Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual page 224

■Checking the status and result of module communication test.
The test status and result can be checked with LED display of the module.
Test status
Test in progress
Normal completion
Abnormal end
■Error number when the test abnormally ended.
The dot matrix LED indicates the error number with the form of "Port number Error number".
For example, "1 3" is displayed when error No.3 occurs in P1.
If the module communication test fails, check the following.
Error Description
number
1 Internal self-loopback test failure
2 External self-loopback test connection error
3 External self-loopback test communication
error
4 TROUBLESHOOTING
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4.2 Checking the Module Status
LED indication
The dot matrix LED indicates "UCT".
The dot matrix LED indicates "OK".
The ERR LED turns on and the dot matrix LED indicates "ERR" and error number alternately at intervals of 1 second.
Action
Please consult your local Mitsubishi representative.
Check the Ethernet cable connection or replace the Ethernet cable, and perform the test
again. If the test fails again, please consult your local Mitsubishi representative.
Replace the Ethernet cable and perform the test again. If the test fails again, Please consult
your local Mitsubishi representative.