Mitsubishi Electric QJ71LP21 Reference Manual page 112

4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION
CPU
module
Switch position
Display section
Switch position
Display section
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(2) Starting the test
Set the STOP/RUN switch of the CPU module to STOP position. When resetting
the CPU module, use the RESET/L.CLR switch.
Perform this operation on the station to be tested first, then on the station to
execute the test.
Center
3
4
5
STOP RUN
RESET L.CLR
(3) Checking the test result
The T.PASS LED of the network module flashes at approximately 0.5 s intervals.
The T.PASS LED flashes when the test is normal, and the ERR. LED flashes
when an error occurs.
[Normal test result]
Before test
(during RESET)
RUN MNG
T.PASS D.LINK
SD RD
ERR. L ERR.
[Abnormal test result]
Before test
(during RESET)
RUN MNG
T.PASS D.LINK
SD RD
ERR. L ERR.
<Possible causes of errors>
A loopback was executed because of a wiring error, a faulty optical fiber cable or
abnormality was detected in other station.
1) If wiring is incorrect
Check the connections of IN and OUT connectors and other connectors. If
an incorrect connection is found, connect properly.
2) If an optical fiber cable is faulty or other station is abnormal
Replace the defective cable or module.
RESET
3
4
5
STOP RUN
RESET L.CLR
Before test
(during STOP)
RUN MNG
T.PASS D.LINK
SD RD
ERR. L ERR.
Before test
(during STOP)
RUN MNG
T.PASS D.LINK
SD RD
ERR. L ERR.
Or L. ERR.
MELSEC-Q
Center
3
4
5
STOP RUN
RESET L.CLR
Test complete
Test is completed when
T.PASS flashes 20 times
(approximately 10 s).
Test complete
An error has occurred
when T.PASS lights
up and ERR. flashes.
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