Mitsubishi Electric MELSEC iQ-R Series User Manual page 135

When communications cannot be performed by using the service interface function
The following lists the actions to be taken if communications with IO devices cannot be performed by using the service
interface function.
Check item
Is the wiring of PROFINET correct?
Are the IO device names correct?
Have 'Service response area 1' (Un\G57000 to Un\G59087)' and 'Service
response area 2' (Un\G59250 to Un\G61337) been checked?
Does the IP address of the RJ71PN92 overlap with other IP addresses?
Does the IP address of the IO device overlap with other IP addresses?
If the above actions do not solve the problem, perform the self-diagnostic test to check for hardware failure. ( Page 131
Automatic Hardware Test)
When communications are unstable
The following lists the actions to be taken if communications are unstable.
Check item
Is the wiring of PROFINET correct?
Is the network overloaded?
If the above actions do not solve the problem, perform the self-diagnostic test to check for hardware failure. ( Page 131
Automatic Hardware Test)
Action
Check if the wiring of PROFINET is correct.
• Check if the names of the IO devices set in the PROFINET module setting
and the names of the IO devices actually connected are matched.
• Check if the names of the IO devices set in the PROFINET module setting
are not overlapped.
Check the Status of 'Service response area 1' (Un\G57000 to Un\G59087)
and 'Service response area 2' (Un\G59250 to Un\G61337). ( Page 152
Service response area 1, Service response area 2)
Disconnect the RJ71PN92 from the network and execute the PING command
from the personal computer to the IP address of the disconnected RJ71PN92.
When a response is received, change the IP address of the RJ71PN92.
Disconnect the IO device for which the I/O data exchange cannot be
performed and execute the PING command from the personal computer to the
IP address of the disconnected IO device.
When a response is received, change the IP address of the disconnected IO
device.
Action
Check if the wiring of PROFINET is correct.
Connect the IO device with unstable communications to the RJ71PN92 one-
on-one and check if the communication status is improved.
When the communication status is improved, the network may be overloaded.
Take the following actions.
• Check and correct the settings of the RJ71PN92, for example, set the
communication cycle longer, to reduce the communication load.
• Check if a large amount of unrelated data is received in broadcast. If it is
received, isolate the network or take other actions.
5.5 Troubleshooting by Symptom
5 TROUBLESHOOTING
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