Siemens SINUMERIK 840Di Function Manual page 415

Note
These machine data are not required for encoder matching (path evaluation).
However, they must be entered correctly for the setpoint calculation!
Otherwise the required servo gain (K
Load revolutions are entered in machine data:
MD31050 $MA_DRIVE_AX_RATIO_DENOM
and motor revolutions in machine data:
MD31060 $MA_DRIVE_AX_RATIO_NUMERA.
Coding of the machine data
The indices of the following machine data are encoder-coded [encoder no.]:
encoder 0 or 1
Encoder-dependent machine data
MD31070 $MA_DRIVE_ENC_RATIO_DENOM[n]
MD31080 $MA_DRIVE_ENC_RATIO_NUMERA[n]
MD31000 $MA_ENC_IS_LINEAR[n]
MD31010 $MA_ENC_GRID_POINT_DIST[n]
MD31020 $MA_ENC_RESOL[n]
MD31040 $MA_ENC_IS_DIRECT[n]
MD34320 $MA_ENC_INVERS[n]
Further machine data without index
MD30200 $MA_NUM_ENCS
MD30300 $MA_IS_ROT_AX
MD31030 $MA_LEADSCREW_PITCH
Index [n] of the following machine data depend on the servo parameter sets of the position
controller, with which the actual-value resolution is calculated automatically in the control:
MD DRIVE_AX_...[servo parameter set no.] : 0-5
Parameter-set-dependent machine data
MD31050 $MA_DRIVE_AX_RATIO_DENOM[n]
MD31060 $MA_DRIVE_AX_RATIO_NUMERA[n]
Velocities, Setpoint/Actual-Value Systems, Closed-Loop Control (G2)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
) factor will not be set.
V
Meaning
(Measuring gear denominator)
(Measuring gear numerator)
(Direct measuring system, linear scale)
(Distance between reference marks on
linear scales)
(Encoder pulses per revolution)
for rotary encoder
(Encoder is connected directly at the
machine)
(Length measurement system is inverse)
(Number of encoders)
(Rotary axis)
(Leadscrew pitch)
Meaning
(Denominator load gear unit)
(Numerator load gear unit)
Detailed Description
2.3 Setpoint/actual-value system
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