Siemens SINUMERIK 840D sl Function Manual page 152

Several Operator Panels on Several NCUs, Distributed Systems (B3)
Link axes
Revolutional feedrate
Setting data SD43300 SA_ASSIGN_FEED_PER_REV_SOURCE refers to the logical
machine axis image and then via this to a machine axis (local or link axis).
2.6.5 Programming with channel and machine axis identifiers
Channel axis identifier
Example:
WHENEVER $AA_IW[Z] < 10 DO ...;Current position of Z axis
Machine axis identifier
Example:
WHENEVER $AA_IW[AX3] < 10 DO ...;Scan current position of machine axis AX3
This method of programming is permitted only if machine axis AX3 is known in the channel
at the time of scanning.
Note
System variables which can be used in conjunction with channel axis identifiers are specially
marked in the Advanced Programming Manual (Appendix).
2.6.6 Flexible configuration
Introduction
Rotary indexing machines and multi-spindle machines have special requirements as regards
the flexible assignment of channel axes to machine axes.
Requirement profile
When advancing the table of the rotary indexing machine or the drum of the multi-spindle
machines, the axes/spindles are brought to a new station or position. The NCU which
controls the axes of a station as local axes must be able to address the newly changed
axes/spindles. The hitherto addressable axes/spindles can now be discarded for this
purpose.
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Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions