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DM Area Allocations Section 4-4
be stored here and the ERC indicator will flash. (Refer to Setting the Local IP
Address.)
CJ-series Ethernet Units
IP address: 12.34.56.78 (Hex)
If the local IP address in the CPU Bus Unit System Setup is set to a value
other than 00.00.00.00, this area (words m+98 and m+99) will act as an IP
Address Display Area and the local IP address set in the CPU Bus Unit Sys-
tem Setup will be read and stored here when the power is turned ON or the
Unit restarted. If the local IP address in the CPU Bus Unit System Setup is set
to 00.00.00.00 (the default setting), this value is read by the Ethernet Unit
when the power is turned ON or the Unit restarted and is used as the local IP
address.
Note Choose the method used to set the local IP address as follows:
Set the local IP address in the CPU Bus Unit System Setup when making
other settings in the CPU Bus Unit System Setup (i.e., the default settings are
not used). The settings are made with CX-Programmer.
Set the local IP address in the allocated words in the DM Area when using the
CPU Bus Unit System Setup at its default settings (i.e., for simple operation).
The setting is usually made with a Programming Console.
Note 1. If a value other than 00.00.00.00 is set as the local IP address in the CPU
Bus Unit System Setup, even if an IP address is set in the allocated words
in the DM Area, it will be overwritten with the setting in the CPU Bus Unit
System Setup.
2. If no local IP address is set in either the CPU Bus Unit System Setup or the
allocated words in the DM Area (m+98 and m+99), the Ethernet Unit will
not be able to perform communications. Be sure to set the local IP address
in one of these areas. It is not possible, however, to set the following IP ad-
dresses. If any of these values are set, the ERH indicator will flash.
• IP addresses where all network number bits are 0.
• IP addresses where all host number bits are 0.
• IP addresses where all subnet number bits are 0.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
m+98
m+99
(1) (2) (3) (4)
(5) (6) (7) (8)
Application Setting device Setting area Remarks
Operation with the
CPU Unit Bus Sys-
tem Setup set as
desired (i.e., The
default settings are
not used.)
CX-Programmer CPU Unit Bus System Setup The IP address set in the CPU
Unit Bus System Setup is
stored in the allocated words
in the DM Area.
Simple operation
(i.e., The CPU Unit
Bus System Setup is
used at its default
settings. Only the IP
address is set.)
Programming Console (CX-
Programmer can also be
used.)
Allocated words in the DM
Area
The setting in the allocated
words in the DM Area is
enabled only when the IP
address in the CPU Unit Bus
System Setup is set to
00.00.00.00.
If the IP address in the CPU
Unit Bus System Setup is set
to a value other than
00.00.00.00, this value is
stored in the allocated words
in the DM Area.