Omron Sysmac NX1P2-10 1 Series, User Manual

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O
T T
O
T
O
T
O
T: Target
O: Originator
Node 3 Node 2
Node 1
If multicast is specified for data transmission and the node sends out just one multicast packet to other
nodes, it requires respective connections for them.
Example)
Node 3 sends out one multicast packet to Node 1 and Node 2. Node 3 has one target connection with
Node 1, and one target connection with Node 2, requiring two connections in total.
You need to keep in mind that the number of required connections is the same, whether multicast or
unitcast is specified for the communications.
T
O
T
O
T: Target
O: Originator
Multicast
Node 3
Multicast
Node 2
Node 1
15-1-3
Packet Interval (RPI) Accuracy
A send processing delay occurs in a built-in EtherNet/IP port when data packets are sent based on a
packet interval (RPI).
This delay varies within the RPI error margin as shown below, so the send processing may be delayed
for the maximum value for each RPI.
Packet interval (RPI) RPI error margin (±) (%)
0.5 to 1,000 ms (NX701 CPU Unit)
1 to 1,000 ms (NX102 CPU Unit)
2 to 1,000 ms (NX1P2 CPU Unit)
1 to 1,000 ms (NJ-series CPU Unit)
*1
15 − (RPI [ms]/100)
1,000 to 10,000 ms 5% of the RPI
*1. Note that the RPI for a NJ-series CPU Unit with unit version 1.00 to 1.02 is between 10 ms to 1,000 ms.
15 Communications Performance and Communications Load
15-5
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
15-1
Communications System
15
15-1-3 Packet Interval (RPI) Accuracy