Mitsubishi Q01CPU User Manual

12
TROUBLESHOOTING
12.2 Troubleshooting
12.2.29 When Ethernet communication with CPU module is slow or unstable
12 - 47
9
EMC AND LOW VOLTAGE DIRECTIVES
10
LOADING AND INSTALLATION
11
MAINTENANCE AND INSPECTION
12
TROUBLESHOOTING APPENDICES INDEX
Completed
(From previous page)
NO
YES
NO
YES
NO
YES
NO
YES
YES
NO
YES
NO
YES
NO
YES
NO
Is Ethernet communication load on
QnUDE(H)CPU too high?
Is any interrupt program used?
Check the communications referring to the following.
NO YES
NO
YES
Has the hub
or router discarded messages
because of its too-small packet buffer
capacity? (Consult your network
administrator.)
Use a hub or router that has a large packet buffer
capacity.
Consult your network administrator and check the hub
and router.
Consult your network administrator and check the
network condition.
Take actions against noise to reduce communication
errors. *
3
Check the traffic, and if a high traffic is a cause of the
problem, take actions for it.
Is communication of
a device other than QnUDE(H)CPU
unstable? (Consult your network
administrator.)
Have many
unnecessary broadcast data
been received? (See Connection
status in Ethernet
diagnosis.)
Unnecessary broadcast data have been highly loaded.
Increase service process time for QnUDE(H)CPU.
Reduce the Ethernet communication load on QnUDE(H)CPU.
Increase the service time of QnUDE(H)CPU.
Reduce the number of connected devices.
Reduce the connection setting value.
Reduce the communication frequency per connection
and data volume.
Consult your network administrator, and check the network condition.
Identify a broadcasting device, and restrict the broadcast data volume.
(Devices such as computers or routers may broadcast data.)
Use filtering of broadcast data with a router to prevent QnUDE(H)CPU from
receiving them.
Separate the network where frequent broadcasts occur from the network
containing QnUDE(H)CPU.
Reduce the frequency and process time of the interrupt
program.
Is Ethernet
communication stabilized?
Is Ethernet
communication stabilized?
Is Ethernet
communication stabilized?
Is Ethernet
communication stabilized?
Is Ethernet
communication stabilized?
When Ethernet communication with the target device is not available
Section 12.2.27

Mitsubishi Q01CPU Specifications

General

Brand	Mitsubishi
Model	Q01CPU
Category	Controller
Language	English