Mitsubishi Electric MELSEC iQ-R Series User Manual page 104

■Checking the status when the operation is completed with an error
When an error is detected, the test is immediately completed (with an error).
The following describes the causes of the failure in the optical loop system.
• The cable on the forward loop or reverse loop is disconnected.
• The sending side and receiving side on the forward loop is not connected with a cable.
• The sending side of the forward loop is connected to the sending side of the reverse loop, and the receiving side of the
forward loop is connected to the receiving side of the reverse loop.
• The sending side and receiving side on the reverse loop is not connected with a cable.
• Cable failure has occurred.
• The cable being tested is mismatched or disconnected.
• Hardware failure has occurred.
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
0_1 Data error in station-to-station test
1_1, 3_1 Station-to-station test completed with an
error
2_1 Station-to-station test completed with an
error
Precautions
The station-to-station test detects errors such as cable disconnection, and cable failure in the configuration where only the
OUT connector of the executing station and the IN connector of the executed station are connected with optical fiber cables.
Since the IN connector of the executing station and the OUT connector of the executed station are ignored by the station-to-
station test, errors, such as cable disconnection, are not detected.
4 TROUBLESHOOTING
102
4.2 Checking the Module Status
Action
After resetting the CPU module of the station-to-station test (executed station), reset the CPU
module of the station-to-station test (executing station). 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.
Check that the system configuration and module operation mode are correctly set. If the test
fails again, please consult your local Mitsubishi representative.