Siemens SINUMERIK 840DE Programming Manual page 488

Glossary
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 control the machine tool directly via
the PLC.
Machine coordinate system
System of coordinates based on the axes of the machine tool.
Machine zero
A fixed point on the machine tool, which can be referenced by all (derived) measuring
systems.
Machining channel
Via a channel structure, parallel sequences of movements, such as positioning a loading
gantry during machining, can shorten unproductive times. 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 instructions under a single identifier. The identifier in the program refers
to the grouped set of instructions.
Main block
A block prefixed by ":" containing all the parameters required to start execution of a -> parts
program.
Main program
Parts program identified by a number or identifier, in which further main programs,
subroutines or -> cycles may be called.
MDI
Control operating mode: Manual Data Automatic. In MDA mode, it is possible to enter
individual program blocks or sequences of blocks without reference to a main program or
subroutine and to then execute them immediately via the NC start key.
Measuring circuits
SINUMERIK 840D: The position encoder evaluation is located in the SIMODRIVE 611D-
drive modules. The maximum configuration is 8 axes and spindles in total, with up to 5
spindles.
Glossary-12
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals