Mitsubishi Electric MELSEC-Q Series User Manual page 287

(2) Problems due to cyclic data error in a remote device station
Problem Check item
Refresh data
D1-1
area
Cyclic data
cannot be
read/written.
Parameter
D1-2
setting
Word data
Parameter
cannot be D2-1
setting
read/written.
Cyclic data
(lower area) Parameter
D3-1
cannot be setting
read/written.
Data cannot be
Refresh
output from D4-1
instruction
RY.
A remote
device station
does not
D5-1 Initial setting
become ready
(RXn1B
remains off).
Description
Has the auto refresh been Check if no device overlaps
correctly set (RX, RY, RWw, with ones used in programs
RWr, SB, and SW)? or in other networks.
Is the accessed buffer
Check if no device overlaps
memory area correct (RX,
with ones used in programs
RY, RWw, RWr, SB, and
or in other networks.
SW)?
Check if the bit
Isn't a station to which
corresponding to the faulty
reading/writing cannot be
station is not "1" in Reserved
performed specified as a
station specified status
reserved station?
(SW0074 to SW0077).
Do the parameter settings Check if a remote I/O station
match with the status of the is not connected to the
connected modules? corresponding station.
Check if a module with the
Do the parameter settings
small number of occupied
match with the status of the
stations is not connected to
connected modules?
the corresponding station.
Is Refresh instruction when Check if Refresh instruction
changing parameters by the when changing parameters
dedicated instruction by the dedicated instruction
(SB0003) on? (SB0003) is on.
Were Initial data processing
Has the initial setting completion flag (RYn18) and
completed? Initial data setting request
flag (RYn19) turned off?
Check if Remote device
station initialization
Has the remote device procedure registration
station initialization instruction (SB000D) is off.
procedure registration Check Remote device
completed? station initialization
procedure registration
instruction result (SW005F).
Is the initial setting for the
Check the parameter.
remote device station
Check the program.
correct?
Check if Remote device
station initialization
Has the initial setting been procedure registration
enabled? instruction (SB000D) has
been turned on using a
program.
CHAPTER 11 TROUBLESHOOTING
Check method Corrective action
Set the devices so that they
do not overlap with ones
used in programs and in
other networks.
Access the correct buffer
memory area in the
corresponding station.
Set the devices so that they
do not overlap with ones
used in programs.
Cancel the reserved station
setting.
Match the model set by the
parameter with that of the
connected module.
Match the number of
occupied stations set by the
parameter with that of the
connected module.
Turn on Refresh instruction
when changing parameters
by the dedicated instruction
(SB0003).
Perform the initial data
process.
Change the registration.
Correctly configure the initial
setting for the station.
Turn on Remote device
station initialization
procedure registration
instruction (SB000D), and
check that the initial setting
is enabled.
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