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6-11SectionSystem Maintenance
195
Setting Using Brightness and Contrast Adjustment Screen
Display screen number 9030 using either a touch switch with switch screen func-
tion, or by specifying the display screen in the PT status control area.
Adjust the brightness with the touch switches
(High, Middle, Low) in the left half of the
screen.
Press Quit.
The brightness is set, and the NT31/NT31C
returns to the previous screen.
6-11-2 Displaying/Setting the Calendar and Clock
The NT31/NT31C has a clock function for setting and displaying the date and
time.
This section describes how to display and set the clock data by menu operation
from the System Menu.
Reference: S The clock function does not strictly check the date and day of the week set-
tings. When setting the clock data, be sure to set the correct date and day of
the week. If a mistake is made — for example entering a value in the range 13
to 19 when entering the month — the buzzer sounds three times.
Make sure that the data is correct when the month changes.
S Numeral memory tables 247 to 255 are reserved for the clock function. Clock
data can be displayed and set during operation of the NT31/NT31C by using
these numeral memory tables.
S For details on the clock function, refer to 2-15-6 Clock Function in the Refer-
ence Manual.
S No clock data is set on shipment from the factory.
S The clock data is backed up by the built-in battery of the NT31/NT31C. If the
battery voltage becomes low, the clock data cannot be retained when the pow-
er to the NT31/NT31C is turned OFF or the NT31/NT31C is reset and the clock
function will not operate correctly.
S When writing to the screen data memory is disabled by the setting made for
System Setting in the System Installer mode, it is not possible to set the date
and time.