Siemens SINUMERIK 840D sl Function Manual page 476

Mode Groups, Channels, Axis Replacement (K5)
6.4 Axis/spindle replacement
State transitions GET, RELEASE from synchronous actions and when GET is completed
Figure 6-8 Transitions from synchronized actions
For more information, please refer to:
References:
/FBSY/ Function Manual, Synchronous Actions; "Actions in Synchronous Actions"
/PGA/ Programming Manual, Work Preparation; "Motion-synchronous Actions"
476
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions