Problems Due To Cyclic Data Error - Mitsubishi Electric MELSEC-Q Series User Manual

11.2.2

Problems due to cyclic data error

(1) Problems due to cyclic data error in a remote I/O station
Problem Check item
Refresh data
C1-1
area
Cyclic data
cannot be
read/written.
Parameter
C1-2
setting
Data cannot be
Refresh
output from C2-1
instruction
RY.
284
Description
Have refresh devices (RX,
RY, SB, and SW) been
correctly set in the network
parameter?
Are the auto refresh to
refresh devices using the
network parameter and the
refresh process using a
program (Un\G or
FROM/TO instructions)
executed at the same time?
Is the correct buffer memory
area read/written (RX, RY,
SB, and SW)?
Isn't a station to which
reading/writing cannot be
performed specified as a
reserved station?
Is Refresh instruction when
changing parameters by the
dedicated instruction
(SB0003) on?
Check method
Check if the 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) (except the
case when the remote I/O
station points setting is
configured).
Check the program.
Check the refresh devices
set in the network
parameter.
Check the program.
Note that the number of
points of 8-point or 16-point
I/O modules per station is 32
points (fixed) (except the
case when the remote I/O
station points setting is
configured).
Check if the bit
corresponding to the faulty
station is not "1" in Reserved
station specified status
(SW0074 to SW0077).
Check if Refresh instruction
when changing parameters
by the dedicated instruction
(SB0003) is on.
Corrective action
Correct the device setting.
Set the devices so that they
do not overlap with ones
used in programs and in
other networks.
Execute either of the refresh
processes.
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.
Turn on Refresh instruction
when changing parameters
by the dedicated instruction
(SB0003).