7-9
7 Tag Data Link Functions
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
7-1 Introduction to Tag Data Links
7
7-1-4 Overview of Operation
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.
An EtherNet/IP Unit must be mounted to the Controller to increase the maximum number of con-
nections. (Refer to the following figure.)
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.
Example for EtherNet/IP Unit with IP address of 192.168.250.254 in bidirectional
connection with 128 nodes
Example of Calculating the Number of Connections
The maximum number of
connections for node
192.168.250.254 is 256.
192.168.250.254
Tagset_in1
Tagset_in2
Tagset_in128
Tagset_out254
CN.1
CN.2
CN.128
CN.129
CN.130
CN.256
192.168.250.1
Tagset_out
Tagset_in
192.168.250.2
Tagset_out
Tagset_in
192.168.250.128
Tagset_out
Tagset_in
192.168.250.254
Tagset_in1
Tagset_in2
Tagset_in17
Tagset_out33
192.168.250.1
Tagset_out
Tagset_in
192.168.250.2
Tagset_out
Tagset_in
192.168.250.17
Tagset_out
Tagset_in
CN.1
CN.2
CN.17
CN.1
CN.2
CN.34
192.168.250.253
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.
Example of Calculating the Number of Connections
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