Siemens SINUMERIK 840D sl Function Manual page 1110

Glossary
Messages
All messages programmed in the part program and → alarms detected by the system are
displayed on the operator panel in plain text with date and time and the corresponding
symbol for the cancel criterion. Alarms and messages are displayed separately.
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.
1110
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions