7-3 Troubleshooting and Maintenance
Symptoms at
PT
Causes Measures
The communica-
tions settings are
incorrect.
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.
Cannot enter
the device
monitor func-
tion.
The PLC does not
support the device
monitor function.
The PLCs that support the device monitor function are re-
stricted. Check the PLC model being used.
(Refer to 6-8-4 Device Monitor.)
Errors during Object Operation
Symptoms at
PT
Causes Measures
Communications
are unstable due to
external noise.
Perform noise countermeasures such as separating com-
munications cables from power lines.
There are too many
Numeral Display &
Input objects and
String Display &
Input objects in the
display.
Reduce the number of Numeral Display & Input and String
Display & Input objects in the screen where update is slow.
For RS-422A com-
munications, the
branch is incorrect
or the terminating
resistance is not
set properly.
Wire correctly, referring to Appendix 4 Using NS-AL002
Converters.
The host is proc-
essing a large vol-
ume of data and
the cycle time is
long.
Shorten the host cycle time.
The numerical
and character
string update
is slow.
The message
communications
interval is too long.
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.)
A communications
error has occurred.
Check the communications settings again. Some objects
in the screen
configuration
are not dis-
played.
The control flags
set in the object
include Hide Dis-
play Flags.
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.
The Log Flag
display does
not match the
actual log tim-
ing.
The communica-
tions address set
for the event of log
timing is turning ON
and OFF at high
speed.
Set the ON/OFF cycle of the communications address for
events to a longer time.
7-12
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