Omron NS Series Setup Manual page 217

7-3 Troubleshooting and Maintenance
Symptoms at
Cannot enter
the device
monitor func-
tion.
Errors during Object Operation
Symptoms at
The numerical
and character
string update
is slow.
Some objects
in the screen
configuration
are not dis-
played.
The Log Flag
display does
not match the
actual log tim-
ing.
7-12
Causes
PT
The communica-
tions settings are
incorrect.
The PLC does not
support the device
monitor function.
Causes
PT
Communications
are unstable due to
external noise.
There are too many
Numeral Display &
Input objects and
String Display &
Input objects in the
display.
For RS-422A com-
munications, the
branch is incorrect
or the terminating
resistance is not
set properly.
The host is proc-
essing a large vol-
ume of data and
the cycle time is
long.
The message
communications
interval is too long.
A communications
error has occurred.
The control flags
set in the object
include Hide Dis-
play Flags.
The communica-
tions address set
for the event of log
timing is turning ON
and OFF at high
speed.
When using the device monitor, set the communications
mode as follows:
•
C-series PLCs:
1:1 NT Link or 1:N NT Links
•
CS1-series PLCs:
1:N NT Links (normal, high speed)
The device monitor function is not supported for Ethernet
or Controller Link.
The PLCs that support the device monitor function are re-
stricted. Check the PLC model being used.
(Refer to 6-8-4 Device Monitor.)
Perform noise countermeasures such as separating com-
munications cables from power lines.
Reduce the number of Numeral Display & Input and String
Display & Input objects in the screen where update is slow.
Wire correctly, referring to Appendix 4 Using NS-AL002
Converters.
Shorten the host cycle time.
In the CX-Designer, select PT - Communication Setting,
click the Comm-All Tab, and set a shorter communications
interval. (For details, refer to System Settings and Project
Properties in the CX-Designer's Online Help.)
Check the communications settings again.
Display the control flags for the objects set to be not dis-
played, as follows:
Display the Expansion Tab from the functional object prop-
erty setting using the CX-Designer. Select Display from
Display/Hide in the Control Flags Tab Page.
Turn ON the indirect address of the control flag set for the
object.
Set the ON/OFF cycle of the communications address for
events to a longer time.
Measures
Measures