Mitsubishi Electric MELSEC iQ-R Series User Manual page 398

Although the data link is normal, communications for the link device failed
When the link device cannot communicate although the data link is normal (D LINK LED is on), check the following items.
Check item
Is "Reserved/Error Invalid Station" of the slave station
set to "Reserved Station" in "Network Configuration
Settings" of the master station?
Is the input/output bit setting or input/output word
setting of the slave station set in "Network
Configuration Settings" of the master station? (Simple
display)
Are "RX Setting", "RY Setting", RWw Setting", "RWr
Setting", "LB Setting", and "LW Setting" of the slave
station set in "Network Configuration Settings" of the
master station? (Detailed display)
Does the slave station support the link devices set in
"Network Configuration Settings" of the master
station?
Is the link refresh setting range correct?
Is the refresh range of "CPU Side" in "Refresh
Settings" overlapped with that of "CPU Side" of
another network module?
Is the transfer range set in "Interlink Transmission
Settings" correct?
Are the settings in "Transfer Source Module" and
"Transfer Destination Module" of "Interlink
Transmission Settings" correct?
When the local station cannot receive cyclic data from
another station, is "Communication Mode" of the
master station set to "Multicast"?
Is an error with the error code 1D20H detected in the
CC-Link IE TSN Plus module?
Has an inter-module synchronous transmission
omission occurred?
*1 For details on the processing time, refer to the following.
Page 522 CC-Link IE TSN Processing Time
18 TROUBLESHOOTING BY SYMPTOM
396
18.1 Troubleshooting Related to CC-Link IE TSN
Action
Set "Reserved/Error Invalid Station" of the slave station to "No Setting".
Set a link device used in the slave station correctly.
Set a link device used in the slave station correctly.
Correct the link devices to be assigned to the slave station in "Network Configuration Settings" of the
master station.
Correct the setting in "Refresh Settings" of "Basic Settings".
Correct the setting in "Refresh Settings" of "Basic Settings".
Correct the transfer range set in "Interlink Transmission Settings".
Correct the settings in "Transfer Source Module" and "Transfer Destination Module" of "Interlink
Transmission Settings".
Set "Communication Mode" of the master station to "Multicast".
• The communication cycle can be so rapid that slave stations fail to perform cyclic transmission in
time. Therefore, change the setting value to a value greater than the current setting for
"Communication Period Interval Setting" and "Transient transmission time' of "Communication
Period Setting" under "Basic Settings".
• To use the inter-module synchronization function, also set the inter-module synchronization cycle
longer than the current setting in "Fixed Scan Interval Setting" under "Inter-module Synchronization
Setting" in "System Parameter".
• Check that there is no error in slave stations.
The amount of time equal to the total value of the execution time of the inter-module synchronous
interrupt program (I44) and the cyclic processing time
inter-module synchronization cycle (next communication cycle). Consider the following actions.
• Consider the possibility of reducing the volume of the synchronous interrupt program. (Reduction of
program processing time)
• Consider the possibility of reducing the refresh target data for the synchronization target modules.
(Reduction of refresh processing time)
• Check if a module that does not need to be synchronized is set as a synchronization target module.
• Change the inter-module synchronization cycle set in the inter-module synchronization cycle setting
and the values for "Communication Period Interval Setting" and "Transient transmission time' of
"Communication Period Setting" under "Basic Settings" to values longer than the current settings.
*1
may not have passed completely by the next