Mitsubishi FX3U-ENET, User Manual

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MELSEC-F
5 COMMUNICATION PROCEDURE
(2) Subnet mask pattern (BFM#512, 513)
(a) Set the subnet mask.
1
(Setting range: C0000000
H
to FFFFFFF)
Consult the network administrator for the setting.
(b) 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 Ethernet networks include small-scaled network systems where multiple
devices are connected to one Ethernet hub along with 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
FF
H
00
H
FF
H
FC
H
1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 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
(Example) Class B
81
H
05
H
2F
H
01
H
IP address
Subnet mask
IP address
Network address
Subnet address Host address
POINT
(1) All devices on the same sub-network must have a common subnet mask.
(2) When not administrated by the sub-network, the connected devices need not
have a subnet mask. (Set the network address of the corresponding class.)