Detailed Description
2.1 Various interface signals and functions (A2)
Basic logic functions: NC/PLC interface signals (Z1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
13
DB19
DBX0.1
Darken screen
Edge evaluation: no Signal(s) updated: cyclic
Signal state 1 or
edge change 0 → 1
The screen is switched to "dark" by the PLC user program.
The automatic screen blanking function is therefore inactive:
i. e. the screen does not automatically become bright (blanking off) when a key on the keyboard is
pressed.
Signal state 0 or
edge change 1 → 0
The screen is switched to "bright" by the PLC user program.
With this signal status, screen blanking from the control can be automatically derived from the
keyboard.
If a key is not pressed on the keyboard for a time that is defined using machine data:
MD9006 $MM_DISPLAY_BLACK_TIME (time to blanken the screen),
then the screen is blanked.
The screen is switched to bright again (screen blanking off) the next time a key on the operator
panel is pressed.
Application
example(s)
Screen saver
Special cases,
errors, ....
Notice:
If the interface signal "Darken screen"
DB19, DBX0.1 (darken screen) = 1,
then the keyboard of the operator panel remains operational!
We therefore recommend that this is disabled using the interface signal:
DB19, DBX0.2) (key disable)
.
Corresponding to .... DB19, DBX0.2 (key disable)
MD9006 $MM_DISPLAY_BLACK_TIME (time to darken the screen)
DB19
DBX0.2
Key disable
Edge evaluation: no Signal(s) updated: cyclic
Signal state 1 or
edge change 0 → 1
The keyboard is disabled for the user.
Signal state 0 or
edge change 1 → 0
The keyboard is enabled for the user.
Application
example(s)
If the screen is blanked using the interface signal:
DB19, DBX0.1 (darken screen),
then, at the same time, the keyboard should be disabled using the interface signal:
DB19, DBX0.2 (key disable),
in order to prevent the operator from unintentionally entering keyboard commands.
Corresponding to .... DB19, DBX0.1 (darken screen)
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