A
Appendix 03.04
B Terms
Load memory
For the CPU 314 of the -> PLC, the load memory is equal to the
working memory.
Look Ahead
With the look ahead function, a configurable number of traversing
blocks is read in advance in order to calculate the optimum machining
velocity.
Look-ahead detection of
contour violations
The control can recognize and signal the following types of collision:
1. The path distance is shorter than the tool radius.
2. The width of the inner corner is smaller than the tool diameter.
M
Macro technology
Grouping of a set of instructions under a single identifier. The identifier
in the program refers to the grouped set of instructions.
Machine
Control operating area
Machine axes
Axes which exist physically 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 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.
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.
MDA
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.
Siemens AG, 2004. All rights reserved.
A-154 SINUMERIK 840D/840Di/810D Operator’s Guide Handheld Terminal 6 (BAH) - 03.04 Edition
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