Siemens SINUMERIK 840D sl Programming Manual page 400

Supplementary commands
14.5 Fixed-point approach (G75, G751)
Axis/Spindle movements with POSA/SPOSA
If programmed axes/spindles were previously traversed with POSA or SPOSA, these
movements will be completed first before the fixed point is approached.
Spindle functions in the G75/G751 block
If the spindle is excluded from "Fixed-point approach", then additional spindle functions (e.g.
positioning with SPOS/SPOSA) can be programmed in the G75/G751 block.
Modulo axes
In the case of modulo axes, the fixed point is approached along the shortest distance.
References
For further information about "Fixed-point approach", see:
Function Manual, Extended Functions; Manual and Handwheel Travel (H1), Chapter: "Fixed-
point approach in JOG"
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Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals