Mitsubishi QJ71LP21 Reference Manual page 226

8 TROUBLESHOOTING
YES
<Troubleshooting>
E
Takes action according to
the contents of SW47 and
the error code contents
that have been stored in
SW48.
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(b) For the remote I/O module
Start
Host
"T.PASS" LED on?
NO
"RUN" LED on?
YES
"ERR" LED on?
NO
YES "REM." LED on?
NO
Diagnosis with
GX Developer
POINT
If the "T. PASS" LED turns on and off improperly and looks instable, refer to the
following.`
<Cause>
The line status is assumed to be instable.
<Troubleshooting>
1) Check the connector for loose connection and the cable for a break.
2) Check that the cable used conforms to the specifications.
3) Check that the overall length and interstation distance conform to the
specifications. (Refer to Section 4.8 Cable Connection.)
Yes
Host baton bus is normal
End
Host normal status
NO
Is power
being supplied to
the power supply
module?
YES
Implement offline tests
(1) Hardware test
(2) Self-loopback test
(3) Internal self-loopback test
Test results?
OK
NG
Replace remote I/O
<Causes>
module
May be due to unit WDT
error.
<Troubleshooting>
1) Reexamine base
mounting
2) Reset remote I/O
module
3) Replace module and
check
MELSEC-Q
NO
<Causes>
Power is not supplied or
over-current protection
has been activated.
<Troubleshooting>
1) Reexamine power
supply status.
2) Check that the total
current consumption
of the units connected
to the base unit does
not exceed the rated
output of the power
supply module.
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