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Overview of Tag Data Links Section 6-1
6-1-2 Overview of Operation
Setting and Downloading Tag Data Link Parameters
The tag data link parameters (e.g., connection information) that are described
below are created using the Network Configurator, and then the parameters
are downloaded to all originator devices on the EtherNet/IP network.
Make the following settings using the Network Configurator if tag data link
functionality is used with the CJ2B-EIP21 built-in EtherNet/IP port on the
CJ2H, CJ2M-EIP21 built-in EtherNet/IP port on the CJ2M, CS1W-EIP21, or
CJ1W-EIP21.
Tag Settings Create input (reception) tags and output (send) tags for addresses in the CPU
Unit's I/O memory areas or for symbols.
The following are the limits for tags that can be created with the CJ2B-EIP21
built-in EtherNet/IP port on the CJ2H, CJ2M-EIP21 built-in EtherNet/IP port
on the CJ2M, CS1W-EIP21, or CJ1W-EIP21.
• A maximum of 32 tags can be created per Unit for the CJ2M-EIP21. A
maximum of 256 tags can be created per Unit for other CPU Units.
• A maximum data size of 40 bytes (20 words) can be used per tag for the
CJ2M-EIP21. A maximum data size of 1,444 bytes (722 words) can be
used per tag for other CPU Units.
With the CJ2H-CPU6@-EIP or CJ2M-CPU3@, you can create tags by import-
ing network symbols (i.e., I/O allocation settings) that were created using the
CX-Programmer into the Network Configurator. Output tags can be defined to
clear output data to 0 or to hold the output data when PLC outputs are turned
OFF.
Setting Tag Sets Create output tag sets and input tag sets and position them. (Up to eight tag
sets can be created). The following are the limits on tag sets that can be cre-
ated with the CJ2B-EIP21 built-in EtherNet/IP port on the CJ2H, CJ2M-EIP21
built-in EtherNet/IP port on the CJ2M, CS1W-EIP21, or CJ1W-EIP21.
• A maximum of 32 tag sets can be created per Unit for the CJ2M-EIP21. A
maximum of 256 tag sets can be created per Unit for other CPU Units.
• A maximum data size of 40 bytes (20 words) can be used per tag set for
the CJ2M-EIP21. A maximum data size of 1,444 bytes (722 words) can
be used per tag set for other CPU Units.
The PLC status can be specified in a tag set to indicate the CPU Unit’s operat-
ing status (operating information and error information).
Setting Connections The target device output tag set and the originator device input tag set are
associated as connections. A maximum of 256 connections can be opened
per Unit for the CJ2B-EIP21 built-in EtherNet/IP port on the CJ2H, CS1W-
EIP21, or CJ1W-EIP21. A maximum of 32 connections can be opened per
Unit for the CJ2M-EIP21 built-in EtherNet/IP port on the CJ2M.
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 connection is consumed for each connec-
tion setting whether the connection is a multicast connection or a unicast
(point-to-point) connection.