Forward Loop Test/Reverse Loop Test - Mitsubishi Electric MELSEC iQ-R Series User Manual

Forward loop test/reverse loop test

Check the following.
• Checking the RJ71LP21-25 and optical fiber cable hardware
• Checking that the optical fiber cables are connected correctly at the OUT and IN connectors
For a system other than a redundant system
Operating procedure
1.
Connect all stations with optical fiber cables.
2.
Connect the OUT connector and IN connector of the RJ71LP21-25 for the executing station and executed station with
optical fiber cables.
3.
Set the module operation mode as follows.
[Navigation window]  [Parameter]  [Module Information]  RJ71LP21-25  [Application Settings]  [Module
Operation Mode]
Test target
Forward loop
Reverse loop
4.
Click the [Apply] button for the executing station and executed station.
5.
Write the module parameters to the CPU module of the executing station and executed station.
6.
Reset the CPU module of the executed station.
7.
Reset the CPU module of the executing station.
8.
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 LED indication
Test in progress 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". A station number is displayed for the executed
station.
Reverse loop test: The dot matrix LED of the executing station indicates "MD4". A station number is displayed for the executed
station.
Completed successfully 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.
Completed with an error 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.
Module operation mode setting
Executing station
"Forward Loop Test"
"Reverse Loop Test"
Executed station
"Online"
"Online"
4 TROUBLESHOOTING
4.2 Checking the Module Status
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