Siemens SINUMERIK 840D sl Commissioning Manual page 224

Communication between the NC and the drive
7.5 Drives: Assign axis
to an axis. The following also applies to a setpoint assignment:
MD30130 $MA_CTRLOUT_TYPE[ ] = 1.
Selecting the assignment procedure
Select from the following procedures in the "Assignment Procedure" dialog:
● Via axis machine data (NC drive number)
The NC drive number is retained and written for the selected axis into the following axis
machine data:
MD30110 $MA_CTRL_OUT_MODULE_NR and MD30220 $MA_ENC_MODUL_NR
● Via general machine data (I/O address) = default setting
For this assignment procedure, the I/O address assigned to the drive using the NC drive
number is written to the following general machine
data: MD13050 $MN_DRIVE_LOGIC_ADDRESS[<NC drive number> - 1]. This assumes
that the I/O address default setting is not changed in the PLC project.
● User-defined
If you select this option, the selection list can be edited under "NC drive number". Then
assign a drive number and the displayed I/O address to the axis selected above. This option
is recommended only for experienced machine manufacturers!
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CNC Commissioning: NC, PLC, Drive
Commissioning Manual, 12/2019, A5E48312804B AA