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

4.6

Troubleshooting by Symptom

If any function of the remote head module does not operate normally, perform troubleshooting by checking the following items.
If the ERR LED is on or flashing, eliminate the error cause using the engineering tool.
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 remote head module turned on?
Is "I/O Assignment Setting" in the [I/O Assignment] tab of the "System
Parameter" window correctly set?
Is the switch on the remote head module set to RUN?
Is the RUN LED of the remote head module turned on?
If the above actions do not solve the problem, check the link device assignment of the master station and the refresh target
device setting of refresh parameters for an error. ( User's manual for the master/local module used)
When transient transmission cannot be performed
The following table lists the actions to be taken if transient transmission cannot be performed.
Check item
Is the D LINK LED of the remote head module turned on?
If the above actions do not solve the problem, refer to the troubleshooting of the master/local module. ( User's manual for
the master/local module used)
When the POWER LED of the power supply module turns off
When the POWER LED of the power supply module turns off, check the following items.
Check item
Is the power supply module mounted on the base unit normally?
Is the RUN LED of the remote head module turned on?
Is the power supply voltage appropriate?
Does the internal current consumption within the entire system exceed the
rated output current of the power supply module?
Does the POWER LED turn on when power is restored to the system after all
modules, except the power supply module, have been removed?
If the POWER LED of the power supply module does not turn on even after the items above are checked and the actions are
taken, the possible cause is a hardware failure of the power supply module. Please consult your local Mitsubishi
representative.
Action
If the D LINK LED is turned off or flashing, perform troubleshooting using LED.
( Page 90 When the D LINK LED turns off, Page 90 When the D LINK
LED is flashing)
Set the I/O assignment correctly. ( MELSEC iQ-R Module Configuration
Manual)
Set the switch of the remote head module to RUN.
If the RUN LED is turned off, perform troubleshooting using LED. ( Page
89 When the RUN LED turns off)
Action
If the D LINK LED is off or flashing, perform troubleshooting using LED. (
Page 90 When the D LINK LED turns off, Page 90 When the D LINK LED is
flashing)
Action
Remove the power supply module from the base unit, and mount it back on
the base unit. Then, restore power to the system.
The power supply module has failed. Replace the power supply module.
Supply power voltage within the specified range. ( MELSEC iQ-R Module
Configuration Manual)
Review the system configuration so that the internal current consumption
does not exceed the rated output current. ( MELSEC iQ-R Module
Configuration Manual)
One of the modules except the power supply module has failed.
Repeatedly supply power to the system, returning the modules to the system
one by one. The last module mounted immediately before the POWER LED
turns off has failed. Replace the corresponding module.
4.6 Troubleshooting by Symptom
4 TROUBLESHOOTING
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