Siemens SINUMERIK 840D sl Programming Manual page 928

Glossary
Metric measuring system
Standardized system of units: For length, e.g. mm (millimeters), m (meters).
Mirroring
Mirroring reverses the signs of the coordinate values of a contour, with respect to an axis. It
is possible to mirror with respect to more than one axis at a time.
Mode group
Axes and spindles that are technologically related can be combined into one mode group.
Axes/spindles of a BAG can be controlled by one or more → channels. The same → mode
type is always assigned to the channels of the mode group.
Mode of operation
An operating concept on a SINUMERIK control. The following modes are defined: → Jog,
→ MDA, → Automatic.
NC
Numerical Control: Numerical control (NC) includes all components of machine tool control:
→ NCK, → PLC, HMI, → COM.
Note
A more correct term for SINUMERIK 840D controls would be: Computerized Numerical
Control
NCK
Numerical Control Kernel: Component of NC that executes the → part programs and
basically coordinates the motion operations for the machine tool.
Network
A network is the connection of multiple S7-300 and other end devices, e.g. a programming
device via a → connecting cable. A data exchange takes place over the network between the
connected devices.
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Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
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