Siemens SINUMERIK 840D sl Function Manual page 1733

Figure 2-1
The various spindle speed limits are illustrated in the figure above. For more information and
for information on the effect of the setting data see:
References:
/FB1/ Function Manual Basic Functions; Spindles (S1);
Section: Spindle Monitoring Functions, Setting Data
Master spindle switchover with G96, G961
If the master spindle is switched over when G96, G961 are active, the speed of the former
master spindle is retained. This corresponds to a transition from G96 to G97. The master
spindle newly defined with SETMS executes the "Constant cutting rate" function generated in
this way.
Basic logic functions: Feeds (V1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Spindle speed limitations
Detailed description
2.1 Path feedrate F
17