MAN1106-07-EN_XL+_UserManual
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14.10 Screen Saver
The XL+ screen backlight life is typically five (5) years when in continuous use. If the
application does not require interaction with the XL+ for long periods of time, the backlight
life can be extended by using the screen saver function. When enabled through the System
Menu, the backlight is shut off (screen goes black) after a specified time of no-touch activity
on the screen. When the screen saver shuts off the backlight, any operator touch on the
screen or reactivates the backlight.
NOTE: When the screen saver is active (backlight shut off), any initial touch activity on the
screen to reactivate the backlight is otherwise ignored by the XL+. Any additional touch
activity is also ignored by the XL+ for approximately one second thereafter.
It is possible for the application to temporarily disable the screen saver by generating a
positive transition to %SR57.16 (coil only) at a rate faster than the screen saver timeout
value. This may be desired while waiting for alarm acknowledgement.
14.11 Screen Brightness
The XL+ provides a feature that allows screen dimming for night operation. To enable this
feature, the application must access and control system register %SR57 (Display Backlight
Brightness). Screen brightness is continuously variable by driving %SR57 through the range
of 100 (full bright) to 0 (full off). It is left to the screen designer on how to present a Screen
Brightness control to the user, if required.
NOTE: The backlight life can be extended by dimming or powering off the backlight.
