7 Tag Data Link Functions
7-8
NY-series Industrial Panel PC / Industrial Box PC Built-in EtherNet/IP Port User’s Manual (W563)
Create Controller 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
Controller.
3
Setting Tag Sets
Create output tag sets and input tag sets and assign tags to them. You can specify the Control-
ler status that indicates the Controller’s operating status (operating information and error infor-
mation) 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.
With the built-in EtherNet/IP port, you can set RPI for each connection.
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
separately 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 out-
put 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.
Precautions for Correct Use
Precautions for Correct Use
•
The performance of communications devices is limited to some extent by the limitations of
each product’s specifications. Consequently, there are limits to the packet interval (RPI) set-
tings. Refer to
13-2 Adjusting the Communications Load
and set an appropriate packet inter-
val (RPI).
•
If multi-cast connections are used, however, use an Ethernet switch that has multi-cast filter-
ing, unless the tag set is received by all nodes in the network. If an Ethernet switch without
multi-cast filtering is used, the multi-cast packets are broadcast to the entire network, and so
packets are sent to nodes that do not require them, which will cause the communications load
on those nodes to increase.
•
If you will use data tag links with multicast at a communication speed over 100 Mbps, use an
Ethernet switch that supports a communication speed of 1000 Mbps.
If there is an Ethernet device on the same network that communicates at a speed of 100
Mbit/sec or less, the device may affect tag data link communication and cause tag data links to
be broken, even if the device is not related to tag data link communication.
Summary of Contents for Sysmac NY512-1300
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