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MELSEC-Q
8 TROUBLESHOOTING
Communication is normal.
Are all the stations
executing the baton
pass normally?
No
Check the baton pass status
of the applicable station with
GX Developer's network
monitor.
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?
Yes
Value of SW47
Read:SW42 (Host No.)
SW59 (Maximum number of
link stations)
SW5A (Maximum normal
baton pass station)
Is the host
number included?
Yes
<Troubleshooting>
Change the mode switch to
online. Or, wait for the current
online test being executed by
other station to complete.
<Troubleshooting>
Wait for the completion of the
online tests.
Yes
No
Value of SW48
Value 3 or more: Error code
<Troubleshooting>
Correct the error according to
the error code.
<Troubleshooting>
Wait for the completion of the
offline tests.
<Troubleshooting>
Change the module switch to
online.
Value 1:
Offline
Value 2:
Offline tests
<Troubleshooting >
Review the host number
setting and the common
parameter settings.
No
Value 1F:
Online tests
Values 11H to 14H
Online tests
Value 6: Being
disconnected (no baton pass)
Is the PLC
power supply
on?
Execute offline tests.
1) Hardware test
2) Self-loopback test
3) Internal self-loopback test
Test results
<Troubleshooting>
Replace the network module.
NG
<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.
Value 7:
Line error
The power is not being
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.
<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
<Cause>
OK
Yes
A
B
No
No
E
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