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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
diagnostics.
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 SW0047
Read:SW0042 (Host No.)
SW0059 (Maximum number
of link stations)
SW005A (Maximum normal
baton pass station)
Is the host
number included?
Yes
<Corrective action>
Change the mode setting
switch to online. Or, wait for
the current online test being
executed by other station to
complete.
<Corrective action>
Wait for the completion of the
online tests.
Yes
No
Value of SW0048
Value 3 or more: Error code
<Corrective action>
Correct the error according to
the error code.
<Corrective action>
Wait for the completion of the
offline tests.
<Corrective action>
Change the module setting
switch to online.
Value 1:
Offline
Value 2:
Offline tests
<Corrective action>
Review the host number
setting and the common
parameter settings.
No
Value 1F:
Offline tests
Values 11
H
to 14
H
Online tests
Value 6: Being
disconnected (no baton pass)
Is the programmable
controller power supply
on?
Execute offline tests.
1) Hardware test
2) Self-loopback test
3) Internal self-loopback test
Test results
<Corrective action>
Replace the network module.
NG
<Corrective action>
Read from SW00B8 to SW00FF
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.
<Corrective action>
• 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>
Possible module watchdog
timer error
<Corrective action>
Check:
1) Verify the base
installation.
2) Reset the CPU.
3) Replace the module.
4) Whether or not
the host's I/O slot is
assigned to a "Empty area."
<Cause>
OK
Yes
A
B
No
No
E
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