Omron Sysmac NX1P2-10 1 Series, User Manual

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15-2 Adjusting the Communications Load
In an Ethernet network using an Ethernet switch, the network bandwidth is not shared by all of the no-
des; independent transmission paths are established between individual nodes through the Ethernet
switch.
A dedicated communications buffer is established in the Ethernet switch for communications between
the nodes, and full-duplex communications (simultaneous transmission and reception) are performed
asynchronously with other transmission paths. The communications load in other transmission paths
does not affect communications, so packet collisions do not occur and stable, high-speed communica-
tions can be performed.
The Ethernet switch functions shown in the following table determine the performance of tag data
links.
Item Description
Buffer capacity This is the amount of data that can be buffered when packets ac-
cumulate at the Ethernet switch.
Multicast filtering This function transfers multicast packets to specific nodes only.
QoS function This function performs priority control on packet transfers.
The following table shows the setting ranges of the tag data link settings that can be made for a built-
in EtherNet/IP port.
Item Description
NX-series CPU Unit NJ-series CPU Unit
NX701 NX102 NX1P2
Unit ver-
sion 1.00 to
1.02
Unit ver-
sion 1.03 or
later
Network bandwidth Physical Ether-
net baud rate 1,000 Mbps 100 Mbps or 10 Mbps
Allowed tag data
link communica-
tions bandwidth Maximum num-
ber of tag data
link packets that
can be process-
ed in 1 second
(pps: packets
per second) 40,000 pps
max. (total
of
40,000pps
with two
ports) 12,000pps
max. (total
of
12,000pps
with two
ports) 3,000 pps
max. 1,000 pps
max. 3,000 pps
max.
Connection resour-
ces Number of con-
nections that
can be estab-
lished 256 max.
(total of 512
with two
ports) 32 max. (to-
tal of 64
with two
ports) 32 max.
Packet interval
(RPI: Requested
Packet Interval) Refresh period
for tag data 0.5 to
10,000 ms
in 0.5-ms in-
crements 1 to 10,000
ms in 1-ms
increments 2 to 10,000
ms in 1-ms
increments 10 to
10,000 ms
in 1-ms in-
crements 1 to 10,000
ms in 1-ms
increments
When the tag data link settings exceed the capabilities of the Ethernet switch to be used, increase the
packet interval (RPI) value for adjustment.
Particularly when you configure the settings with an Ethernet switch that does not support multicast
filtering, you need to consider that multicast packets will be sent to all the nodes on the network with-
out setting the connections.
15 Communications Performance and Communications Load
15-7
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
15-2
Adjusting the Communications Load
15
15-2-1 Checking Bandwidth Usage for T
ag Data Links