Omron NX Series User Manual

Precautions for Correct Use
When the Unit is performing tag data link communications where the allowable communications
bandwidth per Unit is close to or greater than 30,000 pps, the following functions may not be
used properly. In that case, use the built-in EtherNet/IP port on the CPU Unit or an EtherNet/IP
port of a dif
ferent NX-series EtherNet/IP Unit.
• Connecting the Sysmac Studio online from the EtherNet/IP port of the NX-series EtherNet/IP
Unit
• Connecting the Network Configurator online from the EtherNet/IP port of the NX-series Ether-
Net/IP Unit
• Connecting the NA-series Programmable Terminal online from the EtherNet/IP port of the
NX-series EtherNet/IP Unit
• Port forward via the NX-series EtherNet/IP Unit
• CIP message communications
• SNMP function
These functions of the NX-series EtherNet/IP Unit can be used via X Bus from the built-in
EtherNet/IP port on the CPU Unit or an EtherNet/IP port of a different NX-series EtherNet/IP
Unit.
Example)
Node 1 has an originator connection with the receive RPI of 500 ms, and two target connections with
the send RPIs of 200 ms and 2 ms.
Node 2 has three originator connections with the receive RPIs of 200 ms, 2 ms, and 5 ms.
Node 3 has two target connections with the send RPIs of 5 ms and 1 ms.
O: Originator
T: Target
HB: Heartbeat
O
O
O
O
T T
T
T
RPI: 200 ms
HB: 200 ms
RPI: 2 ms
HB: 100 ms
RPI: 500 ms
HB: 500 ms
RPI: 5 ms
HB: 100 ms
Node 1
Node 2 Node 3
The total PPS of each node is calculated as follows:
• T
otal PPS of the Unit Node 1
= 1,000/200 ms + 1,000/2 ms+ 1,000/500 ms (for data)
+ 1,000/200 ms + 1,000/100 ms + 1,000/500 ms (for heartbeat)
= 524 pps
• Total PPS of the Unit Node 2
= 1,000/200 ms + 1,000/2 ms + 1,000/5 ms (for data)
+ 1,000/200 ms + 1,000/100 ms + 1,000/100 ms (for heartbeat)
= 730 pps
• Total PPS of the Unit Node 3
= 1,000/5 ms + 1,000/500 ms (for data)
+ 1,000/100 ms + 1,000/500 ms (for heartbeat)
= 214 pps
In this example, the total PPS of each Unit is below the maximum bandwidth allowed for the Unit, so
data transmission can be successfully performed.
12 Communications Performance and Communications Load
12-4
NX-series EtherNet/IP Unit User's Manual (W627)

Omron NX Series Specifications

General

Brand	Omron
Model	NX Series
Category	Controller
Language	English