Siemens SINUMERIK 840D sl Function Manual page 350
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Detailed Description
2.1 General functionality
Changing the clamping torque and fixed stop monitoring window
The clamping torque and the monitoring window can be changed with the commands
FXST[x] and FXSW[x]. The changes take effect before traversing movements in the same
block.
Programming of a new fixed stop monitoring window causes a change not only in the
window width but also in the reference point for the center of the window if the axis has
moved prior to reprogramming. The actual position of the machine axis when the window is
changed is the new window center point.
Terminal 663 with MD37002 controllable
With the machine data:
MD37002 $MA_FIXED_STOP_CONTROL
the response in the case of pulse inhibit at the stop is controlled.
Deleting the pulses by terminal 663 or the "Pulse enable" IS DBX31, ...DBX21.7 will not
abort the function. As a result, the drive will press against the fixed stop again without any
further operating action when the machine is restarted.
The rise time of the torque corresponds to the time needed by the current controller of the
drive to reach the limitation again.
If the pulses are deleted when a deselection is active (waiting for PLC acknowledgments),
the torque limit will be reduced to zero. If the pulses are reactivated during this phase, torque
is no longer built up. Once the deselection has been completed, you can continue traversing
as normally.
FXS commands programmable in synchronized actions
The parts program commands FXS, FXST and FXSW can be programmed in synchronized
actions/technology cycles.
The function FXS[x]=1 can also be activated without movement; the torque is limited
immediately. As soon as the axis is moved via a setpoint, the limit stop monitor is activated.
In static and blockrelated synchronized actions, the same commands FXS, FXST, FXSW can
be used as in the normal parts program run. The values assigned can result from a
calculation.
Ramp for torque limitation with MD37012
A ramp has been implemented so that the setting of a torque limit is not to jerky.
For this in the machine data:
MD37012 $MA_FIXED_STOP_TORQUE_RAMP_TIME
defining the length of the ramp until the new torque limit is reached.
14
Basic logic functions: Travel to fixed stop (F1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
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