Precautions for Correct Use
• If a variable with an AT specification is used as a tag, you do not need to set a refreshing
task.
It is refreshed in the primary periodic task.
• Y
ou cannot use the following notation, which specifies an I/O memory address, in the variable
name of any variable used in a tag data link.
a) Variable names that contain only single-byte numerals (Example: 001)
b) Variable names with the following single-byte letters (uppercase or lowercase) followed by
single-byte numerals
1) H (Example: H30)
2) W (Example: w30)
3) D (Example: D100)
4) E0_ to E18_
• When the server function of CIP message communications is disabled, the tag data links can-
not be used. Enable the server function of CIP message communications. Refer to CIP Mes-
sage Server on page 7-15 for details on setting CIP message server.
• NX-series EtherNet/IP Unit performs I/O refreshing in synchronization with the task of the
CPU Unit. If the event I/O Refreshing Timeout Error (65900000 hex) occurs, it means that the
processing load in the NX-series EtherNet/IP Unit is high and I/O refreshing synchronized
with the task cycle cannot be executed. In that case, take measures such as setting tasks in
which to perform I/O refreshing for tag sets to use exclusive control of variables in tasks. Re-
fer to I/O Refreshing of X Bus Function Module in the NJ/NX-series CPU Unit Software
User’s Manual (Cat. No. W501) for details on the settings. For more information about the
event I/O Refreshing Timeout Error (65900000 hex), refer to the NJ/NX-series
Troubleshooting Manual (Cat. No. W503).
Setting and Downloading Tag Data Link Parameters (Network Con-
figurator or Sysmac Studio)
The following tag data link parameters (e.g., connection information) are created with the Network
Configurator or the Sysmac Studio, and then the parameters are downloaded to all originator devices
on the EtherNet/IP network.
When the tag data links are used on EtherNet/IP ports, use the Network Configurator to make the fol-
lowing settings.
1 Creating the Configuration Information
Register EtherNet/IP ports and EtherNet/IP Units to create connections that define the tag data
links. For details, refer to 9-2-3 Registering Devices on page 9-17.
2 Setting T
ags
Create CPU Unit variables for input (consume) tags and output (produce) tags.
You can import and export network variables that are created on the Sysmac Studio to CSV
files. This allows you to register them as tags on the Network Configurator.
Output (produce) tags can be defined to clear output data to 0 or to hold the output data from
before the error when a fatal error occurs in the CPU Unit.
3 Setting T
ag Sets
Create output tag sets and input tag sets and assign tags to them. (You can create up to eight
I/O tag sets.) Y
ou can specify the Controller status that indicates the CPU Unit's operating sta-
tus (operating information and error information) in a tag set.
9 Tag Data Link Functions
9-8
NX-series EtherNet/IP Unit User's Manual (W627)
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