Omron SYSMAC CJ1W-EIP21, Operation Manuals

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7 Tag Data Link Functions
7-2
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
7-1 Introduction to Tag Data Links
Tag data links enable cyclic tag data exchanges on an EtherNet/IP network between Controllers or
between Controllers and other devices. Variables are assigned to tags. (You can also assign I/O mem-
ory addresses to tags.) The settings for tag data links are made with the Network Configurator. Refer to
7-2 Setting Tag Data Links for information on how to make the settings.
With a tag data link, one node requests the connection of a communications line to exchange data with
another node. The node that requests the connection is called the originator, and the node that receives
the request is called the target.
For communications between Controllers, the connection information is set in the EtherNet/IP Unit of
the Controller that receives (consumes) the data (i.e., the originator).
Additional Information
For communications between a Controller and an I/O device, the connection information is set in
the EtherNet/IP Unit that is the originator. If an I/O device is used, the Network Configurator must
have an EDS file installed that includes connection information for the I/O device. Refer to A-2
EDS File Management for the installation procedure.
The output words and input words for each node for which data is exchanged are set in the connection
information. These words are called the output tag set and input tag set. A tag set must specify at least
one tag. The size of the data for data exchange is the total size of the tags included in the tag set. The
size of the output tag set and the size of the input tag set must match.
7-1-1 Tag Data Links
EtherNet/IP Unit
NJ-series CPU Unit
Outputs
Tag set name: OUT1
EtherNet/IP EtherNet/IP
NJ-series CPU Unit (Built-in EtherNet/IP port)
Var_In_a
Var_In_c
Var_In_b
Var_Out_d
Var_Out_f
Var_Out_e
Var_In_d
Var_In_f
Var_In_e
• Var_Out_d
• Var_Out_e
• Var_Out_f
• Var-Out1
• Var-Out2
• Var-Out3 • Var_In_a
• Var_In_b
• Var_In_c
• Var_In_d
• Var_In_e
• Var_In_f
Var-Out1
Var-Out2
Var-Out3
I/O refreshed. I/O refreshed.
I/O refreshed. I/O refreshed.
Connection
Controller status Controller status
I/O refreshed. I/O refreshed.
Input
Input
Output
Tag set name: ABC
Tag set name: XYZ
Tag set name: IN1
Output tags
Output tags
Input tags
Input tags
Connection
Originator
Target
Target
Originator
I/O refreshed. I/O refreshed.