Siemens SINUMERIK 840D sl Function Manual page 1073

Description of signals from channel to PLC
DB21, ...
DBX24.3 DRF selected
Edge evaluation: No
Signal state 1 or The operator has selected DRF on the operator panel front. The PLC program (basic PLC program
edge change 0 → 1 or user program) transfers this HMI interface signal to interface signal
DB21, ... DBB0.3 (activate DRF) once the corresponding logic operation has been performed.
As soon as DRF is active, the DRF offset can be changed in AUTOMATIC or MDA mode using the
handwheel assigned to the axis.
Signal state 0 or The operator has not selected DRF on the operator panel front.
edge change 1 → 0
Signal irrelevant for JOG mode
...
Corresponding to .... DB21, ... DBX0.3 (Activate DRF)
DB21, ...
DBX33.3 Handwheel override active
Edge evaluation: No
Signal state 1 or The function "Handwheel override in AUTOMATIC mode" is active for the programmed path axes.
edge change 0 → 1 Handwheel pulses of the 1st geometry axis function as a velocity override over the programmed
path feedrate.
Signal state 0 or The function "Handwheel override in AUTOMATIC mode" is not active for the programmed path
edge change 1 → 0 axes.
An active handwheel override is not active if:
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•
•
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Signal(s) updated: Cyclically
Signal(s) updated: Cyclically
the path axes have reached the target position.
The distance-to-go is deleted by the channel-specific interface signal
DB21, ... DBX6.2 (delete distance-to-go).
a RESET is performed.
NC/PLC Interface Signals (Z2)
Manual and handwheel travel
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