Omron CJ1W-EIP21 Operation Manuals page 139

Additional Information
Counting Connections
The number of connections is the total of the number of input tag sets that receive data and the
number of nodes that send data for output tag sets. (Refer to the following figure.) One connec-
tion is consumed for each connection setting whether the connection is a multi-cast connection
or a unicast (point-to-point) connection.
Example of Calculating the Number of Connections
Example for EtherNet/IP Unit with IP address of 192.168.250.254 in bidirectional
connection with 128 nodes
192.168.250.254
Tagset_in1
Tagset_in2
Tagset_in128
Tagset_out254
The maximum number of
connections for node
192.168.250.254 is 256.
An EtherNet/IP Unit must be mounted to the Controller to increase the maximum number of con-
nections. (Refer to the following figure.)
Example of Calculating the Number of Connections
The maximum number of connections (32) per port would be exceeded if a built-in
EtherNet/IP port with an IP address of 192.168.250.254 is used in a bidirectional
connection with 17 nodes.
In this case, bidirectional communications can be performed with 17 nodes or more by
adding an EtherNet/IP Unit with the IP address of, for example, 192.168.250.253 to
the same Controller, creating an output tag set in the new EtherNet/IP Unit, and
creating connections.
192.168.250.254
Tagset_in1
Tagset_in2
Tagset_in17
192.168.250.253
Tagset_out33
Version Information
You can use the CJ1W-EIP21 EtherNet/IP Unit mounted to an NJ-series Controller with a CPU
Unit with unit version 1.01 or later and Sysmac Studio version 1.02 or higher.
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
192.168.250.1
CN.1
Tagset_out
Tagset_in
CN.2 CN.129
192.168.250.2
Tagset_out
CN.128
CN.130
Tagset_in
192.168.250.128
Tagset_out
CN.256
Tagset_in
192.168.250.1
CN.1
Tagset_out
Tagset_in
CN.2 CN.1
192.168.250.2
Tagset_out
CN.17
CN.2
Tagset_in
192.168.250.17
Tagset_out
CN.34
Tagset_in
7 Tag Data Link Functions
7
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