Command Axes; Plc Axes; Link Axes - Siemens SINUMERIK 840Di sl Programming Manual

Fundamental Geometrical Principles
1.4 Axes
1.4.9

Command axes

Command axes are started from synchronized actions in response to an event (command).
They can be positioned, started, and stopped fully asynchronous to the parts program. An
axis cannot be moved from the parts program and from synchronized actions
simultaneously.
Command axes are interpolated separately, i.e., each command axis has its own axis
interpolator and its own feedrate.
References:/FBSY/, Synchronized Actions
1.4.10

PLC axes

PLC axes are traversed by the PLC via special function blocks in the basic program; their
movements can be asynchronous to all other axes. The traversing movements take place
independently of path and synchronized movements..
1.4.11

Link axes

Link axes are axes, which are physically connected to another NCU and whose position is
controlled from this NCU. Link axes can be assigned dynamically to channels of another
NCU. Link axes are not local axes from the perspective of a particular NCU.
The axis container concept is used for the dynamic modification of the assignment to an
NCU. Axis substitution with GET and RELEASE from the parts program is not available for
link axes.
40
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Fundamentals