A2: Various NC/PLC interface signals and functions
1.2 NC/PLC interface signals
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
39
DB21, ... DBX36.6 (channelspecific NCK alarm pending)
The NC sends this signal to the PLC to indicate that at least one NC alarm is pending for the affected channel.
See also:
DB21, ... DBX36.7 (NCK alarm with processing stop present)
DB21, ... DBX36.7 (NCK alarm with processing stop present)
The NC sends this signal to the PLC to indicate that at least one NCK alarm, which has interrupted or aborted the
current program run (processing stop), is pending for the affected channel.
1.2.4
Signals to/from panel front
DB19 DBX0.0 (screen bright)
The screen blanking is disabled.
DB19 DBX0.1 (screen dark)
The operator panel screen is darkened.
If the interface signal is used to actively darken the screen:
• It is no longer possible to switch the screen bright again on the keyboard (see below).
• The first keystroke on the operator panel front already triggers an operator action.
Screen darkening via keyboard/automatic screen saver
If no buttons are pressed on the operator panel front within the assigned time (default = 3 minutes):
MD9006 $MM_DISPLAY_BLACK_TIME
(time for screen darkening), the screen is automatically darkened.
The screen lights up again the first time a button is pressed following darkening. Pressing a button to lighten the
screen will not generate an operator action.
Parameter assignment:
DB19 DBX0.1 = 0
MD9006 $MM_DISPLAY_BLACK_TIME > 0
DB19 DBX0.2 (key disable)
All inputs via the connected keyboard are inhibited.
Note
In order to prevent accidental operator actions when the screen is darkened via the
interface signal, we recommend disabling the keyboard at the same time.
DB19 DBX0.1 = 1 AND DB19 DBX0.2 = 1 (key disable)
