Selectable Spindles - Siemens SINUMERIK 840D Function Manual

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18.6

Selectable spindles

Function
Regarding channel spindles, the "Switchable spindles" function allows general NC programs to
be written, which can be used in different channels. The logical spindle number used in the NC
program is converted to the physical spindle number using a spindle number converter. This
means for the same spindle number programmed in the NC program, different physical
spindles (machine axes) can be traversed in different channels.
The physical spindles loaded or unloaded by "axis replacement" no longer have to be specified
explicitly in the part program.
Machine data
Physical spindle number
Each spindle must be assigned to a machine axes using a unique configurable number, the
physical spindle number:
MD35000 $MA_SPIND_ASSIGN_TO_MACHAX[<machine axis>] = <physical spindle
number>
Activation of the spindle number converter
The spindle number converter is activated on a channel-for-channel basis using machine data:
MD20092 $MC_SPIND_ASSIGN_TAB_ENABLE = TRUE
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
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Deactivating the axis-specific NC/PLC interface signal DB31, ... DBX17.6 (invert M3/M4) to
reverse the direction of rotation of the spindle for tapping without compensating check
(G331, G332).
0 Interface signal DB31, ... DBX17.6 active.
Note
● Standard case: The value of the interface signal is determined when the NC
program starts. When the interface signal subsequently changes, this has no
effect within the NC program.
● Special case: If a change to the interface signal must be taken into account while
the NC program is being executed, then this must be implemented as part of the
application engineering. See Chapter "Special case: Direction of rotation
reversal via NC/PLC interface signal in the NC program (Page 767)".
1 Interface signal DB31, ... DBX17.6 not active.
S1: Spindles
18.6 Selectable spindles
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