Mitsubishi Electric QJ71LP21 Reference Manual page 224

8 TROUBLESHOOTING
Yes
<Troubleshooting>
Checks for duplicate station
numbers, duplicate
designated control stations
and switch setting errors.
Takes action according to the
contents of SW47 and the
error code contents that have
been stored in SW48.
Online tests
<Troubleshooting>
Change the mode switch to
online. Or, wait for the current
online test being executed by
other station to complete.
B
Value 1:
Offline
<Troubleshooting>
Change the module switch to
online.
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A
Check the baton pass status
of the applicable station with
GX Developer's network
monitor.
Are all the stations
executing the baton
pass normally?
No
Check the stations that are
not executing the baton pass.
Is the "RUN"
LED of the applicable
station lit?
Yes
Is the "ERR"
LED of the applicable
station lit?
No
Value of SW47
Values 11
Value 1F:
Online tests
Value 6: Being
disconnected (no baton pass)
Read:SW42 (Host No.)
SW59 (Maximum number of
link stations)
SW5A (Maximum normal
baton pass station)
Is the host
number included?
Yes
Value of SW48
Value 3 or more: Error code
<Troubleshooting>
Correct the error according to
the error code.
Yes
Communication is normal.
No
Is the PLC
No
power supply
on?
<Cause>
The power is not being
Yes
supplied. Or, the overcurrent
protection is active.
Execute offline tests. <Troubleshooting>
• Verify the power supply
1) Hardware test
status.
2) Self-loopback test
• Check that the total current
3) Internal self-loopback test
consumption of the modules
installed on the base unit
does not exceed the rated
output current of the power
supply module used.
Test results
NG
<Troubleshooting>
Replace the network module.
Value 7:
Line error
to 14
H H
<Troubleshooting>
<Troubleshooting>
Wait for the completion of the
Read from SWB8 to SWFF
online tests.
and check the line status.
From the contents of SB/SW,
check the cable and connector
connected to the station
where the error was detected.
No
<Troubleshooting >
Review the host number
setting and the common
parameter settings.
Value 2:
Offline tests
<Troubleshooting>
Wait for the completion of the
offline tests.
MELSEC-Q
OK
<Cause>
May be due to module WDT
error
<Troubleshooting>
1) Reexamine base mounting
2) Reset remote I/O module
3) Replace remote I/O
module and check
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