Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 405

8 TROUBLESHOOTING
Yes
E
Value 1F:
Offline tests
<Corrective action>
Change the mode setting
switch to online. Or, wait for
the current online test being
executed by other station to
complete.
B
Value 1:
Offline
<Corrective action>
Change the module setting
switch to online.
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A
Check the baton pass status
of the applicable station with
GX Developer's network
diagnostics.
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
<Corrective action>
Replace the network module.
Value of SW0047
Values 11 to 14
H
Online tests
Value 6: Being
<Corrective action>
disconnected (no baton pass)
Wait for the completion of the
online tests.
Read:SW0042 (Host No.)
SW0059 (Maximum number
of link stations)
SW005A (Maximum normal
baton pass station)
Is the host
No
number included?
<Corrective action>
Review the host number
setting and the common
Yes
parameter settings.
Value 2:
Value of SW0048
Offline tests
Value 3 or more: Error code
<Corrective action> <Corrective action>
Correct the error according to Wait for the completion of the
the error code. offline tests.
Is the programmable
No
controller power supply
on?
<Cause>
The power is not being
Yes
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.
Test results
NG
Value 7:
Line error
H
<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.
MELSEC-Q
OK
<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."
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