Siemens SINUMERIK 840D sl Function Manual page 298

F1: Travel to fixed stop
6.2 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.
Overview
Figure 6-2
298
Fixed stop is reached
) (MD32200) and the threshold for the fixed
V
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions