Troubleshooting By Symptom; When Cyclic Transmission Cannot Be Performed - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

9.4

Troubleshooting by Symptom

This section describes troubleshooting method by symptom. If an error has occurred in the master/intelligent device module,
identify the error cause using the engineering tool.

When cyclic transmission cannot be performed

Remote I/O station
Problem Check item
Cyclic data C1-1 Refresh data
cannot be read/ area
written.
C1-2 Parameter
Setting
Remote device station
Problem Check item
Cyclic data D1-1 Refresh data
cannot be read/ area
written.
D1-2 Parameter
Setting
Word data D2-1 Parameter
cannot be read/ Setting
written.
Cyclic data D3-1 Parameter
(lower area) Setting
cannot be read/
written.
Description
Have refresh devices been
correctly set in the module
parameters? (RX, RY, SB, SW)
Are the link refresh to refresh
devices using the module
parameters and refresh using a
program (Un\G or FROM/TO
instructions) being performed at
the same time?
Is the correct buffer memory area
being read from/written to? (RX,
RY, SB, SW)
Is a station to which reading/
writing cannot be performed
specified as a reserved station?
Description
Has the link refresh been correctly
set? (RX, RY, RWw, RWr, SB,
SW)
Is the buffer memory area
accessed correctly? (RX, RY,
RWw, RWr, SB, SW)
Is a station to which reading/
writing cannot be performed
specified as a reserved station?
Do the parameter settings match
with the status of the connected
modules?
Do the parameter settings match
with the status of the connected
modules?
Check method
Check if the refresh devices have
been set within the range.
Check if no device overlaps with
ones used in programs or in other
networks.
Note that the number of points of
8-point or 16-point I/O modules
per station is 32 points (fixed).
• Check the program.
• Check the refresh devices set in
the module parameters.
Check the program. Note that the
number of points of 8-point or 16-
point I/O modules per station is 32
points (fixed).
Check if the bit corresponding to
the faulty station is not "1" in
'Reserved station specification
status' (SW0074, SW0075).
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 the bit corresponding to
the faulty station is not "1" in
'Reserved station specification
status' (SW0074, SW0075).
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.
9 TROUBLESHOOTING
9.4 Troubleshooting by Symptom
Corrective Action
Correct the refresh device setting.
Set the devices so that they do not
overlap with ones used in
programs and in other networks.
Execute only one of the refresh
processes; either link refresh to
refresh devices using the module
parameters or refresh using a
program (Un\G or FROM/TO
instructions).
• Access the correct buffer
memory area in the
corresponding station.
• Set the devices so that they do
not overlap with ones used in
programs and in other
networks.
Cancel the reserved station
setting.
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.
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