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Overview of Tag Data Links Section 6-1
Note The I/O memory words used in tags in a tag set do not have continuous
addresses. The tags can also be from different I/O memory areas. To enable a
connection, however, each tag set must include only input tags or only output
tags. (Both input and output tags cannot be included in the same tag set.)
Specifications The following table shows the tag and tag set specifications.
PLC Status A characteristic function of the CS1W-EIP21 and CJ1W-EIP21 EtherNet/IP
Units and CJ2 built-in EtherNet/IP ports is the ability to specify the PLC status
as a member of the tag set. This function reads the operating status (operat-
ing and error status) of the CPU Unit of the PLC in which the EtherNet/IP Unit
is mounted, and includes the PLC status as status flags in the data trans-
ferred by the tag data links.
When the PLC status is specified as an output (produce) tag, it is actually
transferred as the tag set’s leading data in the following format.
Tag set SP1_IN
(group of tags a, b, and c)
EtherNet/IP
I/O memory
CPU Unit
a
b
c
d
e
I/O memory
CPU Unit
f
g
h
i
j
Tag set SP1_OUT
Tag set SP2_OUT
(group of tags d, e)
Tag set SP2_IN
Connection
One tag each
(Each tag is set using a text
string of the network symbol
or I/O memory address.)
Tags Tag sets
CS1W-EIP21
CJ1W-EIP21
CJ2H-CPU@@-EIP
CJ2M-CPU3@ CS1W-EIP21
CJ1W-EIP21
CJ2H-CPU@@-EIP
CJ2M-CPU3@
Total size of all tags ≤
184,832 words
Total size of all tags ≤ 640
words
Maximum size of 1 tag set ≤
722 words
(The maximum size is 721
words when the tag set
includes the PLC status.)
Maximum size of 1 tag set ≤
20 words
(The maximum size is 19
words when the tag set
includes the PLC status.)
Maximum size of 1 tag ≤ 722
words
(The maximum size is 721
words when the tag set
includes the PLC status.)
Maximum size of 1 tag ≤ 20
words
(The maximum size is 19
words when the tag set
includes the PLC status.)
Number of tags per tag set ≤ 8
(7 tags/tag set when the tag set includes the PLC status)
Note Input and output variables cannot be combined.
Number of registrable tags ≤
256
Number of registrable tags ≤
32
Number of registrable tag
sets ≤ 256
Number of registrable tag
sets ≤ 32
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
00 0 0 0 0 0 0 0 0 0 0 0 0
PLC Operating Flag
PLC Error Flag