Siemens SINUMERIK 840D sl Function Manual page 488

Kinematic Transformation (M1)
7.2 TRANSMIT
The following machine data must be set for a maximum of 2 of these TRANSMIT
transformations:
MD24950 $MC_TRANSMIT_ROT_AX_OFFSET_t
MD24910 $MC_TRANSMIT_ROT_SIGN_IS_PLUS_t
MD24920 $MC_TRANSMIT_BASE_TOOL_t
MD24911 $MC_TRANSMIT_POLE_SIDE_FIX_t
In this case, t specifies the number of the declared TRANSMIT transformation (maximum
of 2).
Figure 7-2
The configurations highlighted in the figure above apply when TRANSMIT is active.
488
Axis configuration for the example in the figure "Face-end machining of turned part"
(TRANSMIT)
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions