Siemens SINUMERIK 840D sl Function Manual page 1109

Machine axes
Physically existent axes on the machine tool.
Machine control panel
An operator panel on a machine tool with operating elements such as keys, rotary switches,
etc., and simple indicators such as LEDs. It is used to directly influence the machine tool via
the PLC.
Machine coordinate system
A coordinate system, which is related to the axes of the machine tool.
Machine zero
Fixed point of the machine tool to which all (derived) measuring systems can be traced back.
Machining channel
A channel structure can be used to shorten idle times by means of parallel motion
sequences, e.g. moving a loading gantry simultaneously with machining. Here, a CNC
channel must be regarded as a separate CNC control system with decoding, block
preparation and interpolation.
Macro techniques
Grouping of a set of statements under a single identifier. The identifier represents the set of
consolidated statements in the program.
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.
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Glossary
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