MAN0964-13-EN_XL4_UM
A u g u s t 6 , 2 0 2 1 P a g e 142 | 194
14.11 Screen Saver
The XL4 screen backlight life is typically five (5) years when in continuous use. If the application
does not require interaction with the XL4 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 function
keys reactivates the backlight.
NOTE: When the screen saver is active (backlight shut off), any initial touch activity on the
screen (or function key) to reactivate the backlight is otherwise ignored by the XL4. Any
additional touch activity is also ignored by the XL4 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.
14.12 Screen Brightness
The XL4 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 if and how to present a Screen
Brightness control to the user.
NOTE: The backlight life can be extended by dimming or powering off the backlight.
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