Mitsubishi MELSEC Q Series User Manual page 392

13 TROUBLESHOOTING
Description of problem
Unable to receive input from a remote I/O station.
13
Unable to output data from a remote I/O station.
Unable to receive remote input (RX) of a remote
device station.
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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?
Are the refresh set with the automatic refresh
parameters and the refresh executed with the
FROM/TO instructions performed simultaneously?
Is the corresponding remote I/O station performing
data link?
Is data written to the correct address of remote
output RY (buffer memory)?
Is the master station parameter information area
being used (CPU built-in internal parameters,
default parameters) correct?
Is the corresponding remote I/O 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?
Are the refresh set with the automatic refresh
parameters and the refresh executed with the
FROM/TO instructions performed simultaneously?
Is the corresponding remote device station
performing data link?
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 sequence program.
• Check the automatic refresh parameter settings.
• Check the LED display on the corresponding
remote I/O station.
• Check the other station data link status of the
master station. (SW0080 to SW0083)
• Check the sequence program.
• Check the automatic refresh parameter settings.
Check parameter information (SW0067).
• 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 sequence program.
• Check the automatic refresh parameter settings.
• Check the LED display on the corresponding
remote device station.
• Check the other station data link status of the
master station. (SW0080 to SW0083)
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