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MELSEC-QnA
13 TROUBLESHOOTING
Trouble description Details to be checked Confirmation action
Is the remote device station performing data
link?
Verify using the following means:
• LED display of the module
• Other station data link status (SW0080 to SW0083)
of the master station
Is the refresh instruction (Yn0) turned on at
the master station?
Verify the sequence program.
Is data written to the correct address of
remote output RY (buffer memory)?
Verify the sequence program.
Is the station incorrectly set as reserved? Verify parameters.
Cannot turn on/off remote output (RY)
from a remote device station.
Did the station number overlap? Verify the station number.
Is the remote device station performing data
link?
Verify using the following means:
• LED display of the module
• Other station data link status (SW0080 to SW0083)
of the master station
Is data read from the correct address of the
remote register RWr (buffer memory)?
Verify the sequence program.
Is the station incorrectly set as reserved? Verify the parameters.
Unable to get the remote register
(RWr) data from a remote device
station.
Did the station number overlap? Verify the station number.
Is the remote device station performing data
link?
Verify using the following means:
• LED display of the module
• Other station data link status (SW0080 to SW0083)
of the master station
Is data written to the correct address of
remote register RWw (buffer memory)?
Verify the sequence program.
Is the station incorrectly set as reserved? Verify the parameters.
Unable to write data onto the remote
register (RWw) at a remote device
station.
Did the station number overlap? Verify the station number.
Is the corresponding local station performing
data link?
Check the LED indication of the corresponding local
station.
Check Other station data link status (SW0080 to
SW0083) of the master station.
Is the refresh instruction (Yn0) at the master
station turned on?
Verify the sequence program.
Is data written to the correct address of the
remote output RY (buffer memory) at the
master station?
Verify the sequence program.
Is data read from the correct address of the
remote input RX (buffer memory) at the local
station?
Verify the sequence program.
Is the station incorrectly set as reserved? Verify the parameters.
Unable to communicate from the
master station (remote output RY) to
the local station (remote input RX).
Did the station number overlap? Verify the station number.
Is the corresponding local station performing
data link?
Check the LED indication of the corresponding local
station.
Check Other station data link status (SW0080 to
SW0083) of the master station.
Is the refresh instruction (Yn0) at the local
station turned on?
Verify the sequence program.
Is data written to the correct address of
remote output RY (buffer memory) at the
local station?
Verify the sequence program.
Is data read from the correct address of the
remote input RX (buffer memory) at the
master station?
Verify the sequence program.
Is the station incorrectly set as reserved? Verify the parameters.
Unable to communicate from the local
station (remote output RY) to the
master station (remote input RX).
Did the station number overlap? Verify the station number.