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4 TROUBLESHOOTING
4.2 Checking the Module Status
■Checking the status and result of module communication test.
The test status and result can be checked with LED display of the module.
■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.
Test status LED indication
Test in progress The dot matrix LED indicates "UCT".
Normal completion The dot matrix LED indicates "OK".
Abnormal end The ERR LED turns on and the dot matrix LED indicates "ERR" and error number alternately at intervals of 1 second.
Error
number
Description Action
1 Internal self-loopback test failure Please consult your local Mitsubishi representative.
2 External self-loopback test connection error 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.
3 External self-loopback test communication
error
Replace the Ethernet cable and perform the test again. If the test fails again, Please consult
your local Mitsubishi representative.
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