Omron NS - REV 12 Setup Manual page 258

7-3 Troubleshooting and Maintenance
Symptoms at
Screens are
slow to
change.
The touch
panel does not
respond.
The display is
dark.
Cannot enter
the device
monitor func-
tion.
Errors during Object Operation
Symptoms at
The numerical
and character
string update
is slow.
7-12
Cause
PT
Communications
are not possible
with the host.
PT has malfunc-
tioned due to exter-
nal noise.
The touch panel is
damaged.
The brightness set-
ting is too low.
The backlight is
faulty or its service
life has expired.
The communica-
tions settings are
incorrect.
The PLC does not
support the device
monitor function.
Cause
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.
Possible countermeasure
If a communications error is displayed, refer to 5-2-7 Com-
munication Errors and Countermeasures in the NS Series
Programmable Terminals PROGRAMMING MANUAL
(Cat. No. V073).
Communications errors will not be displayed if automatic
recovery is set for communications. If automatic recovery is
set, check if communications with the host are possible
using the communications test on the System Menu. If
more than one host is registered, test communications with
all of the hosts.
Reset the PT, and wire it according to noise prevention
measures.
Test the touch panel using the hardware check in the Sys-
tem Menu. If an error has occurred, contact your nearest
OMRON representative.
Increase the backlight brightness in the PT Tab Page of the
System Menu.
The backlight must be replaced. Contact your nearest
OMRON representative.
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.)
Possible countermeasure
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 3 Using NS-AL002
Converters.