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

4.3

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 load is applied to the module due to the weight of wires or
cables.
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 or flashes

When turning on
Check item
Check whether any warning has been issued.
When flashing
Check item
Check whether any input signal error has occurred.
Cause
The base number and slot number of the A/D
converter 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 state of the module.
Place the wires or cables connected to the module in a duct or clamp them so
that the weight of wires or cables does not cause the load applied to the
module.
Perform the online module change. For details, refer to the following.
 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 'Latest error code' (Un\G0) and take actions described in the list of
error codes.
Page 80 List of Error Codes
Action
Check 'Warning output flag (Process alarm upper limit)' (Un\G36), 'Warning
output flag (Process alarm lower limit)' (Un\G37), 'Warning output flag (Rate
alarm upper limit)' (Un\G38), and 'Warning output flag (Rate alarm lower limit)'
(Un\G39).
Take actions described in the alarm code list.
Page 82 List of Alarm Codes
Action
Check 'Input signal error detection signal' (XC) or 'Input signal error detection
flag' (Un\G40).
Take actions described in the alarm code list.
Page 82 List of Alarm Codes
Action
Turn on Module selection cancel request flag
(SM1615).
4 TROUBLESHOOTING
4.3 Troubleshooting by Symptom
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