Siemens sinumerik 840D sl Function Manual page 424

Detailed description
2.1 Function
Configuration
Setpoint exchange enables a number of axes to use the same drive.
The same setpoint channel on this drive is assigned a number of times to define the axes
participating in setpoint exchange. For this, the following machine data must be pre-assigned
with the same logical drive number for every axis:
MD30110 $MA_CTRLOUT_MODULE_NR (setpoint assignment: module number)
Note
Alarm 26018 is output if the option is missing.
The encoder assignment is programmed in machine data:
MD30230 $MA_ENC_INPUT_NR
(actual-value assignment: Input on drive module/measuring circuit module)
Figure 2-3
8
Setpoint exchange with 2 axes
Special functions: Setpoint Exchange (S9)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0