 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 I/O tables
must be created for the PLC.
(3) With CS-series and CJ-series PLCs, words are automatically allocated in
the CIO Area and DM Area according to the unit numbers that are set.
For details, refer to SECTION 4 Memory Allocations.
Setting the Node Address
When there are multiple EtherNet/IP Units or Ethernet Units connected to the
Ethernet network for the FINS communications service, the EtherNet/IP Units
are identified by node addresses. Use the node address switches (NODE
NO.) to set the node address between 01 and FE hexadecimal (1 to 254 deci-
mal). Do not set a number that has already been set for another node on the
same network.
The left switch sets the sixteens digit (most significant digit) and the right
switch sets the ones digit (least significant digit). The node address is factory-
set to 01.
Note Turn OFF the power supply before setting the node address.
Relationship to IP
Addresses
When IP addresses are generated automatically (either dynamic or passive),
the rightmost byte of the host ID of the IP address is set to the same value as
the node address. (Refer to Section 5 Determining IP Addresses.) If the same
node address value cannot be used, the IP address table method or the com-
bined method must be used for address conversion. (For details, refer to SEC-
TION 5 Determining IP Addresses.)
If the FINS communications service is not being used on the Ethernet net-
work, then it is all right for the same node address to be set on two or more
EtherNet/IP Units. The setting, however, must be made within a range of 01 to
FE. If a value outside of this range is set, the MS indicator will light red, the 7-
segment display will indicate code H4 (node address setting error), and the
EtherNet/IP Unit will stop operating.
UNIT
No.
Setting range:
0 to F
NODE
NO.
× 16
1
× 16
0
Setting range:
01 to FE (1 to 254 decimal)