236
Conditions Requiring Routing Tables Section 6-7
The CX-Net in the CX-Programmer is used to set the relationship between the
serial port’s unit address and the allocated network address in the local net-
work tables of the routing tables. These settings are then transferred to the
CPU Unit to which the Serial Communications Unit/Board is mounted.
• Serial Port 1 Unit Addresses
• Serial Port 2 Unit Addresses
These settings enable the serial communications path to be treated as a sin-
gle FINS network. Further, the network address allocated to the serial port
can be specified in the destination network address part of the FINS mes-
sage. This enables messages to passed on to serial ports in a system com-
prised of multiple networks connected to a single PLC (including the serial
communications path).
Reasons for Routing Tables
CompoWay/F, Modbus-RTU, Modbus-ASCII Protocol Conversion
Routing tables are not required to enable serial communications paths to be
treated as networks. (The serial port can be specified in the node without
using routing tables by specifying the node to which the Board/Unit is con-
nected, and specifying the unit address as that of the serial port.)
Unit number0123456789ABCDEF
Hexadecimal 8084888C9094 989CA0A4A8ACB0B4B8BC
Decimal 128 132 136 140 144 148 152 156 160 164 168 172 176 180 184 188
Unit number0123456789ABCDEF
Hexadecimal 8185898D9195 999DA1A5A9ADB1B5B9BD
Decimal 129 133 137 141 145 149 153 157 161 165 169 173 177 181 185 189
PLC
Network address n
Serial communications path
Serial Communications Unit/Board
Local network table in routing tables
U
n
Unit number
CX-Net in CX-
Programmer
Local
network
table
Unit address U (80 hex/81 hex
+ unit number × 4 hex)
Network
address
Set the unit address
U as a decimal for
the unit number.
FINS message
Serial Communications Unit/Board
CPU Unit
Serial communications path
Local
network
table
Routing
enabled
Specify on which path
to send the message.
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