- Displaying the memory
switch setting screens
- Screen data memory
check
- Displaying the
initialization menu
Screen Memory Protect has been
set to Disabled because the PT
power supply was turned OFF during
deletion 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 (pages 121
and
121)
Cannot input numeric
values
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.
Cannot input numeric
values/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
corresponding 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
interlock bit is OFF.
Touch switches are disabled when the
corresponding interlock bit is OFF. Check the status
of the corresponding interlock bit and turn it ON.
The display is dim. The contrast setting is too low. Increase the contrast with the contrast adjustment
on the back of the NT21.
Backlight defective, or its life has
expired.
Contact your OMRON service center. (The backlight
cannot be removed.)
The display is too faint. The contrast setting is too high. Reduce the contrast with the contrast adjustment on
the back of the NT21.
The digits in numeral
display come out as *.
The number of digits of a numeric
value in a numeral memory table
entry exceeds the set number.
• Confirm
the values of the PC words allocated to the
numeral memory table.
• Allocate one PC word to each numeral memory
table entry.
7-2 Responding to Displayed Error Messages
When
the NT21 displays an error message, find the corresponding symptoms in
the
appropriate table
below and respond by following the Remedy indicated in
the
table. For details of the error messages displayed when using Memory Unit
and
corrective action to take for them, refer to
3-5 Using a Memory Unit
in page
31.
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