Siemens Sinumerik 840D sl Programming Manual page 534

Glossary
R parameters
Arithmetic parameter that can be set or queried by the programmer of the → part program for
any purpose in the program.
Rapid traverse
The highest traverse rate of an axis. For example, rapid traverse is used when the tool
approaches the → workpiece contour from a resting position or when the tool is retracted from
the workpiece contour. The rapid traverse velocity is set on a machine-specific basis using a
machine data element.
Reference point
Machine tool position that the measuring system of the → machine axes references.
Rotary axis
Rotary axes apply a workpiece or tool rotation to a defined angular position.
Rotation
Component of a → frame that defines a rotation of the coordinate system around a particular
angle.
Rounding axis
Rounding axes rotate a workpiece or tool to an angular position corresponding to an indexing
grid. When a grid index is reached, the rounding axis is "in position".
RS-232-C
Serial interface for data input/output. Machining programs as well as manufacturer and user
data can be loaded and saved via this interface.
Safety functions
The controller is equipped with permanently active monitoring functions that detect faults in
the → CNC, the → PLC, and the machine in a timely manner so that damage to the workpiece,
tool, or machine is largely prevented. In the event of a fault, the machining operation is
interrupted and the drives stopped. The cause of the malfunction is logged and output as an
alarm. At the same time, the PLC is notified that a CNC alarm has been triggered.
Scaling
Component of a → frame that implements axis-specific scale modifications.
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Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
Fundamentals