Programming principles
1.2 Positional data
Turning Part 2: Programming (Siemens instructions)
Programming and Operating Manual, 05/2012, 6FC5398-5DP10-0BA0
25
Address Significance Value assignments Information Programming
STOPFIFO Stops the fast
machining step
Special function;
filling of the buffer memory until
STARTFIFO, "Buffer memory
full" or "End of program" is
detected.
STOPFIFO; separate
block, start of filling
N10 X...
N20 X...
STARTFIFO Start of fast
machining step
Special function;
the buffer memory is filled at the
same time.
N30 X...
STARTFIFO ;separate
block, end of filling
STOPRE Preprocessing
stop
Special function; the next block
is only decoded if the block
before STOPRE is completed.
STOPRE ; separate block
1.2 Positional data
1.2.1 Programming dimensions
In this section you will find descriptions of the commands, with which you can directly
program dimensions taken from a drawing. This has the advantage that no extensive
calculations have to be made for NC programming.
Note
The commands described in this section stand in most cases at the start of a NC program.
The way, in which these functions are combined, is not intended to be a patent remedy. For
example, the choice of working plane may be made at another point in the NC program. The
real purpose of this and the following sections is to illustrate the conventional structure of an
NC program.
Overview of typical dimensions
The basis of most NC programs is a drawing with concrete dimensions.
When implementing in a NC program, it is helpful to take over exactly the dimensions of a
workpiece drawing into the machining program. These can be:
● Absolute dimension, G90 modally effective applies for all axes in the block, up to
revocation by G91 in a following block.
● Absolute dimension, X=AC(value) only this value applies only for the stated axis and is
not influenced by G90/G91. This is possible for all axes and also for SPOS, SPOSA
spindle positionings, and interpolation parameters I, J, K.
● Absolute dimension, X=CC(value) directly approaching the position by the shortest route,
only this value applies only for the stated rotary axis and is not influenced by G90/G91.
This is also possible for SPOS, SPOSA spindle positionings.
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