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DM Area Allocations Section 4-3
4-3 DM Area Allocations
4-3-1 Overview of the Allocated DM Area Words
The various kinds of data are stored in the offset positions shown in the fol-
lowing diagram, from the beginning word in the area for each Unit.
The beginning word m is calculated by the following equation:
Beginning word m = D30000 + (100 x unit number)
4-3-2 Details of the Allocated DM Area Words
IP Address Display/Setting Area (m+98 and m+99)
IP address: (1)(2).(3)(4).(5)(6).(7)(8) (Hex)
If the local IP address is set to a value other than 0.0.0.0 in the TCP/IP Config-
uration, this area (words m+98 and m+99) will act as an IP Address Display
Area and the local IP address set in the TCP/IP Configuration will be read and
stored here when the power is turned ON or the Unit restarted.
If the local IP address in the TCP/IP Configuration is set to 0.0.0.0, this value
is read by the EtherNet/IP Unit when the power is turned ON or the Unit
restarted and is used as the local IP address.
If the local IP address in these words and the TCP/IP Configuration are both
set to 0.0.0.0, the default IP address (192.168.250.Node_address) will be
used. For details on the IP address settings, refer to SECTION 5 Determining
IP Addresses.
Note (1) If an IP address other than 00.00.00.00 is set as the local IP address in
the TCP/IP Configuration, the IP Address Display/Setting Area words
(m+98 and m+99) will be overwritten with the TCP/IP Configuration’s IP
Offset
Bit
Data direction
m
m+97
m+98
m+99
15 08 07 00
(Not used)
IP Address Display/Setting Area
Ethernet Unit to CPU Unit or
CPU Unit to Ethernet Unit
1514131211109876543210
m+98 (1) (2) (3) (4)
m+99 (5) (6) (7) (8)
(1)(2).(3)(4).(5)(6).(7)(8) (Hex)
Application Setting device Setting area Remarks
Simple operation (i.e., The TCP/IP
Configuration is left at its default
settings. Only the IP address is
set.)
Programming Con-
sole (CX-Program-
mer can also be
used.)
Allocated words in
the DM Area
• The setting in the allocated DM Area
words is enabled only when the IP
address is set to 0.0.0.0 in the TCP/IP
Configuration.
• If the IP address is set to a value other
than 00.00.00.00 in the TCP/IP Con-
figuration, this value is stored in the
allocated words in the DM Area.
Operation with the desired IP
address set in the TCP/IP Configu-
ration.
CX-Programmer
(Unit Setup)
Setup TCP/IP Con-
figuration Dialog Box
The IP address set in the Setup TCP/IP
Configuration Dialog Box is stored in
the allocated DM Area words.