MAN0974-14-EN_XL7_XL7P_UM
July 6, 2022
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14.11 Screen Saver
The XL7/XL7 PRIME screen backlight life is typically five (5) years when in continuous use. If the
application does not require interaction with the XL7/XL7 PRIME 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 XL7/XL7 PRIME. Any additional
touch activity is also ignored by the XL7/XL7 PRIME 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 XL7/XL7 PRIME 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.