Siemens SINUMERIK 840D sl Function Manual page 1661

DB21, ...
DBX24.6 Dry run feedrate selected
Edge evaluation: No
Signal state 1 or Dry run feedrate is selected.
edge change
Instead of the programmed feedrate, the dry run feedrate entered in setting data:
0 → 1
SD42100 $SC_DRY_RUN_FEED
is active.
When activated from the operator panel, the dry run feed signal is automatically entered in the PLC
interface and transmitted by the PLC basic program to the PLC interface signal:
DB21, ... DBX0.6 (active dry run feed).
Signal state 0 or Dry run feedrate is not selected.
edge change
The programmed feedrate is active.
1 → 0
Corresponding to ... DB21, ... DBX0.6 (activate dry run feed)
SD42100 $SC_DRY_RUN_FEED (dry run feedrate)
DB21, ...
DBX25.3 Feedrate override selected for rapid traverse
Edge evaluation: No
Signal state 1 or The feedrate override switch should also be active as rapid traverse override switch.
edge change
Override values above 100% are limited to the maximum value for 100% rapid traverse override.
0 → 1
The interface signal:
DB21, ... DBX25.3 (feedrate override for rapid traverse selected)
is automatically entered into the PLC interface from the operator panel
and transferred from the PLC basic program to the PLC interface signal:
DB21, ... DBX6.6 (rapid traverse override active).
Further, the interface signal:
DB21, ... DBB4 (feedrate override)
is copied from the PLC basic program to the interface signal:
DB21, ... DBB5 (rapid traverse override).
Signal state 0 or The feedrate override switch should not be activated as rapid traverse override switch.
edge change
1 → 0
Application exam‐ The signal is used when no separate rapid traverse override switch is available.
ple(s)
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Signal(s) updated: Cyclically
Signal(s) updated: Cyclically
Z1: NC/PLC interface signals
19.12 Feeds (V1)
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