Mitsubishi Electric Q12DCCPU-V User Manual page 263

6
PREPARATORY PROCEDURES AND SETTING
(6) Precautions
(a) Precautions for using two Ethernet channels (ports) (Q12DCCPU-V only)
<Example where communications are not available>
When using two channels as Ethernet ports, two different network addresses
must be set for CH1 and CH2 of the C Controller module.
In the above case, a response to the message received through each channel is
sent as follows.
• Messages (including response packets such as ping) to the device having the
same network address as CH1 are sent from CH1.
• Messages (including response packets such as ping) to the device having the
same network address as CH2 are sent from CH2.
ping request and
ping response
Personal computer
[192.168.3.10]
IP address
Subnet mask
[255.255.255.0]
Figure 6.40 Example of ping execution from a personal computer (communication via CH1)
Normal communications are not available with a personal computer of a different
network address through an Ethernet port if the configuration is as shown below.
Personal computer
IP address [192.168.3.10]
Subnet mask
[255.255.255.0]
1) ping request
* 1 A personal computer with the same network address is not connected to the Ethernet port.
* 2 A personal computer connected to the Ethernet port has a different network address.
Figure 6.41 Example of ping execution from a personal computer (communication not available)
Ethernet
C Controller module, CH1
IP address
Subnet mask
C Controller module, CH2
IP address
Subnet mask
2) A ping response
cannot be sent.
C Controller module, CH1
IP address
Subnet mask
C Controller module, CH2
IP address
Subnet mask
Ethernet
6.6 Network Settings for 1:1 Connection
1
2
3
[192.168.3.3]
[255.255.255.0]
4
[192.168.4.3]
[255.255.255.0]
5
*1
[192.168.3.3]
[255.255.255.0]
6
*2
[192.168.4.3]
[255.255.255.0]
7
8
6
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