The size of data for data exchange is the total size of tags included in the tag set. The size of the out-
put tag set and the size of the input tag set must match.
7-1-2
Data Link Data Areas
Tags
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 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 T
ag Data Link Data on page 7-12 for details.
Tag Sets
When a data link connection is established, one or more tags (up to eight tags including Controller sta-
tus) are configured as a collective set of tags for the connection. This is called a tag set. Each tag set
represents a unit of data for one tag data link connection.
T
ag 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.
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 one or more tags in one tag set.
Precautions for Correct Use
Data with tags is exchanged in the order that the tags are registered in the tag set. Register the
tags in the same order of the input and output tag sets.
Example
In the following example, input tags "a" to "g" at the originator are a tag set named SP1_IN and
output tags "I" and "ii" are a tag set named SP1_OUT. A connection is set between these two tag
sets.
7 Tag Data Link Functions
7-3
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
7-1 Introduction to Tag Data Links
7
7-1-2 Data Link Data Areas
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