Mitsubishi Electric Q81BD-J61BT11 User Manual page 253

16 TROUBLESHOOTING
Description of problem
Cannot write data to the remote
register RWw of a remote
device station.
Cannot communicate from the
master station (remote output
RY) to a local station
(remote input RX).
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Check item
Is the corresponding remote device station
performing data link?
Is data read from the correct address of the
remote register RWw (buffer memory)?
Is the correct master station's parameter
information area (CPU internal parameters, default
parameters) being used?
Is the corresponding remote device station
number recognized by the master station?
Is the corresponding station set as a reserved
station?
Are there any duplicate station numbers?
Do the settings match?
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 the remote
output RY (buffer memory) of the master station?
Is data read from the correct address of the
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 duplicate station numbers?
Do the settings match?
Check procedure
• Check the LED displays on the corresponding
remote device station.
• Check the communication status of the master
station with other stations (SW0080 to SW0083).
Check the user program.
Check the parameter information (SW0067).
• Check the parameters.
• Check the total number of stations (SW0070).
• Check the maximum communication station
number (SW0071).
• Check the number of connected modules
(SW0072).
• Check the parameters.
• Check the reserved station designation status
(SW0074 to SW0077).
• Check the station number setting.
• Check the installation status (SW0069).
• Check the station number duplicate status
(SW0098 to SW009B).
• Check the installation status (SW0069).
• Check the station number duplicate status
(SW0098 to SW009B).
• Check the installation/parameter matching status
(SW009C to SW009F).
Check if the remote device station initialization
procedure registration instruction (SB000D) is on.
• Check the LED displays on the corresponding
local station.
• Check the communication status of the master
station with other stations (SW0080 to SW0083).
Check the user program.
Check the user program.
• Check the parameters.
• Check the total number of stations (SW0070).
• Check the maximum communication station
number (SW0071).
• Check the number of connected modules
(SW0072).
• Check the parameters.
• Check the reserved station designation status
(SW0074 to SW0077).
• Check the station number setting.
• Check the installation status (SW0069).
• Check the station number duplicate status
(SW0098 to SW009B).
• Check the installation status (SW0069).
• Check the station number duplicate status
(SW0098 to SW009B).
• Check the installation/parameter matching status
(SW009C to SW009F).
MELSEC
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