Omron CX-INTEGRATOR - V1.1 Operation Manual page 122

Relay Network Table
The relay network table indicates the network address and node address of the first
relay node when data is being sent to a destination network other than a network to
which the PLC is connected. The destination network is reached by following these
relay nodes.
Relay Network Table
Destination network address
Destination network address:
Relay network address:
Relay node address:
Example: The following example shows the routing tables that route communications
from PLC1 (network address 1, node address 1) to PLC4 (network address 3, node
address 2).
Relay node PLC2
Local node PLC1
Node address 3 (Unit number 0)
Node address 1 Node address 1
(Unit number 0) (Unit number 1)
Network address 1
PLC1 Local Network Table
PLC2 Local Network Table
Local network
Unit number
Unit number
address
0 1
PLC1 Relay Network Table
PLC2 Relay Network Table
Destination Relay Relay
Destination
network network node
network
address address address
address
2 1 3
3 1 3
To go to network address 3, it is
To go to network address 3, first it is
necessary to go to node address 2 in
necessary to go to node address 3 in
network address 2.
network address 1.
Cases when a Relay Network Table Is Required (Local Network Table also Required)
No communications between networks:
Communications required between networks:
Network 1
When routing tables are required, both local network tables and relay network tables
must be set.
Relay network address
Address (1 to 127) of the final destination network
Address (1 to 127) of the network containing the first relay node
in the path to the destination network
Node address of the first relay node in the path to the destination
network
Relay node PLC3
Node address 2
(Unit number 0)
Network address 2
PLC3 LOCAL NETWORK TABle
Local network
Unit number Local
address
address
0 1
0
1 2
1
The local network table shows that it is
necessary to pass through unit number
Relay Relay
1 in the local CPU Rack To go to
network node
network address 3.
address address
PLC3 Relay Network Table
3 2 2
Destination Relay
network network
address address
1
Multi-layer Network
Network 2
3-1 Routing Table Overview
3-1-1 Definition of Routing Tables
Relay node address
Target node PLC4 Node address 2
(Unit number 0)
Node
address 1
(Unit
number 1)
Network address 3 (destination network)
PLC4 Local Network Table
Unit number Local network
network
address
0 3
2
3
PLC4 Relay Network Table
Destination Relay Relay
network network node
address address address
1 3
2 3
Relay
node
address
2 1
Set only local network tables.
Both local network tables and relay network
tables are required.
1
1
3-3