Omron NX Series User Manual

Item Description
Network Total of Max. Mbit/s The total bandwidth used for tag data link communications in the entire network
is given.
Tag data links will not normally operate if the bandwidth allowed for the network
is exceeded.
l
Checking the Usage of Capacity and Network Bandwidth for Tag Data
Links
The usage rate of allowable tag data link bandwidth for each EtherNet/IP port is given in the Usage
of Capacity (without Multicast Filter) column, and the network bandwidth usage for tag data link
communications is given in the Mbit/s (without Multicast Filter) column.
The usage rate and the network bandwidth usage of tag data link communications for which multi-
cast filtering is not supported by the Ethernet switch are given in parentheses in each correspond-
ing column. These values include bandwidth usage for multicast packets since they are sent to all
the nodes without connection settings.
These values can be adjusted as described in 12-2-4 Changing the RPI on page 12-1
1.
l
Checking the Total Number of Multicast IP Addresses in the Network
When using an Ethernet switch that supports multicast filtering, there must be sufficient multicast
filters for the network. Based on the setting of connections, the Network Configurator indicates the
number of multicast IP addresses to be used in the entire network.
Make sure that the number of multicast IP addresses to be used in the entire network does not ex-
ceed the number of multicast filters supported by the Ethernet switch. If necessary, replace the
Ethernet switch with another one with sufficient multicast filters, or adjust the usage rate and net-
work bandwidth usage with the values given for an Ethernet switch without multicast filtering (i.e.,
the values in parentheses). These values can be adjusted as described in 12-2-4 Changing the RPI
on page 12-11.
l
Checking the Total Maximum Network Bandwidth
The Network Configurator displays the total maximum bandwidth to be used for the entire network.
This value indicates the maximum possible bandwidth for a transmission path which connects
Ethernet switches in cascade. If this value exceeds the bandwidth for each cascade connection in
the actual network (1,000 Mbps), the bandwidth for some transmission paths may be exceeded de-
pending on the network wiring, and the tag data links may not operate normally.
If this occurs, calculate the bandwidth usage of each transmission path and make sure that the
bandwidth for any cascade connection is not exceeded, or adjust the bandwidth to ensure that the
value of Network Total of Max. Mbit/s does not exceed the bandwidth for any cascade connec-
tion. These values can be adjusted as described in 12-2-4 Changing the RPI on page 12-11.
12-2-2
Tag Data Link Bandwidth Usage and RPI
The usage rate of allowable tag data link bandwidth as given in the Usage of Capacity (without
Multicast Filter) column can be adjusted by changing the packet interval (RPI) setting.
If the RPI is set shorter, the Usage of Capacity (without Multicast Filter) will increase.
If the RPI is set longer
, the Usage of Capacity (without Multicast Filter) will decrease.
The RPI can be set in one of the following ways.
• Setting the same PRI for all the connections
12 Communications Performance and Communications Load
12-9
NX-series EtherNet/IP Unit User's Manual (W627)
12-2 Adjusting the Communications Load
12
12-2-2 Tag Data Link Bandwidth Usage and RPI

Omron NX Series Specifications

General

Programming Languages	Ladder, Structured Text, Function Block Diagram, Sequential Function Chart
Communication Ports	Ethernet, USB, RS-232C, RS-485
Memory Capacity	Varies by model
Program Memory	Varies by model
Data Memory	Varies by model
Operating Temperature	0°C to 55°C
Power Supply	24 VDC
Ethernet Ports	1 or 2 ports (depending on model)
USB Ports	1 or 2 ports (depending on model)
Dimensions	Varies by model
Weight	Varies by model