Omron NT21 User Manual

6-1SectionTroubleshooting
417
PT 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 words in 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/communication port
as follows when using the Programming Console
function:
- With C-series PC: 1:1 NT Link
- With CS/CJ-series PC: 1:N NT Link
A Programming Console is
connected.
With all PCs except for the CS/CJ-series PCs, 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.
(Refer to Programming Console Function in section
6 in the Setup Manual.)
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 screen doesn’t
change even though the
Device Monitor function
has been called from the
PT l
The communications protocol setting
at the PT is not 1:1 NT Link or 1:N
NT Link.
Check the memory switches (fourth screen) and set
the connected PC’s serial port protocol to 1:1 NT
Link or 1:N NT Link. Set the same protocol in the
PC.
PT status control area.
(NT31/NT31C and
NT631/NT631C only)
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 an OMRON PC. Refer to
Version Display in section 6 in the Setup Manual
and check the system program type. Only OMRON
Direct Access system programs with version
numbers Version 3. and higher can use the
Device Monitor function.
The words that were
being monitored the last
time that Device Monitor
was used are not
displayed the next time
th t D i M it i
• The PT was turned OFF.
• The PT was reset.
The words monitored by Device Monitor are
retained even if the Device Monitor is closed, but
the information is cleared when the PT is turned
OFF or reset.
Specify the desired words again.
py
that Device Monitor is
called. (NT31/NT31C and
NT631/NT631C only)
The cable was disconnected while
Device Monitor was being used and
then connected to a PC with a
smaller data area.
If the cable is connected again to another PC, the
PT will clear any word addresses that aren’t
supported in that PC. Check the ranges of data
areas in the PC and set word addresses within
those ranges.

Omron NT21 Specifications

General

Brand	Omron
Model	NT21
Category	Touch terminals
Language	English