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8 EtherNet/IP Communications
NX-series EtherNet/IP Coupler Unit User’s Manual (W536)
8-2 Tag Data Links
8
8-2-1 Tag Data Link Data Areas
Tag data links are automatically started when the data link parameters are downloaded from the Net-
work Configurator. Thereafter, tag data links can be stopped and started for the entire network or indi-
vidual devices from the Network Configurator. Starting and stopping tag data links for individual devices
must be performed for the originator. Refer to 9-5-10 Starting and Stopping Tag Data Links on page
9-69 for details.
A tag is a data link between the local I/O memory and a remote I/O memory. A tag can be set using a
network variable or an I/O memory address.
Each tag set represents the data that is linked for a tag data link connection. Tag data links are there-
fore created through a connection between one tag set and another tag set. A tag set name must be set
for each tag set. Data exchange for the tags are exchanged in the order that the tags are registered in
the tag sets. Register the tags in the same order in the input and output tag sets.
Note A connection is used to exchange data as a unit within which data concurrency is maintained. Thus, data
concurrency is maintained for all the data exchanged for the tags in one data set.
Precautions for Correct Use
Data exchange for the tags are exchanged with the EtherNet/IP Slave Terminal in the order that
the tags are registered in the tag sets in the EtherNet/IP master. Therefore, register the input
tag sets in the EtherNet/IP master and the output tag sets in the EtherNet/IP Slave Terminal
with the same sizes and in the same order, and register the output tag sets in the EtherNet/IP
master and the input tag sets in the EtherNet/IP Slave Terminal with the same sizes and in the
same order.
Starting and Stopping Tag Data Links
8-2-1 Tag Data Link Data Areas
Tags
Tag Sets
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