Mitsubishi MELSEC-Q Series User Manual page 246

13 TROUBLESHOOTING
Description of problem
Unable to write data to the remote register RWw in
the remote device station.
Unable to communicate from the master station
(remote output RY) to a local station (remote input
RX).
Unable to communicate from a local station (remote
output RY) to the master station (remote input RX).
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Check item
Are there any overlap station numbers?
Do the settings match?
Are the refresh set with the automatic refresh
parameters and the refresh executed with the
FROM/TO instructions performed simultaneously?
Is the remote device station initialization procedure
registration being executed?
Is the corresponding local station performing data
link?
Is data written to the correct address of remote
output RY (buffer memory) of the master station?
Is data read from the correct address of remote
input RX (buffer memory) of the local station?
Is the corresponding local station number
recognized by the master station?
Is the corresponding station set as a reserved
station?
Are there any overlap station numbers?
Do the settings match?
Is the corresponding local station performing data
link?
Is data written to the correct address of remote
output RY (buffer memory) of the local station?
Is data read from the correct address of remote
input RX (buffer memory) of the master station?
Is the corresponding local station number
recognized by the master station?
MELSEC-Q
Check procedure
• Check the station number setting.
• Check the loading status (SW0069).
• Check the station number overlap status
(SW0098 to SW009B).
• Check the loading status (SW0069).
• Check the station number overlap status
(SW0098 to SW009B).
• Check the loading/parameter consistency status
(SW009C to SW009F).
• Check the sequence program.
• Check the automatic refresh parameter settings.
Check if the remote device station initialization
procedure registration instruction (SB000D) is on.
• Check the LED display on the corresponding local
station.
• Check the other station data link status of the
master station. (SW0080 to SW0083)
• Check the sequence program.
• Check the automatic refresh parameter setting.
• Check the sequence program.
• Check the automatic refresh parameter setting.
• Check the parameters.
• Check the total number of stations (SW0070).
• Check the max. communication station number
(SW0071).
• Check the number of connected modules
(SW0072).
• Check the parameters.
• Check the reserved station specified status
(SW0074 to SW0077).
• Check the station number setting.
• Check the loading status (SW0069).
• Check the station number overlap status
(SW0098 to SW009B).
• Check the loading status (SW0069).
• Check the station number overlap status
(SW0098 to SW009B).
• Check the loading/parameter consistency status
(SW009C to SW009F).
• Check the LED display on the corresponding local
station.
• Check the other station data link status of the
master station. (SW0080 to SW0083)
• Check the sequence program.
• Check the automatic refresh parameter setting.
• Check the sequence program.
• Check the automatic refresh parameter setting.
• Check the parameters.
• Check the total number of stations (SW0070).
• Check the max. communication station number
(SW0071).
• Check the number of connected modules
(SW0072).
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