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7-1SectionTroubleshooting
233
NT31/NT31C Symptoms RemedyCause
The graph display does
not change.
One of the percentage display
settings — −100%, 0%, or 100% —
is incorrect.
Set the −100%, 0%, and 100% values in the
following relationship:
−100% value < 0% value < 100% value
The trend graph display
does not agree with the
actual time axis.
The cycle for graph display update
processing is longer than the set
sampling cycle.
Delete other elements on the same screen as the
trend graph that are allocated to the host and have
a high update frequency. Or lengthen the sampling
cycle.
The Programming
Console function cannot
be used.
The communication settings are
incorrect.
Set the communication method as follows when
using the Programming Console function.
S With C-series PLC: 1:1 NT Link
S With CS1-series PLC:
1:N NT Link (standard or high-speed)
A Programming Console is
connected.
It is not possible to use a Programming Console and
the Programming Console function at the same
time. Disconnect the Programming Console.
The PC does not support the
Programming Console function.
Not all PCs support the Programming Console
function. Check the model of PC you are using.
(6-12 Programming Console Function, page 221)
The system program for other
vendor’s PCs has been installed.
(PC models other than OMRON.)
The Programming Console function can be used
only when the system program for OMRON PCs is
installed. Install the correct system program.
The Device Monitor
function cannot be used.
The communications settings are not
correct.
Set the communication method as follows when
using the Device Monitor function.
S With C-series PLCs: 1:1 NT Link or 1:N NT Link
S With CS1-series PLCs:
1:N NT Link (standard or high-speed)
The PC does not support the Device
Monitor function.
Not all PCs support the Device Monitor function.
Check the model of PC you are using. Refer to 6-13
Device Monitor Function for details.
The system program installed in the
PT is for a PC maker other than
OMRON.
The Device Monitor function can be used only when
the PT is connected to a PT with the system
program for OMRON PCs installed. Install a system
program that supports the Device Monitor function.
The memory table display
contents differ from the
initial value set at the
Support Tool.
Since the memory table is allocated
to the host memory, the display is
updated in accordance with the
contents of the host memory.
When the contents of the memory table are set as a
fixed value, do not allocate the memory table to the
host.
pp
The battery voltage has dropped and
the data in the memory table has
been destroyed.
Replace the battery and execute memory table
initialization. (7-3-1 Replacing the Battery, page 244,
and 6-4-5 Initializing the Memory Tables, page 147)
Since ON is set for the resume
function, the initial values of the
screen data memory are not written
to the memory tables.
Execute memory table initialization. (6-4-5
Initializing the Memory Tables, page 147)
If the resume function does not need to be used,
use the NT31/NT31C with the resume function OFF.
(6-9-10 Setting the Resume Function, page 181)
The numeral memory table is
specified as the destination for a
mathematical table’s results.
Calculations are executed continuously while the PT
is operating and the calculation results are
automatically written to the memory table. Specify
another numeral memory table or a word in the
host.