Synchronized Axes; Command Axes; Plc Axes - Siemens SINUMERIK 840D sl Programming Manual

15.1.8

Synchronized axes

Synchronized axes traverse synchronously to the path from the start position to the
programmed end position.
The feedrate programmed in F applies to all the path axes programmed in the block, but does
not apply to synchronized axes. Synchronized axes take the same time as the path axes to
traverse.
A synchronized axis can be a rotary axis, which is traversed synchronously to the path
interpolation.
15.1.9

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 part program and from synchronized actions simultaneously.
Command axes are interpolated separately; in other words, each command axis has its own
axis interpolator and its own feedrate.
References:
Function Manual, Synchronized Actions
15.1.10

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. Traversing movements take place
independently of path and synchronized movements.
Fundamentals
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Other information
15.1 Axes
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