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6-11SectionSystem Maintenance
191
6-11 System Maintenance
The NT31/NT31C has the following maintenance and check functions.
Item Function Page
I/O Settings Adjustment of display panel contrast and brightness of the backlight. Page 191
Calendar Check Display and setting of the time data of the NT31/NT31C clock function. Page 195
PT Settings
Direct connection setting of the screen data in the NT31/NT31C and display of the
setting statuses of the serial ports.
Page 197
Display history record Display and printing of display history record data. Page 198
Alarm history record Display and printing of alarm history record data. Page 200
Screen data check Display of each screen stored in the NT31/NT31C. Page 202
I/O
Device check Checking of the I/O functions of the NT31/NT31C. Page 205
I/O
check
I/F check Checking of the communication functions of the NT31/NT31C. Page 215
This section describes how to use these functions.
6-11-1 I/O Settings
This function is used to adjust the contrast of the display panel and the bright-
ness of the backlight.
With the NT31/31C, you can adjust the contrast and brightness settings using
either of the following two methods.
Setting from the System Menu
Adjusting the contrast: Select System Menu/Maintenance Mode/I/O Settings/
Contrast Adjust.
Adjusting the brightness: Select System Menu/Maintenance Mode/I/O Settings/
Brightness Adjust.
Setting Using Special Screen During PT Operation
You can set the brightness and contrast by displaying the screen with the follow-
ing number, using a touch switch with a switch screen function, or by specifying
the display screen in the PT status control area.
Screen number 9030: Brightness and contrast adjustment screen.
The NT31/NT31C allows the contrast to be adjusted in 100 steps. The CON-
TRAST ADJUST screen enables you to make the adjustment while actually
checking the contrast on the screen. Once the contrast has been set, it remains
in effect even if the power is turned OFF or the NT31/NT31C is reset (and even if
the voltage of the built-in battery becomes low).
Contrast Adjustment