Siemens SINUMERIK 840Di Function Manual page 1560

Detailed Description
2.4 Selectable spindles
Functionality
Each spindle is uniquely mapped to a machine axis using a configurable number with
machine data:
MD35000 $MA_SPIND_ASSIGN_TO_MACHAX[AX...].
This number is always applies to a spindle, regardless of the channel in which the spindle is
actively handled.
The channel spindles can be switched over because an intermediate level is introduced
between the logical spindle numbers used in the part program and the physical spindles
existing in the channel.
The setting data table
(SD42800 $SC_SPIND_ASSIGN_TAB[...]; Spindle number converter)
assigns each logical spindle used in the part program a physical spindle.
The spindle number converter is effective in spindle programming by means of:
• The part program
• Synchronized actions
The spindle number converter has no effect with PLC commands, which use function block
FC18. The physical spindle must always be addressed there within the context of the axis.
The logical spindles can be changed by modifying the setting data:
SD42800 $SC_SPIND_ASSIGN_TAB[...].
The switchover can be initiated from the part program, from the PLC and/or from the MMC.
Note
In setting data:
SD42800 $SC_SPIND_ASSIGN_TAB[0]
contains the logical master spindle.
It is only used for display purposes.
This setting data is defined in the part program by SETMS (logical spindle).
Unused spindles are assigned the value 0 in SD42800.
System variables affected by the spindle mapping table are:
$P_S, $P_SDIR, $P_SMODE, $P_GWPS, $AC_SDIR, §AC_SMODE, $AC_MSNUM, $AA_S.
References:
/PGA/ Programming Guide Advanced
The converted, physical spindle number is always output as the address extension in the
auxiliary function output.
Supplementary conditions
• Switchable channel spindles are not a substitute for the "Axis replacement" function.
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Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Spindles (S1)