Cj-Series Ethernet Units - Omron CJ1W-ETN21 - 04-2009 Operation Manual

Switch Settings
2-2-2

CJ-series Ethernet Units

Setting the Unit Number
Note
Setting the Node Address
Note
Relation to IP Addresses
32
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.
(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, dedicated areas are automatically
allocated in the CIO Area and DM Area according to the unit numbers that
are set. For details, refer to SECTION 4 Ethernet Unit Memory Alloca-
tions.
With the FINS communications service, when there are multiple Ethernet
Units connected to the Ethernet network, the Ethernet Units are identified by
node addresses. Use the node address switches to set the node address
between 01 and FE hexadecimal (1 to 254 decimal). Do not set a number that
has already been set for another node on the same network.
• Unit Version
1.5 or Later
NODE
4 4
No.
1
x16 x16
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.
Turn OFF the power supply before setting the node address.
When using the automatic generation method (either dynamic or passive) for
address conversion, set the rightmost byte of the IP address set for the Ether-
net Unit to the same value as the node address. If this is not possible, either
the IP address table method or the combined method must be used for
address conversion. (For details, refer to 5-2 IP Addresses in FINS Communi-
cations.) If the FINS communications service is not used on the Ethernet net-
work, then it is all right to overlap with other Ethernet Units. The setting,
however, must be made within a range of 01 to FE. If a value outside of this
range is set, the ERC indicator will light.
UNIT
4
Setting range:
No.
0 to F
• Unit Version
1.4 or Earlier
NODE
4
No.
0 1
x16
4
0
x16
Section 2-2
Setting range
01 to FE (1 to 254 decimal)