Precautions - Mitsubishi Electric Q03UDVCPU User Manual

4.2

Precautions

(1) Connection to LAN line
When connecting the CPU module to a LAN line, do not set direct connection. Doing so will apply a load to the
LAN line and adversely affect communications with other external devices.
(2) Indirect connection
• Do not set up direct connection when a CPU module is connected to an external device in a one-to-one
basis using a hub as shown below.
• When two or more Ethernet ports are enabled 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 other Ethernet ports.
(3) Conditions that disallow direct connection
When any of the following conditions is met, communication by direct connection may not be available. In that
case, check the setting of the CPU module and/or personal computer.
• In the CPU module IP address bits, the bits corresponding to "0" in the personal computer subnet mask are
all ON or all OFF.
Ex. CPU module IP address
Personal computer IP address
Personal computer subnet mask
• In the CPU module IP address bits, the bits corresponding to the host address of the class in the personal
computer IP address are all ON or all OFF.
Ex. CPU module IP address
Personal computer IP address
Personal computer subnet mask
Remark
● The IP address pattern for each class is as follows.
Class A: 0.x.x.x to 127.x.x.x
● The host address for each class is the part shown with "0".
Class A: 255. 0. 0. 0
50
CPU module
Hub
Ethernet cable
Class B: 128.x.x.x to 191.x.x.x
Class B: 255.255. 0. 0
Programming tool
: 64. 64.
: 64. 64.
: 255. 255.
: 64. 64.
: 192. 168.
: 255. 0.
Class C: 192.x.x.x to 223.x.x.x
Class C: 255.255.255. 0
255. 255
1. 1
0. 0
255. 255
0. 1
0. 0