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4 TROUBLESHOOTING
4.4 Troubleshooting by Symptom
253
4
When communication is unstable
The following lists the actions to be taken when link scan time or transmission delay time is long or when a transient
transmission timeout occurred.
If the above actions do not solve the problem, perform the following tests to check for an error.
• Module communication test (
Page 221 Module communication test)
• Cable test (
When IP communications cannot be performed using the IP packet transfer function
Before troubleshooting the problem as listed below, perform the IP communication test and take actions according to the error
code. (
Page 48 IP communication test)
If the problem cannot be solved using the IP communication test, take actions listed below.
Check item
Action
■
RJ71EN71, RnENCPU
Is the L ER LED of the master or slave station on?
■
RJ71GF11-T2
Is the L ERR LED of the master or slave station on?
■
RJ71EN71, RnENCPU
Perform troubleshooting for when the L ER LED turns on. (
■
RJ71GF11-T2
Perform troubleshooting for when the L ERR LED turns on. (
Is the ambient temperature for the module within the specified range?
Keep the ambient temperature within the specified range by taking action
such as removing heat source.
Is any error shown in "Selected Station Communication Status Monitor" of CC-
Link IE Field Network diagnostics?
If an error is identified at P1 or P2, perform a cable test and a module
communication test.
Is there any noise affecting the system?
Check the wiring condition.
Check item
Action
Is the IP address of the connected Ethernet device correct?
Set an IP address meeting the IP address setting rules. (
Is the IP address already in use?
• For the Ethernet device, set the IP address different from that of other devices on the
network, such as a Ethernet-equipped module, master/local module, and Ethernet
adapter module.
• Disconnect the Ethernet device from the line and execute the Ping command to the IP
address of the disconnected Ethernet device. If a response is received even though
the device is disconnected, the IP address is already in use. Change the IP address.
Has a communication time over error occurred in the IP
communication test?
• When "Dynamic Routing" under "Application Settings" is set to "Disable", correct the
relay station network number in "Routing Setting" of "CPU Parameter".
• When "Dynamic Routing" under "Application Settings" is set to "Enable", check
'Communication path determination status' (Un\G24480 to Un\G24495) to check that
the communication path to the transfer destination network number which is set in the
third octet of the Ethernet device IP address is determined.
Have the routing parameters correctly been set? (Only when
"Dynamic Routing" under "Application Settings" is set to "Disable")
• Correct "Routing Setting" of "CPU Parameter".
• When the first and second octets of the IP address are the same for the request
source device, request destination device, and modules between them, set the routing
parameters so that the third octet of the IP address of the Ethernet device is used as
the target station network number.
Is the network number of the Ethernet device side (the third octet of
the IP address) the same as that of modules and another Ethernet
device? (This applies only when the request source external device,
request destination external device, and modules between them
have the same first and second octets of the IP address.)
Change the network number of the Ethernet device side (the third octet of the IP
address) to the one different from that of modules and another Ethernet device.
Master station
Station No.1
Station No.2
Network No.1
Network No.
3
Network No.
2
192.168.
3
.1
192.168.
2
.1
192.168.
3
.30
192.168.
2
.30
192.168.1.1
(Automatically assigned)
192.168.1.125
192.168.1.2
(Automatically assigned)
Ethernet
CC-Link
IE Field
Network
Change the network numbers to those not used for other stations.
IP address
Summary of Contents for MELSEC iQ-R04ENCPU
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Page 61: ...1 FUNCTIONS 1 3 IP Packet Transfer Function 59 1 ...
Page 385: ...383 I Transient transmission 15 ...
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