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

5
TROUBLESHOOTING
This chapter describes troubleshooting for the RJ71CN91.
5.1

Checking with LED

This section describes troubleshooting using LED.
Error status can be determined by status of the RUN LED and the ERR LED.
RUN LED ERR LED
Off 
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 powering on the RJ71CN91, check the following.
Check item
Is the RJ71CN91 mounted correctly?
When the ERR LED turns on or is flashing
When the ERR LED turns on or is flashing, check the following.
Check item
Does any error occur in the module diagnostics?
When the CAN ERR LED turns on or is flashing
When the CAN ERR LED turns on or is flashing, check the following.
Check item
Is any error displayed in 'Error status' (Un\G29)?
*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 parameter error, which affects module operation. The module stops
operating.
Minor error An error such as communication failure. The module continues operating.
If an error with error code 1804H (bus off state occurrence) occurs, it is necessary to restart
the module to restore communication.
Action
Securely mount the RJ71CN91 on the base unit.
Action
Take the actions displayed on the window.
Action
Refer to the following.
Page 139 Troubleshooting Using the Buffer Memory
5 TROUBLESHOOTING
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5.1 Checking with LED
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