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Troubleshooting Section 7-1
Updating of numeric val-
ues and text is delayed.
Malfunction due to external noise Carry out grounding work in accordance with the
conditions by referring to 3-1-4 Grounding, page 34.
There are too many numeral/text dis-
plays on the displayed screen.
Reduce the number of numeral/text displays on the
screen for which updating is delayed.
The cycle time is extended due to
heavy processing at the host.
Shorten the host cycle time.
In an RS-422A/485 connection, there
is illegal branching or an erroneous
terminator setting.
Wire correctly by referring to SECTION 5 Connecting
to the Host from the RS-422A/485 Port.
Some of the elements
arranged on a normal
screen are not displayed.
The quantity of read data exceeds the
stipulated restriction.
Check the maximum number of elements by referring
to Display Restrictions in Appendix A of the Refer-
ence Manual, creating the screen data again, and
transmitting all of the screen data in a batch to the
NT631/NT631C.
The total of the element coefficients
for the displayed screen is greater
than 1024.
On an overlapping screen,
some of the set elements
are not displayed.
Since the data is transmitted from the
host in screen units, the number of
elements on the overlapping screen
has exceeded the maximum permis-
sible without being checked by the
Support Tool.
Check the maximum number of elements by referring
to Display Restrictions in Appendix A of the Refer-
ence Manual, creating the screen data again, and
then sending all the screen data in a batch to the
NT631/NT631C.
The System Menu cannot
be called up.
Display System Menu under Change
System Settings in the System
Installer mode is set to Disabled.
In the System Installer mode, set Display System
Menu to Enabled (page 147).
The following System
Menu operations are not
possible.
- Establishing the Transmit
mode
- Displaying the memory
switch setting screens
- Screen data memory
check
- Displaying the initializa-
tion menu
- Displaying the calendar/
time setting screen
Screen Memory Protect under
Change System Setting in the Sys-
tem Installer mode is set to Disabled.
In the System Installer mode, set Screen Memory
Protect to Enabled (page 147).
Screen Memory Protect has been set
to Disabled because the PT power
supply was turned OFF during dele-
tion of screen data.
Do not turn the PT power OFF during deletion of
screen data.
In the System Installer mode, first change the setting
for Screen Memory Protect to Enabled, then repeat
the screen data delete operation (page 148)
Cannot input numeric val-
ues
The upper/lower (max./min.) limit
check for numeric value input is in
effect.
Check the screen data’s upper/lower (max./min.) limit
check setting for numeric value input, and correct it if
necessary. Refer to 2-12 Inputting Numeric Values in
the Reference Manual for details.
The display is too faint. The contrast is too high. Reduce the contrast (page 187).
Cannot input numeric val-
ues/character strings.
Bit 5 of the PT status control area
(numeral/character string input) is set
to 1 (ON).
Set bit 5 to 0 (OFF). Refer to 2-2-1 PT Status Control
Area (Host ↔ PT) in the Reference Manual for
details.
The interlock function is set for the
input field and the controlling interlock
bit is OFF.
Inputs are prohibited in input fields when the corre-
sponding interlock bit is OFF. Check the status of the
corresponding interlock bit and turn it ON.
Window screen does not
open
Bit 6 of the PT status control area (PT
window opening) is set to 1 (ON).
Set bit 6 to 0 (OFF). Refer to 2-2-1 PT Status Control
Area (Host ↔ PT) in the Reference Manual for
details.
Cannot switch screens
with touch switches
Bit 4 of the PT status control area (PT
screen switching) is set to 1 (ON).
Set bit 4 to 0 (OFF). Refer to 2-2-1 PT Status Control
Area (Host ↔ PT) in the Reference Manual for
details.
Touch switch does not
work. (Buzzer sounds.)
The interlock function is set for the
touch switch and the controlling inter-
lock bit is OFF.
Touch switches are disabled when the corresponding
interlock bit is OFF. Check the status of the corre-
sponding interlock bit and turn it ON.
NT631/NT631C
Symptoms
Cause Remedy