Mitsubishi Electric MELSEC iQ-R Series User Manual page 116

Remote device station
Problem Check item
Cyclic data D1-1
cannot be read/
written.
D1-2
Word data D2-1
cannot be read/
written.
Cyclic data D3-1
(lower area)
cannot be read/
written.
Data cannot be D4-1
output from RY.
A remote device D5-1
station does not
become ready
(RXn1B remains
off).
4 TROUBLESHOOTING
114
4.5 Troubleshooting by Symptom
Description
Refresh data Has the link refresh been correctly
area set? (RX, RY, RWw, RWr, SB,
SW)
Is the buffer memory area
accessed correctly? (RX, RY,
RWw, RWr, SB, SW)
Is any of refresh devices (RX, RY,
RWw, RWr) of the module
parameters set for the redundant
system?
Parameter Is a station to which reading/
setting writing cannot be performed
specified as a reserved station?
Parameter Do the parameter settings match
setting with the status of the connected
modules?
Parameter Do the parameter settings match
setting with the status of the connected
modules?
Refresh Is the refresh instruction executed
instruction after changing parameters by the
dedicated instruction?
Initial setting Has the initial setting completed?
Has the remote device station
initialization procedure registration
completed?
Is the initial setting for the remote
device station correct?
Has the initialize setting been
enabled?
Check method
Check if no device overlaps with
ones used in programs or in other
networks.
Check if no device overlaps with
ones used in programs or in other
networks.
Check if any of refresh devices
(RX, RY, RWw, RWr) is set by
mistake for the redundant system.
Check if the bit corresponding to
the faulty station is not "1" in
'Reserved station specification
status' (SW0074 to SW0077).
Check if a remote I/O station is
connected to the corresponding
station number.
Check if a module with the small
number of occupied stations is not
connected to the corresponding
station number.
Check if 'Refresh instruction when
changing parameters by the
dedicated instruction' (SB0003) is
turned on.
Were RYn18 (Initial data
processing completion flag) and
RYn19 (Initial data setting request
flag) turned on and off?
• Check if 'Remote device station
initialization procedure
registration instruction'
(SB000D) is turned off.
• Check 'Remote device station
initialization procedure
registration instruction result'
(SW005F).
• Check the parameters.
• Check the program.
Check if 'Remote device station
initialization procedure registration
instruction' (SB000D) has been
turned on using a program.
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.
• Avoid any refresh devices (RX,
RY, RWw, RWr) setting for the
redundant system.
• Use program (Un\G) to make
a refresh.
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
processing.
Change the registration.
Correct the remote device station
initial setting.
Turn on 'Remote device station
initialization procedure registration
instruction' (SB000D) using a
program and check that the
initialize setting is enabled.