7-3
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
7-1-2 Data Link Data Areas
A tag is a unit that is used to exchange data with tag data links. Data is exchanged between the local
network variables and remote network variables specified in the tags or between specified I/O memory
areas.
Precautions for Correct UsePrecautions for Correct Use
To maintain concurrency in the values of network variables that are assigned to tags, you must
set refreshing tasks. Refer to 7-1-7 Concurrency of Tag Data Link Data for details.
When a connection is established, from 1 to 8 tags (including Controller status) is configured as a tag
set. Each tag set represents the data that is linked for a tag data link connection. Tag data links are
therefore created through a connection between one tag set and another tag set. A tag set name must
be set for each tag set.
Data for the tags is 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 UsePrecautions for Correct Use
Data for the tags is 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.
7-1-2 Data Link Data Areas
Tags
Tag Sets
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