Mitsubishi Electric MELSEC iQ-R Series User Manual page 107

■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
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.
4 TROUBLESHOOTING
4.2 Checking the Module Status
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