Horner APG XL6 OCS - Manual (Page 83)

MAN0883-05-EN CH.13
March 4, 2010 Page 83 of 135 #1037
Figure 13.7 – Example application segment for safe removal of removable media
13.10 Screen
Saver
The XL6/XL6e screen backlight life is typically 5 years when in continuous use. If the application does
not require interaction with the XL6/XL6e 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 that 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 XL6/XL6e. Any additional touch
activity is also ignored by the XL6/XL6e 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.
13.11 Screen
Brightness
The XL6/XL6e 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 that backlight life may be shorted when screen is dimmed or screen brightness is varied on a
repetitive basis.