Positioning Axes - Siemens SINUMERIK 828D Programming Manual

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15.1 Axes
15.1.7

Positioning axes

Positioning axes are interpolated separately; in other words, each positioning axis has its
own axis interpolator and its own feedrate. Positioning axes do not interpolate with the path
axes.
Positioning axes are traversed by the NC program or the PLC. If an axis is to be traversed
simultaneously by the NC program and the PLC, an error message appears.
Typical positioning axes are:
● Loaders for moving workpieces to machine
● Loaders for moving workpieces away from machine
● Tool magazine/turret
Types
A distinction is made between positioning axes with synchronization at the block end or over
several blocks.
POS axes
Block change occurs at the end of the block when all the path and positioning axes
programmed in this block have reached their programmed end point.
POSA axes
The movement of these positioning axes can extend over several blocks.
POSP axes
The movement of these positioning axes for approaching the end position takes place in
sections.
Note
Positioning axes become synchronized axes if they are traversed without the special
POS/POSA identifier.
Continuous-path mode (G64) for path axes is only possible if the positioning axes (POS)
reach their final position before the path axes.
Path axes programmed with
duration of this block.
For more information about
POSA, POSP, FA, WAITP, WAITMC) (Page 120)".
440
/ are removed from the path axis grouping for the
POS POSA
, , and , see "Traversing positioning axes (POS,
POS POSA POSP
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
Fundamentals