Changing The Rpi - Omron NJ Series User Manual

Ethernet Switches with Multicast Filtering
• Is the Mbit/s value for each node below the maximum network bandwidth?
If any node exceeds the maximum network bandwidth, change the connection settings, such as the
RPI.
• Is the Usage of Capacity value for each node below 100%?
If any node exceeds the maximum network bandwidth, change the connection settings, such as the
RPI.
• Is the Network Total of Max. Mbit/s value below the maximum network bandwidth?
If the value exceeds the maximum network bandwidth, the bandwidth for some transmission paths
(e.g., an Ethernet switch or media converter) may be exceeded due to the network wiring (e.g., cas-
cade connection of Ethernet switches), and the tag data links may not operate normally. Check if the
bandwidth of the transmission path in each cascade connection is not exceeded. If the bandwidth is
exceeded, rewire the network or increase the bandwidth between Ethernet switches (e.g., to 1
Gbps). If these countermeasures are not possible, change the connection settings such as the RPI
settings, and adjust the bandwidth to ensure that the value of Network Total of Max. Mbit/s does
not exceed the bandwidth for any cascade connection.
• Is the Mbit/s (without Multicast Filter) value for each node below the maximum network band-
width? Or, is the value of Usage of Capacity (without Multicast Filter) for each node below
100%?
If any node exceeds either of them, check whether the multicast filtering on the relevant Ethernet
switch is functioning correctly. If the number of multicast filters on the Ethernet switch is less than
the number of Total usage of IP multicast addresses, the bandwidth for some transmission paths
may be exceeded depending on the network wiring (e.g., cascade connection of Ethernet switches),
and the tag data links may not operate normally. Calculate the number of multicast filters required
for each Ethernet switch on the network, and check if the resulting number is below the number of
multicast filters provided by the Ethernet switch. If the Ethernet switch does not have a sufficient
number of multicast filters, replace it with another one which has sufficient multicast filters, or
change the connection settings, such as the RPI settings.
15-2-4

Changing the RPI

You can check Usage of Capacity (without Multicast Filter) values offline for the usage rate of al-
lowable tag data link bandwidth if you follow the procedure provided in 15-2-1 Checking Bandwidth
Usage for Tag Data Links on page 15-8.
You can adjust Usage of Capacity (without Multicast Filter) values by changing packet interval
(RPI) values.
If required communications performance cannot be achieved after the adjustment, re-evaluate the net-
work configuration.
1
Make required settings in the Network Configuration Window on the Network Configurator.
2
Click the Detail Button in the Usage of Device Bandwidth Area at the bottom of the Network
Configuration Window.
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User's Manual (W506)
15 Communications Performance and Communications Load
15
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