Siemens SINUMERIK 840D sl Function Manual page 1097

Main block
A block prefixed by ":" introductory block, containing all the parameters required to start
execution of a -> part program.
Main program
The → part program designated by a number or an identifer in which additional main
programs, subroutines, or → cycles can be called.
MDA
Control operating mode: Manual Data Automatic. In the MDA mode, individual program
blocks or block sequences with no reference to a main program or subroutine can be input
and executed immediately afterwards through actuation of the NC start key.
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.
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Glossary
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