Mitsubishi Electric Q81BD-J61BT11 User Manual page 254

16 TROUBLESHOOTING
Description of problem
Cannot communicate from a
local station (remote output RY)
to the master station (remote
input RX).
Cannot communicate from the
master station (remote register
RWw) to a local station
(remote register RWr).
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Check item
Is the corresponding local station performing data
link?
Is data written to the correct address of the remote
output RY (buffer memory) of the local station?
Is data read from the correct address of the
remote input RX (buffer memory) of the master
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?
Is the corresponding local station performing data
link?
Do the number of occupied stations set for the
local station match the station information of the
master station?
Is data written to the correct address of the remote
register RWw (buffer memory) of the master
station?
Is data read from the correct address of the
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 duplicate station numbers?
Do the settings match?
Check procedure
• 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).
• 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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