Mitsubishi MELSEC-Q Series User Manual page 247

13 TROUBLESHOOTING
Description of problem
Unable to communicate from a local station (remote
output RY) to the master station (remote input RX).
Unable to communicate from the master station
(remote register RWw) to a local station (remote
register RWr).
Unable to communicate from a local station (remote
register RWw) to the master station (remote register
RWr).
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Check item
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?
Do the occupied station number settings for a local
station match to the station information for a master
station?
Is data written to the correct address of remote
register RWw (buffer memory) of the master
station?
Is data read from the correct address of remote
register RWr (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
register RWw (buffer memory) of the local station?
Is data read from the correct address of remote
register RWr (buffer memory) of the master station?
Is the corresponding local station number
recognized by the master station?
MELSEC-Q
Check procedure
• 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).
• 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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