Siemens SINUMERIK 840D sl Programming Manual page 128

Feed control
7.4 Positioning spindles (SPOS, SPOSA, M19, M70, WAITS)
Examples
Example 1: Position spindle with negative direction of rotation
Spindle 2 is to be positioned at 250° with negative direction of rotation:
Program code
N10 SPOSA[2]=ACN(250)
Example 2: Spindle positioning in axis mode
128
Comment
; The spindle is decelerated if necessary and
accelerated in the opposite direction to that of the
positioning movement.
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals