Mitsubishi Electric QJ71LP21 Reference Manual page 225

8 TROUBLESHOOTING
Yes
<Troubleshooting>
1) Station number duplication
2) Remote master station
duplication
3) Checks for switch setting
errors
Takes action according to the
contents of SW47 and the
error code contents that have
been stored in SW48.
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C
Is the
send and receive
Yes
data within the system
specifications?
No
Value 0:
The host
Value of SW47
transmitting
normally
Value 3: No host send area
Value 4: Abnormal parameters detected
Value 5: Parameters not received
<Troubleshooting>
<Troubleshooting>
Check the contents of
Checks the contents of each
the common parameters
parameter that has been set
and station inherent
in the refresh parameters
parameters.
and remote I/O station that
have been set by the CPU
of the remote master station.
If SW47=3, consider the following as a possible cause.
Only the station number has been set in the common parameters and there is no link device allocation.
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
<Troubleshooting>
Replace the network module
Takes action according to
the contents of SW47 and
the error code contents that
have been stored in SW48.
receive data according
<Troubleshooting>
Checks the contents of each
parameter that has been set
in the refresh parameters
and remote I/O station that
have been set by the CPU
of the remote master station.
Is the
power supplied to the
power source
module?
Yes
OK
Test results?
NG
<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
MELSEC-Q
Is the send/
Yes
to system
specifications?
No
Normal communication
No
<Cause>
The power is not being
supplied.
Or, the overcurrent protection
is active.
<Troubleshooting>
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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