Siemens Sinumerik 840D sl Programming Manual page 208

Glossary
programmable function keys (softkeys) are assigned to certain functions that are defined via
the software.
Software limit switch
The limits of the traversing range of an axis is defined with software limit switches and this
prevents the carriage from coming in contact with the hardware limit switches. Two pairs of
values can be assigned per axis, and these can be activated separately via the -> PLC.
Speed limitation
Maximum/minimum (spindle) speed: The maximum spindle speed is limited by the values
that are specified either in the machine data by the-> PLC or the -> setting data.
Spindles
The spindle functionality is a construct with two levels:
Spindles: Speed or position-controlled spindle drives, analog digital (SINUMERIK 840D)
Auxiliary spindles: Speed-controlled spindle drives without encoder, e.g. for power tools.
Spline interpolation
The control system can generate a smooth curve with spline interpolation, for which a small
number of interpolation points are necessary along a programmed contour.
Standard cycles
Standard cycles are used to program DO operations that are repeated frequently:
● for drilling/milling
● for measuring tools and workpiece
The available cycles are listed in the "Cycle support" menu in the "Program" operating area.
The required parameters for the assignment of the values are displayed in plain text after the
desired execution cycle has been selected.
Station number
The station number represents the "contact address" of a -> CPU or a -> programming
device or any other intelligent I/O module if these communicate with each other via a ->
network. The station number is assigned to the CPU or the programming device with the S7
tool -> "S7 configuration".
Subblock
Block preceded by "N" containing information about a machining step, e.g. a positional data.
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Programming Manual, 06/09, 6FC5398-7BP10-1BA0
ISO Milling