When Cyclic Data Are Faulty - Mitsubishi Electric L26CPU-BT User Manual

15.2.2

When cyclic data are faulty

(1) Problems on abnormal cyclic data of a remote I/O station
Description
Check item
of problem
Refresh data
C1-1
area
Unable to
read/write cyclic
data
Parameter
C1-2
setting
Unable to RY- Refresh
C2-1
output. instruction
Check contents
Check if the automatic refresh
setting range is correct.
Check if there is no overlapping
with devices used in the
Is the automatic refresh set
program or in other networks.
properly?
32 points (fixed) per station,
(RX, RY, SB, SW)
also for 8 or 16 points I/O
modules. (except for the point
setting of the remote I/O
station)
Are the refresh by the
automatic refresh
Check the program.
parameter setting and the
Check the automatic refresh
refresh by the FROM/TO
parameter setting.
instruction executed
simultaneously?
Check the program.
Is the correct address of 32 points (fixed) per station,
the buffer memory being also for 8 or 16 points I/O
read/written? (RX, RY, SB, modules. (except for the point
SW) setting of the remote I/O
station)
Check if the corresponding
station bit, which is not
Is there any fault in the read/written at the reserved
reserved station setting? station specified status
(SW0074 to SW0077), is not
"1".
Is the refresh instruction Check if the refresh instruction
(SB0003) executed? (SB0003) is turned on.
CHAPTER 15 TROUBLESHOOTING
Check procedure Corrective action
Set the automatic refresh
parameter properly.
Set so as not to overlap the
refresh device with devices
used in the program or in
other networks.
Execute either one of the
refresh by the automatic
refresh parameter setting
or the refresh by the
FROM/TO instruction.
Access the corresponding
address.
Set so as not to overlap the
refresh device with devices
used in the program or in
other networks.
Release the reserved
station setting.
Turn on the refresh
instruction (SB0003).
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