Siemens SINUMERIK 840D sl Programming Manual page 132

Feed control
7.4 Positioning spindles (SPOS, SPOSA, M19, M70, WAITS)
Position spindle from rotation (M3/M4)
When M3 or M4 is active, the spindle comes to a standstill at the programmed value.
There is no difference between DC and AC dimensioning. In both cases, rotation continues in
the direction selected by M3/M4 until the absolute end position is reached. With ACN and ACP,
deceleration takes place if necessary, and the appropriate approach direction is taken. With
IC, the spindle rotates additionally to the specified value starting at the current spindle
position.
Position a spindle from standstill (M5)
The exact programmed distance is traversed from standstill (M5).
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Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals