Siemens SINUMERIK 840D Function Manual page 93

Changes to the torque limiting (FXST)
The torque limit value can be changed in each block. The change becomes effective before
executing the traversing motion programmed in the block. The torque limitation acts in addition
to the acceleration limitation (ACC).
Ramp-shaped change
A time can be set using the machine data, within which the torque limit value is linearly changed:
MD37012 $MA_FIXED_STOP_TORQUE_RAMP_TIME (time until the new torque limit is
reached)
Changes to the monitoring window (FXSW)
The monitoring window can be changed in each block. The change becomes effective before
executing the traversing motion programmed in the block.
When the monitoring window is changed, not only does the window width change, but also the
reference point of the window to the actual axis position.
"Travel to fixed stop" when the continuous-path mode is active (G64)
The following machine data can be used to set that with the selection of the (FXS) function
during active continuous-path mode (G64), no exact stop is triggered at the block change (G60):
MD37060 $MA_FIXED_STOP_ACKN_MASK (monitoring PLC acknowledgements for travel to
fixed stop)
Bit
0
Boundary conditions
● The traversing motion to the fixed stop can be programmed as a path- or block-related or
modal positioning axis motion.
● Travel to fixed stop can be selected for several machine axes simultaneously.
● For a machine axis, which is traversed to a fixed stop, it is not permissible that
transformation, coupling and frame functions are active:
● The travel path and the activation of the function must be programmed in one block in the
part program.
● If "Travel to fixed stop" is activated via synchronized actions, the travel path and the
activation of the function can be programmed in separate blocks.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
Value Meaning
0 Start of the traversing motion without acknowledgement by the PLC
1 Start of the traversing motion after acknowledgement by the PLC
F1: Travel to fixed stop
3.2 Detailed description
93