Siemens Sinumerik 840D sl Programming Manual page 138

Flexible NC programming
1.16 Transfer axis to another channel (AXTOCHAN)
Further information
AXTOCHAN in the NC program
A GET is only executed in the event of the axis being requested for the NC program in the
same channel (this means that the system waits for the state to actually change). If the axis is
requested for another channel or is to become the neutral axis in the same channel, the
request is sent accordingly.
AXTOCHAN from a synchronized action
In the event of an axis being requested for the same channel, AXTOCHAN from a synchronized
action is mapped to a GET from a synchronized action. In this case, the axis becomes the
neutral axis on the first request for the same channel. On the second request, the axis is
assigned to the NC program in the same way as the GET request in the NC program. For
more information about GET requests from a synchronized action, see "Motion-synchronous
actions".
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Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
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