Omron CJ1W-EIP21 Operation Manuals page 109

Precautions for Correct Use Precautions for Correct Use
• If the IP address is duplicated or not set correctly, communications are not possible via the
EtherNet/IP network.
• The IP address range shown below is used by the system and cannot be specified.
169.254.0.0 to 169.254.255.255
192.168.255.0 to 192.168.255.255
• Due to Ethernet restrictions, you cannot specify the IP addresses that are described below.
• An IP address that is all 0's or all 1's
• IP addresses that start with 127, 0, or 255 (decimal)
• An IP address with a host ID that is all 0's or all 1's
• An IP address with a network ID that is all 0's or all 1's
• Class-D IP addresses (224.0.0.0 to 239.255.255.255)
• Class-E IP addresses (240.0.0.0 to 255.255.255.255)
 Connecting from a Saved Project
The connection configuration that is set (USB or EtherNet/IP) is saved in the project. (The file is
xxx.smc.) If you open a saved project on the Sysmac Studio, you can connect to the EtherNet/IP
network without redoing the settings.
 Checking the Current IP Address
You can use the following device variable for the CJ-series Unit to check the IP address that is set for
the EtherNet/IP Unit.
Device variable name for CJ-
series Unit
*_IPAdrCfg
*_IPAdr1Cfg
*_IPAdr2Cfg
*_IPAdr3Cfg
*_IPAdr4Cfg
The IP address is stored as shown below.
Byte
First byte
First byte + 1
IP Address: (1).(2).(3).(4) (hex)
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
Data
type
DWORD
USINT
USINT
USINT
USINT
15 14 13 12 11 10 9 8
(1)
(3)
4 Determining IP Addresses
R/W Meaning
RW IP address dis-
play/setting area
RW IP Address 1
RW IP Address 2
RW IP Address 3
RW IP Address 4
7 6 5 4 3 2 1 0
(2)
(4)
Description
Default: 00000000
Part (1) of the IP Address of the Eth-
erNet/IP Unit
Part (2) of the IP Address of the Eth-
erNet/IP Unit
Part (3) of the IP Address of the Eth-
erNet/IP Unit
Part (4) of the IP Address of the Eth-
erNet/IP Unit
4
4-9