Omron Sysmac NJ-series User Manual page 168

7 Tag Data Link Functions
Setting and Downloading Tag Data Link Parameters (Network
Configurator or Sysmac Studio)
The tag data link parameters (e.g., connection information) that are described below are created with
the Network Configurator or the Sysmac Studio, and then the parameters are downloaded to all origina-
tor devices on the EtherNet/IP network. When the tag data links are used on the built-in EtherNet/IP
port, use the Network Configurator to make the following settings.
Additional Information
In the setting of the following tag data link parameter, the specifications of the settable numbers
and the ranges differ depending on the CPU Unit or the version of the CPU Unit. For details,
refer to 1-3-1 Specifications.
1
Creating the Configuration Information
Register the EtherNet/IP ports and EtherNet/IP Units to create the connections that define the
tag data links. Refer to 7-2-3 Registering Devices for details.
2
Setting Tags
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 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 Tag Sets
Create output tag sets and input tag sets and assign tags to them. (You can create up to eight
I/O tag sets.) You can specify the Controller status that indicates the CPU Unit's operating status
(operating information and error information) in a tag set.
4
Setting Connections
Link the output tag sets for the target device and the input tag sets for the originator device as
connections.
 Connection Setting Parameters
The connection settings in step 4 above have the following setting parameters.
Setting the Requested Packet Interval (RPI)
The RPI (Requested Packet Interval) is the I/O data refresh cycle on the Ethernet line when tag data
links are established. With EtherNet/IP, data is exchanged on the communications line at the RPI
that is set for each connection, regardless of the number of nodes.
You can set the RPI for the built-in EtherNet/IP port for each connection in the following ranges.
Setting Multi-cast and Unicast Communications
You can select a multi-cast connection or unicast (point-to-point) connection as the connection type
in the tag data link connection settings. With a multi-cast connection, you can send an output tag set
in one packet to multiple nodes and make allocations to the input tag sets. A unicast connection sep-
arately sends one output tag set to each node, and so it sends the same number of packets as the
number of input tag sets. Therefore, multi-cast connections can decrease the communications load
if one output tag set is sent to multiple nodes. To use a multi-cast connection and send an output tag
set in one packet to multiple nodes, the following settings for the receiving node must be the same
as the settings of the sending node: the connection type (multi-cast), the connection I/O types,
packet internals (RPI), and timeout values.
7-8
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User's Manual (W506)