Troubleshooting By Symptom - Mitsubishi Electric MELSEC iQ-R Series User Manual

4.4

Troubleshooting by Symptom

Perform these troubleshooting if data link cannot be performed even though no error is detected in the RJ71LP21-25.
If an error has occurred in the RJ71LP21-25, identify the error cause using the engineering tool. ( Page 92 Checking the
Module Status)
When cyclic transmission cannot be performed
The following lists the actions to be taken if cyclic transmission cannot be performed.
Check item
Is the D LINK LED of the control or normal station turned off?
Is the setting value of data link monitoring time shorter than that of actual link
scan time?
Is a target station set as a reserved station in "Network Range Assignment" of
"Required Settings" of the control station?
Has "Network Range Assignment" of "Required Settings" of the control station
been set?
Is there any station which exceed total number of stations set in "Network
Range Assignment" of "Required Settings" of the control station?
Are station numbers unique?
Is the data link set by the sub-control station when the control station is down?
Is the program correct?
Is the setting range in "Link Refresh Settings" of "Basic Settings" correct?
Is any link refresh target device in "Link Refresh Settings" of "Basic Settings"
overlapped with that of another network module?
Are the transfer ranges set in "Interlink Transmission Settings" of "Application
Settings" correct?
Are the source and destination modules set in "Interlink Transmission
Settings" of "Application Settings" correct?
Are MELSECNET/10 mode, MELSECNET/H mode, and MELSECNET/H
extended mode mixed?
If the above action does not solve the problem, perform the self-diagnostics test to check for hardware failure. (Page 95
Self-diagnostics test)
Action
Perform troubleshooting for when the D LINK LED turns off. ( Page 91
When the D LINK LED turns off)
Increase the setting value of "Data Link Monitoring Time" in "Application
Settings". (Page 65 Supplementary Cyclic Settings)
Cancel the reserved station setting. (Page 55 Network Range
Assignment)
Set "Network Range Assignment" of "Required Settings" of the control station.
(Page 55 Network Range Assignment)
Correct station numbers. (Page 54 Station No.)
Change the duplicated station number. (Page 54 Station No.)
Change the data link setting by the sub-control station when the control station
is down to "Yes".
• Check that data can be sent to the receiving station normally by switching
the CPU modules to STOP on the sending station and receiving station and
by the link devices on the sending station is turned on and off with the test
operation of the engineering tool to communicate data.
• If the data communications have no problem, check whether the program is
correct.
Correct the setting range in "Link Refresh Settings" of "Basic Settings".
(Page 61 Link Refresh Settings)
Correct the range setting in "Link Refresh Settings" of "Basic Settings".
(Page 61 Link Refresh Settings)
Correct the transfer ranges set in "Interlink Transmission Settings" of
"Application Settings". (Page 74 Interlink Transmission Settings)
Correct the source and destination modules set in "Interlink Transmission
Settings" of "Application Settings". (Page 74 Interlink Transmission
Settings)
Correct the mode setting. (Page 54 Station Type)
4.4 Troubleshooting by Symptom
4 TROUBLESHOOTING
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