Siemens SINUMERIK 840D sl Function Manual page 343

Local position of gear unit/encoder
Figure 7-2
Motor/load gear
The motor/load gear supported by SINUMERIK is configured via the following machine data:
MD31060 $MA_DRIVE_AX_RATIO_NUMERA (numerator load gearbox)
MD31050 $MA_DRIVE_AX_RATIO_DENOM (denominator load gearbox)
The transmission ratio is obtained from the numerator/denominator ratio of both machine data.
The associated parameter sets are used automatically as default by the controller to
synchronize the position controller with the relevant transmission ratios.
Since a gear stage change is not always carried out automatically, and there are also several
ways to request a gear stage change, the position controller is not always incorporated via
parameter sets.
Note
For further information about the parameter sets for gear stage change, see Section "S1:
Spindles (Page 1199)".
Intermediate gear
Additional, configurable load intermediate gears are also supported by the controller:
MD31066 $MA_DRIVE_AX_RATIO2_NUMERA (intermediate gear numerator)
MD31064 $MA_DRIVE_AX_RATIO2_DENOM (intermediate gear denominator)
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
G2: Velocities, setpoint / actual value systems, closed-loop control
Gear unit types and encoder locations
7.4 Setpoint/actual-value system
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