Mitsubishi Electric Q Series Programming Manual page 180

4 AUXILIARY AND APPLIED FUNCTIONS
(2) Precautions
Precautions for direct connection are shown below.
(a) Connection to LAN line
When the Motion CPU is connected to LAN line, do not perform
communication using direct connection. If performed, the communication
may put a load to LAN line and adversely affect communications of other
devices.
(b) Connection not connected directly
• The system configuration that connects a Motion CPU with an external
device using a hub as shown below is not regarded as direct connection.
• When two or more Ethernet ports are enables in the network connections
setting on the personal computer, communication by direct connection is
not possible. In the setting, leave only one Ethernet port enabled for direct
connection and disable the other Ethernet ports.
(c) Condition in which direct connection communication may not be available
Under the following conditions, direct connection communication may not be
available. In that case, check the setting of the Motion CPU and/or personal
computer.
• In the Motion CPU IP address, bits corresponding to "0" in the personal
computer subnet mask are all ON or all OFF.
(Example) Motion CPU IP address
• In the Motion CPU IP address, bits corresponding to the host address for
each class in the personal computer IP address are all ON or all OFF.
(Example) Motion CPU IP address
Personal computer IP address
Personal computer subnet mask : 255.255.
Personal computer IP address
Personal computer subnet mask : 255.
4 - 65
HUB
: 64. 64. 255. 255
: 64. 64. 1.
0.
: 64. 64. 255. 255
: 192.168. 0.
0. 0.
1
0
1
0