Siemens SINUMERIK 828D Function Manual page 1621

DB19
DBX20.1 Screen dark
Signal state 0 or The screen is not darkened.
edge change 1 → 0
Application Using this IS, the PLC can identify whether the screen was switched dark using the interface signal:
example(s) DB19, DBX0.1 (darken screen)
or using the machine data:
MD9006 $MM_DISPLAY_BLACK_TIME (screen blanking time)
.
Corresponding to ... MD9006 $MM_DISPLAY_BLACK_TIME (screen blanking time)
DB19
DBX20.3 Cancel alarm cleared
Edge evaluation: No
Signal state 1 or Cancel alarm deleted active
edge change 0 → 1
Signal state 0 or Cancel alarm deleted inactive
edge change 1 → 0
Note: The signal is not reset automatically, it must be set by the user via the PLC user program.
Application Applies only to HMI Advanced
example(s)
DB19
DBX20.4 Recall alarm cleared
Edge evaluation: No
Signal state 1 or Recall alarm deleted inactive
edge change 0 → 1
Signal state 0 or Recall alarm deleted inactive
edge change 1 → 0
Note: The signal is not reset automatically, it must be set by the user via the PLC user program.
Application Applies only to HMI Advanced
example(s)
DB19
DBX20.6 Simulation active
Edge evaluation: No
Signal state 1 or On entry to simulation = 1
edge change 0 → 1
Signal state 0 or On exit from simulation = 0
edge change 1 → 0
Application Can be evaluated by machine manufacturer in order to activate the test on NC start.
example(s) The following must be set in the drive machine data:
MD1012 $MD_FUNC_SWITCH, bit 2 = 0.
Status "Ext. pulse disable active, terminal 663 open" is then not transmitted to the NC.
Corresponding to ... MD1012 $MD_FUNC_SWITCH, bit 2
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Signal(s) updated: Cyclic
Signal(s) updated: Cyclic
Signal(s) updated: Cyclic
Z1: NC/PLC interface signals
19.1 Various interface signals and functions (A2)
1621