Mitsubishi Electric MELSEC Q Series User Manual page 132

(b) Precautions for IP address setting
The network portion of the IP address must be the same in both the destination device to connect and the user
Ethernet port or Built-in Ethernet port.
CH1 and CH2 of user Ethernet port and built-in Ethernet port must have different network portions in their IP
addresses.
A message to the destination device (including response packet such as ping) is sent (as a response) from the
user Ethernet port or Built-in Ethernet port that has the same network portion in the IP address.
• Example of ping execution from a personal computer
Ethernet
ping request and
ping response
Personal computer
IP address [192.168.3.10]
Subnet mask [255.255.255.0]
As illustrated below, no message (including response packet such as ping) is not transmitted (as a response) to
the destination device if you connect a user Ethernet port and a destination device with different network
portion in their IP addresses.
• Communication not available
Personal computer
[192.168.3.10]
IP address
Subnet mask [255.255.255.0]
1) ping request
Ethernet
130
C Controller module, CH1
C Controller module, CH2
IP address
Subnet mask
2) A ping response
cannot be sent.
For "-LS", consult with the
partner (operating system vendor).
IP address
[192.168.3.3]
Subnet mask
[255.255.255.0]
[192.168.4.3]
[255.255.255.0]
C Controller module, CH1
IP address
[192.168.3.3]
Subnet mask
[255.255.255.0]
C Controller module, CH2
IP address [192.168.4.3]
Subnet mask
[255.255.255.0]
1.
Transmit ping request from
Personal computer to the C
Controller module.
2.
A ping response is transmitted
(as a response) from the user
Ethernet port CH1 with the
same network portion
(192.168.3) as the destination
device.
3.
Transmit ping request from
Personal computer to the C
Controller module.
4.
A ping response is transmitted
(as a response) from the user
Ethernet port CH1 with the
same network portion
(192.168.3) as the destination
device. (No transmission from
CH2 that received the ping
request.)
CH1 is not connected to the
destination device, so no ping
response is returned.