Omron Programmable Terminals NT631 Setup Manual page 244

Troubleshooting
NT631/NT631C
Symptoms
The graph display does not
change.
The trend graph display
does not agree with the
actual time axis.
The Programming Console
function cannot be used.
The Device Monitor func-
tion cannot be used.
The memory table display
contents differ from the ini-
tial value set at the Sup-
port Tool.
Cause
One of the percentage display set-
tings — −100%, 0%, or 100% — is
incorrect.
The cycle for graph display update
processing is longer than the set
sampling cycle.
The communications settings are
incorrect.
A Programming Console is con-
nected.
The PLC does not support the Pro-
gramming Console function.
The system program for other ven-
dor's PLCs has been installed. (PLC
models other than OMRON.)
The communications settings are not
correct.
The PLC does not support the Device
Monitor function.
The system program installed in the
PT is for a PLC maker other than
OMRON.
Since the memory table is allocated
to the host memory, the display is
updated in accordance with the con-
tents of the host memory.
The battery voltage has dropped and
the data in the memory table has
been destroyed.
Since ON is set for the resume func-
tion, the initial values of the screen
data memory are not written to the
memory tables.
The numeral memory table is speci-
fied as the destination for a mathe-
matical table's results.
Remedy
Set the −100%, 0%, and 100% values in the following
relationship:
−100% value < 0% value < 100% value
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.
Set the communications method as follows when
using the Programming Console function.
• With C-series PLC: 1:1 NT Link
• With CS/CJ-series PLC:
1:N NT Link (standard or high-speed)
It is not possible to use a Programming Console and
the Programming Console function at the same time.
Disconnect the Programming Console.
Not all PLCs support the Programming Console func-
tion. Check the model of PLC you are using. (6-12
Programming Console Function)
The Programming Console function can be used only
when the system program for OMRON PLCs is
installed. Install the correct system program.
Set the communications method as follows when
using the Device Monitor function.
• With C-series PLCs: 1:1 NT Link or 1:N NT Link
• With CS/CJ-series PLCs:
1:N NT Link (standard or high-speed)
Not all PLCs support the Device Monitor function.
Check the model of PLC you are using. Refer to 6-13
Device Monitor Function for details.
The Device Monitor function can be used only when
the PT is connected to a PT with the system program
for OMRON PLCs installed. Install a system program
that supports the Device Monitor function.
When the contents of the memory table are set as a
fixed value, do not allocate the memory table to the
host.
Replace the battery and execute memory table initial-
ization. (7-3-1 Replacing the Battery, page 241, and
6-4-5 Initializing the Memory Tables, page 141)
Execute memory table initialization. (6-4-5 Initializing
the Memory Tables, page 141)
If the resume function does not need to be used, use
the NT631/NT631C with the resume function OFF.
(6-9-10 Setting the Resume Function, page 177)
Calculations are executed continuously while the PT
is operating and the calculation results are automati-
cally written to the memory table. Specify another
numeral memory table or a word in the host.
Section 7-1
227