Mitsubishi Electric MELSEC iQ-R Series User Manual page 396

Communications are unstable
When cyclic data transfer processing time or transmission delay time is long or when a transient transmission timeout
occurred, check the following items.
Check item
Is the L ER LED of the CC-Link IE TSN Plus module turned on?
Is the ambient temperature for the module outside the specified range?
Is any error shown in "Selected Station Communications Status Monitor" of
CC-Link IE TSN/CC-Link IE Field diagnostics?
Is there any noise affecting the system?
If the above actions do not solve the problem, perform the following test to check for an error.
• Module communication test ( Page 371 Module Communication Test)
SLMP communications failed
When communications using the SLMP cannot be performed, check the following items.
Check item
Has the connection with the external device been
opened?
Is the correct command format used for the command
type, device specification, address specification, and
others?
Did the external device send a command?
Was a response returned to the device that had sent
the command?
Is the same communication speed set for the
connected device and access destination?
In multicast mode, is a standard Ethernet device
connected to a local station or remote station that
does not support the multicast filter?
In multicast mode, are a local station and an Ethernet
device connected on the end side via a switching
hub?
*1 If the connection of only the external device is closed due to communication cable disconnection, personal computer restart, or other
reasons, reopen the connection using the same port used before the error occurred. A connection is not closed if another Active open
request is received from the external device with a different IP address or a port number.
If the above actions do not solve the problem, perform the module communication test to check for hardware failure. (
Page 371 Module Communication Test)
The control CPU of the local station cannot be synchronized time
When the time synchronization does not operate for the control CPU of a local station, check the following items.
Check item
Is the daylight savings time set to CPU modules different between the master
station and local stations?
Has the clock data been changed by the clock function of the CPU module?
18 TROUBLESHOOTING BY SYMPTOM
394
18.1 Troubleshooting Related to CC-Link IE TSN
Action
If turned on, perform troubleshooting for a case when the L ER LED is turned
on. ( Page 366 When the L ER LED turns on)
Keep the ambient temperature within the specified range by taking action
such as removing heat source.
If an error is identified, perform a module communication test.
Change the placement and/or wiring of the modules so that the system is not
affected by noise.
Action
• If the connection with the external device is not opened, perform the open processing.
• If an error occurs, check and eliminate the error cause.
Correct the command format. ( SLMP Reference Manual)
If the device did not send a command, send a command to the CC-Link IE TSN Plus module.
• If no response was returned, check if the correct IP address was specified in the command. If not,
correct the IP address and send the command again.
• If a response was returned, check the end and error codes to correct the faulty area.
Change the connection destination so that the connected device and access destination have the
same communication speed.
• Connect the local station or remote station supporting the multicast filter to the standard Ethernet
device.
• Set unicast mode.
• Take actions so that the Ethernet device does not receive multicast cyclic data.
Configure settings with the switching hub so that the multicast frame (with multicast MAC address
09:00:70:00:10:02 and 09:00:70:00:10:05) will not be transferred to the port of the standard Ethernet
device.
Action
Set the same daylight savings time to the CPU modules of the master station
and local stations.
Check whether the clock data has been changed by the clock function of the
CPU module.
*1