Siemens SINUMERIK 840D Function Manual page 96

F1: Travel to fixed stop
3.2 Detailed description
Monitoring window
If, in the traversing block to the fixed stop or since the beginning of the program, no specific
value for the monitoring window is programmed with FXSW then the value set in the machine
data is active:
MD37020 $MA_FIXED_STOP_WINDOW_DEF (default for fixed stop monitoring window)
If the axis leaves the position it was in when the fixed stop was detected by more than the
specified window, then alarm 20093 "Fixed stop monitoring has responded" is displayed and
the "Travel to fixed stop" function is deselected.
The monitoring window must be selected by the user such that the alarm is activated only when
the axis leaves the fixed stop position.
NOTICE
"Fixed stop reached" and when the fixed stop breaks
As soon as the "fixed stop reached" state is identified, then a speed setpoint derived from the
axis-specific machine data servo gain factor (K
stop detection (MD37030) is entered for the drive. If the fixed stop breaks in this state, then the
axis accelerates until it reaches the monitoring window limit. The velocity that is then reached
is proportional to the values set in the specified machine data. For appropriately high values,
it is possible that the drive accelerates up to the maximum motor speed.
96
) (MD32200) and the threshold for the fixed
V
Function Manual, 06/2019, A5E47437747B AA
Axes and spindles