Siemens SINUMERIK 840D Function Manual page 738

S1: Spindles
18.2 Operating modes
MD35040 $MA_SPIND_ACTIVE_AFTER_RESET (individual spindle reset)
Value
0
1
If prior to reset or end of program the constant cutting speed (G96, G961) is active, the current
spindle speed (in relation to 100% spindle override) is internally accepted as the spindle speed
last programmed.
The spindle can only be stopped with the NC/PLC interface signal:
DB31, ... DBX2.2 (delete distance-to-go / spindle reset)
The direction of rotation is deleted in the event of all alarms generating a spindle quick stop. The
last programmed spindle speed (S value) is retained. Once the source of the alarm has been
eliminated, the spindle must be restarted.
Spindle actual speed display and spindle behavior with G96, G961
DB31, ... DBX61.4 (axis/spindle stationary)
The speed at which the spindle is deemed to be "stationary" is set with the machine data:
MD36060 $MA_STANDSTILL_VELO_TOL
The value should be measured in such a way that the following NC/PLC interface signal is
reliably present at a standstill:
DB31,... DBX61.4 (axis/spindle stationary)
If DB31,... DBX61.4 (axis/spindle stationary) is signaled and there is no closed-loop position
control active for the spindle, an actual speed of zero is displayed at the operator interface, and
zero is read with the system variable $AA_S[<n>].
Spindle response at constant cutting speed G96, G961
● At the start of machining (transition from G0 to Gx) and after NC stop, G60 (exact stop,
modal) and G9 (exact stop, non-modal) the system waits until the actual speed has reached
the speed setpoint tolerance range before starting the path.
DB31, ... DBX83.5 (nact = nset)
● The NC/PLC IS:
DB31, ... DBX83.5 (nact = nset)
and
DB31, ... DBX83.1 (setpoint speed limited) are also set to defined values
even if significant speed changes are specified (transverse axis travels towards position 0).
738
Meaning
When the spindle is reset or at the end of the program, the spindle immediately decelerates to
a stop at the active acceleration rate. The last programmed spindle speed and direction of
rotation are deleted.
Upon reset or at the end of the program, the last programmed spindle speed (S-value) and the
last programmed direction of spindle rotation (M3, M4, M5) are retained. The spindle is not
braked.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA