Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 406

8 TROUBLESHOOTING
Yes
E
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C
Is the
send and receive
data within the system
specifications?
No
Value of SW0047
Value 3: No host send area
Value 4: Abnormal parameters detected
Value 5: Parameters not received
<Corrective action>
Check the contents of
the common parameters
and station inherent
parameters.
: In case of SW0047 = 3, the following two causes may be considered:
1) The link device has not been assigned; only the station number was set with the
common parameters.
2) The link device was assigned, but "Send/receive link points = 0" was
specified in the station inherent parameters setting.
D
Is the
"RUN" LED of the
No
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
Correct the error according
to the content of the error
code stored in SW0048.
Yes
Communication is normal.
Value 0:
The host
transmitting
normally
<Corrective action>
Check the contents of the
common parameters and
station inherent parameters
of the stations to which data
is not sent.
Is the
power supplied to the
power source
module?
Yes
OK
Test results?
NG
<Cause>
Possible module watchdog
timer error
<Corrective action>
Check:
1) Review 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."
MELSEC-Q
No
<Cause>
The power is not being
supplied.
Or, the overcurrent protection
is active.
<Corrective action>
1) Review the power supply
status.
2) 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.
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