Omron ns series Operation Manual page 98

4-1 Troubleshooting
4-1-3 Operation, Input, and Other Error Messages
Message
I/O comment reading failed.
Specify the address.
I/O Comment does not exist in
PLC.
I/O Comment does not exist in
PLC. Do you delete present I/O
Comment file?
Attempt to write invalid value to
I/O.
Cannot change present value
in run mode.
Cannot change the value
because timer/counter mode
differs in Ladder Monitor and
PLC.
Ladder Monitor: xxx mode
PLC: xxx mode
Please return to operation
screen to match the setting,
and restart Ladder Monitor.
Cannot change value because
circuit is changed. Please read
and set circuit again.
Cannot change value because
PLC and other tools are
accessing. Please release the
connection of PLC and other
tools.
Cannot remove memory card
because Ladder Monitor is
started from memory card.
Cannot change time/counter
present values. Display and
select a timer/counter you want
to change, then select
"Change".
Cannot search for output
instructions when addresses
with offsets are selected.
Cannot search for input
instructions when addresses
with offsets are selected.
96
Probable cause
Attempted to read I/O comments
from the PLC, but an I/O comment
file could not be created because
of insufficient space in the PT or
the Memory Card.
No address was specified when
adding an address for monitoring
by the Multiple I/O Monitor.
An attempt was made to read I/O
comments from a PLC that does
not have I/O comment data.
I/O comments were previously
read from a PLC, but the I/O
comment data was missing after
reconnecting to the same PLC.
Invalid value was input while
changing the present value.
Attempted to change the present
value or timer/counter value while
in RUN mode.
The timer/counter operating mode
setting is different for the Ladder
Monitor and the connected PLC.
A program section with a
timer/counter setting that was to
be changed was first read by the
Ladder Monitor and then changed
by the CX-Programmer.
An attempt was made to change a
timer/counter setting during online
editing or while the program was
being transferred.
An attempt was made to remove
the Memory Card while the Ladder
Program was operating from the
Memory Card.
A timer/counter address was
selected in the I/O Monitor and the
Change Button was pressed
when connected to a CJ2 CPU
Unit.
An attempt was made to search
for an input condition from an
output instruction that uses an
offset address.
An attempt was made to search
for an output instruction from an
input condition that uses an offset
address.
Counter measure
In the I/O Comment File Setting Dialog Box,
delete unnecessary I/O comment files to
increase available space.
Specify the address.
• Transfer the symbols tables to the PLC and
then read the I/O comments.
• Create an I/O comment file with the I/O
Comment Extraction Tool and store it in a
Memory Card or the PT.
Input the correct value for the I/O type.
Change the present value after setting
MONITOR mode or PROGRAM mode.
Restart the Ladder Monitor.
Read the program section again.
Close the connection and then change the
timer/counter setting.
The Memory Card cannot be removed while a
Ladder Monitor stored on the Memory Card is
operating. To remove the Memory Card, first
exit the Ladder Monitor and then perform the
operation in the Initialize Tab Page in the
System Menu.
Display the timer/counter instruction (e.g., by
using an output instruction search) select the
timer/counter, and then change the present
value.
The input condition cannot be found by
searching from an output instruction that uses
an offset address. Use an address search.
The output instruction cannot be found by
searching from an input condition that uses an
offset address. Use an address search.