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MELSEC-Q
8 TROUBLESHOOTING
C
No
Value of SW47
Value 3: No host send area
Value 4: Abnormal parameters detected
Value 5: Parameters not received
<Troubleshooting>
Check the contents of
the common parameters
and station inherent
parameters.
Value 0:
The host
transmitting
normally
<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.
Yes
Normal communication
Is the
send and receive
data within the system
specifications?
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.
Is the send/
receive data according
to system
specifications?
No
<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.
Yes
Is the
"RUN" LED of the
applicable station
lit?
Takes action according to
the contents of SW47 and
the error code contents that
have been stored in SW48.
<Troubleshooting>
Yes
Is the
power supplied to the
power source
module?
Yes
Yes
Execute offline tests.
1) Hardware test
2) Self-loopback test
3) Internal self-loopback test
Test results?
NG
Replace the network module
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>
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.
<Cause>
No
No
No
D
Is the
"ERR" LED of the
applicable station
lit?
OK
E
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