Siemens SINUMERIK 840D Function Manual page 813

Example
Assignment, spindle number and machine axis:
MD35000 $MA_SPIND_ASSIGN_TO_MACHAX [AX4] = 1
MD35000 $MA_SPIND_ASSIGN_TO_MACHAX [AX5] = 2
MD35000 $MA_SPIND_ASSIGN_TO_MACHAX [AX6] = 3
MD35000 $MA_SPIND_ASSIGN_TO_MACHAX [AX7] = 5
Accepting a machine axis in a channel:
MD20070 $MC_AXCONF_MACHAX_USED[0] = 4
MD20070 $MC_AXCONF_MACHAX_USED[1] = 5
MD20070 $MC_AXCONF_MACHAX_USED[2] = 6
MD20070 $MC_AXCONF_MACHAX_USED[3] = 7
Specifying the master spindle:
MD20090 $MC_SPIND_DEF_MASTER_SPIND = 1
Spindle number converter
MD20092 $MC_SPIND_ASSIGN_TAB_EN-
ABLE=1
SD42800 $SC_SPIND_AS-
SIGN_TAB[0]=1
SD42800 $SC_SPIND_AS-
SIGN_TAB[1]=1
SD42800 $SC_SPIND_AS-
SIGN_TAB[2]=2
SD42800 $SC_SPIND_AS-
SIGN_TAB[3]=3
SD42800 $SC_SPIND_AS-
SIGN_TAB[4]=0
; Address extension is 1 output: M1=3 S1=1000
; Spindle 1 (physical master spindle) rotates
M3 S1000
...
; Assignment of logical spindle 1 to physical spindle 5
SD42800 $SC_SPIND_AS-
SIGN_TAB[1]=5
; Assignment of logical spindle 2 to physical spindle 3
SD42800 $SC_SPIND_AS-
SIGN_TAB[2]=3
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
; Activate spindle number converter
; Master spindle as configured
; Basic setting of the table
; Logical spindle not assigned
S1: Spindles
18.6 Selectable spindles
813