Troubleshooting By Symptom; When The Run Led Flashes Or Turns Off; When The Err Led Turns On; When The Alm Led Turns On - Mitsubishi Electric MELSEC iQ-R Series User Manual

3.3

Troubleshooting by Symptom

When the RUN LED flashes or turns off

When flashing
Check item
Check whether the module is selected as
the target module for the online module
change.
When turning off
Check item
Check whether the power is supplied.
Check whether the capacity of the power supply module is enough.
Check whether the module is mounted properly.
Check whether the module replacement is allowed in the process of the online
module change.
Cases other than the above

When the ERR LED turns on

When turning on
Check item
Check whether any error has occurred.

When the ALM LED turns on

When turning on
Check item
Check whether any alarm has occurred.
Cause
The base number and slot number of the pulse input
module have been set in Module selection
specification (Base No.) (SD1600) and Module
selection specification (Slot No.) (SD1601).
Action
Check that the supply voltage of the power supply module is within the rated
range.
Calculate the current consumption of mounted modules, such as the CPU
module, I/O modules, and intelligent function modules to check that the power
capacity is enough.
Check the mounting status of the module.
Perform the online module change. For details, refer to the following manual.
 MELSEC iQ-R Online Module Change Manual
Reset the CPU module and check if the RUN LED turns on.
If the RUN LED still remains off, the possible cause is a failure of the module.
Please consult your local Mitsubishi representative.
Action
Check 'CH1 Error code' (Un\G9) and take actions described in the list of error
codes.
Page 52 List of Error Codes
Error codes are stored in different buffer memory areas depending on the
channel on which the error occurred. For details on buffer memory addresses
other than CH1, refer to the following.
Page 65 Lists of buffer memory addresses
Action
Check 'CH1 Alarm code' (Un\G10) and take actions described in the list of
alarm codes.
Page 54 List of Alarm Codes
Alarm codes are stored in different buffer memory areas depending on the
channel on which the alarm occurred. For details on buffer memory addresses
other than CH1, refer to the following.
Page 65 Lists of buffer memory addresses
Action
Turn on Module selection cancel request flag (SM1615).
3 TROUBLESHOOTING
3.3 Troubleshooting by Symptom
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