Siemens SINUMERIK 840Di sl Programming Manual page 285

Example, spindle positioning in the axis mode
...
N10 M3 S500
...
N90 SPOS[2]=0 or
M2=70
N100 X50 C180
N110 Z20 SPOS[2]=90
Example of drilling cross holes in turned part
Cross holes are to be drilled in this turned part. The running drive spindle (master spindle) is
stopped at zero degrees and then successively turned through 90°, stopped and so on.
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
7.4 Positioning spindles (SPOS, M19 and SPOSA, WAITS)
;Position control on, spindle 2 positioned to 0, axis mode
;can be used in the next block.
;Spindle 2 is switched to axis mode
;Spindle 2 (C axis) is traversed with linear interpolation
;synchronous to X.
;Spindle 2 is positioned to 90 degrees.
Feedrate Control and Spindle Motion
285