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Chapter 5 Troubleshooting; Checking With Led - Mitsubishi Electric MELSEC iQ-R Series User Manual

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5
TROUBLESHOOTING
This section describes troubleshooting of the RJ71PN92.
5.1

Checking with LED

This section describes troubleshooting using the LEDs.
Error status can be determined by status of the RUN LED and the ERR LED.
RUN LED
ERR LED
Off
On, flashing
On
Flashing
On
On
*1 When multiple errors occur, the error status is displayed in the order of major, moderate, and minor.
When the RUN LED turns off
When the RUN LED turns off after the RJ71PN92 is powered on, check the following.
Check item
Is the RJ71PN92 mounted correctly?
Is the CPU module powered off and on or reset while parameters are written?
If the above actions do not solve the problem, perform the self-diagnostic test to check for hardware failure.
( Page 131 Automatic Hardware Test)
When the ERR LED turns on or is flashing
When the ERR LED turns on or is flashing, check the following.
Check item
Does the system watchdog timer error (Error code: 3C00H) occur?
Does any error occur in the module diagnostics?
If the above actions do not solve the problem, perform the self-diagnostic test to check for hardware failure.
( Page 131 Automatic Hardware Test)
5 TROUBLESHOOTING
5.1 Checking with LED
*1
Error status
Description
Major error
An error such as hardware failure or memory failure. The module stops operating.
Moderate error
An error such as system bus failure. The module stops operating.
Minor error
An error such as communication failure. The module continues operating.
Action
Securely mount the RJ71PN92 on the base unit.
Power off and on or reset the CPU module and start the RJ71PN92.
After that, write the parameters again.
Action
Check the corrective action for this error. ( Page 135 List of Error Codes)
Take the actions displayed on the window.

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