Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 122

4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION
RUN MNG
T.PASS D.LINK
SD RD
ERR. L ERR.
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(3) Starting a test/checking the result
The internal self-loopback test is executed when the CPU module is powered on
from off or reset.
Check the status by the indicator LED of the network module.
The T. PASS LED flashes during the test.
When the T. PASS LED flashes 20 times (approx. 10 seconds) or more and if
the ERR.LED does not flash, this condition indicates normal completion.
If the test is abnormally completed, the ERR. LED flashes.
Upon detection of an error, the test will be terminated (abnormal termination).
Before test

T.PASS : Off
When an error occurs, the error details must be checked with GX Developer. The
faulty area can be examined by replacing the module.
REMARKS
Testing status and the result can be checked in the following link special registers.
Baton pass status (host)
Cause of baton pass interruption
Offline test execution item/faulty
station (requesting side)
Offline test result (requesting side)
For details of how to check the error contents, refer to Chapter 8.
During test Normal completion of test

: Flashing : Flashing 20 times (approx. 10 seconds) or
more
Abnormal completion of test
ERR. : Flashing
SW0047
SW0048
SW00AC
SW00AD
MELSEC-Q
1F : Offline test
H
2 : Offline test
H
8 : Internal self-loopback
H
test
0 : Normal
1 or larger : Error code
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