F1: Travel to fixed stop
6.3 Travel to fixed stop
Basic Functions
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Function Manual, 09/2011, 6FC5397-0BP40-2BA0
6.3
Travel to fixed stop
Preconditions
The functions "Travel to fixed stop" ad "Force Control" can only be activated for PROFIBUS drives that support a
SINAMICS-compatible telegram structure. Please observe the notes in the SINUMERIK 840Di Manual in the
chapter "Extended telegram configuration".
Selection
The NC detects that that function "Travel to fixed stop" is selected (using the command
FXS[x]=1
and signals
the PLC using the interface signal DB31, ... DBX62.4 ("Activate travel to fixed stop") that the function has been
selected.
The axis now traverses to the target position at the programmed velocity. At the same time, the clamping torque
(specified via
FXST[x]
) is transferred to the drive via the interface, and this limits its effective torque. In addition,
the acceleration is reduced accordingly in the NC automatically acc. to
FXST[x]
).
Fixed stop reached
As soon as the axis reaches the fixed stop, the axial contour deviation increases.
If the threshold entered in the machine data:
MD37030 FIXED_STOP_THRESHOLD
is exceeded or the IS signal DB31, ... DBX1.2 ("Sensor fixed stop") is set, then the control identifies that the fixed
stop has been reached.
The NC will then delete the distance to go and will synchronize the position setpoint to the current actual position
value. The controller enabling command remains active.
Then the NC issues IS DB31, ... DBX62.5 ("Fixed stop reached") to the PLC.
Then a block change is executed. The clamping torque continues to be applied.
