Mitsubishi QJ71LP21 Reference Manual page 228

8 TROUBLESHOOTING
Yes
E
Value 1F:
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
Yes
executing the baton
pass normally?
Communication is normal.
No
Check the stations that are
not executing the baton pass.
Is the "RUN"
No
LED of the applicable
station lit?
Yes
Is the "ERR"
LED of the applicable
station lit?
Execute offline tests.
1) Hardware test
2) Self-loopback test
3) Internal self-loopback test
No
<Troubleshooting>
Replace the network module.
Value of SW47
Values 11 to 14
H
Online tests
Value 6: Being
<Troubleshooting>
disconnected (no baton pass)
Wait for the completion of the
online tests.
Read:SW42 (Host No.)
SW59 (Maximum number of
link stations)
SW5A (Maximum normal
baton pass station)
Is the host
No
number included?
<Troubleshooting >
Review the host number
setting and the common
Yes
parameter settings.
Value 2:
Value of SW48
Offline tests
Value 3 or more: Error code
<Troubleshooting> <Troubleshooting>
Correct the error according to Wait for the completion of the
the error code. offline tests.
Is the PLC
No
power supply
on?
<Cause>
The power is not being
Yes supplied. Or, the overcurrent
protection is active.
<Troubleshooting>
• Verify the power supply
status.
• Check that the total current
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
Value 7:
Line error
H
<Troubleshooting>
Read from SWB8 to SWFF
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.
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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