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MELSEC-Q
7 PARAMETER SETTING
(3) Routing information
(a) Router relay function
1) Set whether the router relay function will be used or not.
The router relay function is not needed when the QJ71MT91
communicates with the target device on the same Ethernet (the subnet
address of the IP address is the same).
2) The router relay function allows communication with devices on other
Ethernets via routers and gateways.
(The router relay function does not mean a function with which the
QJ71MT91 acts as a router.)
3) One default router and a maximum of any eight routers can be set for
the router relay function.
(b) Subnet mask pattern
1) Set the subnet mask. *1 (Setting range: C0000000
H
to FFFFFFFC
H
)
Consult the network administrator for the setting.
2) When not using the subnet mask, set any of the following table values
according to the class.
Class Mask
value
Class A
FF000000
H
Class B
FFFF0000
H
Class C
FFFFFF00
H
*1 Networks constructed by Ethernet include small-scaled network systems
where multiple devices are connected to one Ethernet, and medium- and
large-scaled network systems where multiple small-scaled networks are
connected by routers, etc.
The subnet mask logically divides one network, where many devices are
connected, into multiple sub-networks to facilitate administration.
1 0 0 0 0 0 0 1
81
H
0 0 0 0 0 1 0 1
05
H
0 0 1 0 1 1 1 1
2F
H
0 0 0 0 0 0 0 1
01
H
1 1 1 1 1 1 1 1
FF
H
0 0 0 0 0 0 0 0
00
H
1 1 1 1 1 1 1 1
FF
H
1 1 1 1 1 1
FC
H
0
0
0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 1 0 0 0 0 0 1 0 1 0 0 1 0 1 1 1 1
81
H
05
H
2F
H
01
H
(Example) Class B
IP address
Subnet mask
IP address
Network address
Subnet address
Host address
POINT
(1) All devices on the same sub-network must have common subnet masks.
(2) When not administrated by the sub-network, the connected devices need not
have subnet masks. (Set the network address of the corresponding class.)
