MAN0878-09-EN_XLE_XLT_UserManual
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13.6 Screen Saver
The XLE/XLT screen backlight life remains sufficiently bright for five (5) years. It will dim to
70% brightness if it is left on continuously for five (5) years. If the application does not
require interaction with the OCS 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 activity on the screen. When the screen
saver shuts off the backlight, any key or button reactivates the backlight.
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.
NOTE: The backlight life can be extended by dimming or powering off the backlight.
13.7 Screen Brightness
The XLT 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: Only the XLT offers a screen dimming function.
NOTE: The backlight life can be extended by dimming or powering off the backlight.