Mitsubishi Electric MELSEC iQ-R Series User Manual page 106

■Checking the status when the operation is completed with an error
When an error is detected, the test is immediately completed (with an error).
Loopback is performed due to wiring mistake, optical fiber cable failure, or other station failure.
• If wiring is incorrect, check the connections of the IN and OUT connectors.
• If the optical fiber cable or another station is faulty, replace the defective optical fiber cable or module with the new one.
When the test is completed with an error, the dot matrix at the front side of the RJ71LP21-25 indicates an error number. Take
actions according to the error number displayed. "_" in the error number is displayed as a space on the dot matrix display.
Error No. Description
1_1 Forward loop test completed with an error
2_1 Reverse loop test completed with an
error
For a redundant system
Operating procedure
1.
Connect all stations with optical fiber cables.
2.
Connect the IN connector and OUT connector of the RJ71LP21-25 for the executing station and executed station with
optical fiber cables.
3.
Set the operation mode and the module operation mode for the redundant system as follows.
When the power of the both systems cannot be turned on or off, execute the forward/reverse loop test in the separate mode.
Set station
Executing station
Executed station
4.
Click the [Apply] button for the executing station and executed station.
5.
Reset the CPU module of the executed station.
6.
Reset the CPU module of the executing station.
7.
If the test is completed with an error, check the following.
■Checking the status and result
Check the status and result of forward/reverse loop test with the LED indicator of the module.
Test status
Test in progress
Completed successfully
Completed with an error
4 TROUBLESHOOTING
104
4.2 Checking the Module Status
Redundant system
Stations other than the
redundant system
LED indication
The RUN LED is turned on, the ERR LED is turned off, and the T PASS LED flashes.
The SD/RD LED is turned on, and the L ERR LED is turned on or off.
Forward loop test: The dot matrix LED of the executing station indicates "MD3".
Reverse loop test: The dot matrix LED of the executing station indicates "MD4".
Since the test is repeated during normal operation, the test is judged to have been completed successfully when the T PASS LED
flashes 20 times (for about 10 seconds) or more.
The ERR LED flashes.
Forward loop test: The dot matrix LED indicates "ER3" and error number alternately at intervals of one second.
Reverse loop test: The dot matrix LED indicates "ER4" and error number alternately at intervals of one second.
Action
Check that the optical fiber cable is connected correctly.
Replace the optical fiber cable and perform the test again. If the test fails again, please consult
your local Mitsubishi representative.
Check that the optical fiber cable is connected correctly.
Replace the optical fiber cable and perform the test again. If the test fails again, please consult
your local Mitsubishi representative.
Operation mode Module operation mode setting
Backup mode "Forward Loop Test" or "Reverse Loop Test"
Separate mode
Backup mode "Online"
Separate mode
