Mitsubishi Electric Q80BD-J61BT11N, User Manual

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MELSEC
16 TROUBLESHOOTING
Description of problem Check item Check procedure
Cannot communicate from a
local station (remote register
RWw) to the master station
(remote register RWr).
Is the corresponding local station performing data
link?
• Check the LED displays on the corresponding
local station.
• Check the communication status of the master
station with other stations (SW0080 to SW0083)
Is data written to the correct address of the remote
register RWw (buffer memory) of the local station?
Check the user program.
Is data read from the correct address of the
remote register RWr (buffer memory) of the
master station?
Check the user program.
Is the corresponding local station number
recognized by the master station?
• Check the parameters.
• Check the total number of stations (SW0070).
• Check the maximum communication station
number (SW0071).
• Check the number of connected modules
(SW0072).
Is the corresponding station set as a reserved
station?
• Check the parameters.
• Check the reserved station designation status
(SW0074 to SW0077).
Are there any duplicate station numbers?
• Check the station number setting.
• Check the installation status (SW0069).
• Check the station number duplicate status
(SW0098 to SW009B).
Do the settings match?
• Check the installation status (SW0069).
• Check the station number duplicate status
(SW0098 to SW009B).
• Check the installation/parameter matching status
(SW009C to SW009F).
The local station does not
operate with the specified
number of occupied stations.
Is the QJ61BT11 of function version A or the
A80BD-J61BT11 set to occupy 2 or 3 stations?
Set the number of occupied stations to 1 or 4.
Cannot stop data link.
Is the data link stop (SB0002) turned on? Check the user program.
Has an error occurred? Check the data link stop result (SW0045).
Cannot restart data link.
Is the data link restart (SB0000) turned on? Check the user program.
Has an error occurred? Check the data link restart result (SW0041).
Is the corresponding station disconnected?
• Check the cable connection visually or with a line
test.
• Check the parameters (for local station).
• Check the operation status of the programmable
controller CPU in the corresponding station.
The remote station/local
station/intelligent device
station/standby master station
does not start up.
Do the parameters for the number of modules and
station information match the settings of the
modules that do not start up?
Check the parameters.
Are there any duplicate station numbers? Check the station number setting.
The local station or standby
master station does not start up
and the "ERR." LED turns on.
Is 65 or larger station No. set to the local station
(including the number of occupied stations)? Check the station No. setting and parameters of
the local station or standby master station.
Does the mode of the master station match that of
the local station or standby master station? Check the parameters of the master station and
local station or standby master station.
Has the parameter of the master station that will
return to the system by the standby master
function been rewritten?
Check the parameters of the master station.
Faulty stations cannot be
detected.
Is the station set as an error invalid station? Check the parameters.
Are there any duplicate station numbers? Check the station number setting.
Faulty stations are generated
depending on the transmission
rate.
Can the faulty station be identified using the
communication status of other stations (SW0080
to SW0083)? • Check the switch settings for the faulty station.
• Check that the cable is properly wired.
• Check that the shield of the cable is grounded.
• Connect the terminal resistors that match the
cable type used to the terminal stations at both
ends of the CC-Link system.
Can communication be performed normally if the
transmission rate is reduced to a lower speed
such as 156 kbps?