Siemens SINUMERIK 840D Function Manual page 62

G2: Velocities, setpoint / actual value systems, closed-loop control
2.4 Setpoint/actual-value system
Machine data of the actual value resolution
The actual-value resolution results from the design of the machine, whether gearboxes are
available and their gear ratio, the leadscrew pitch for linear axes and the resolution of the
encoder being used. The following machine data must be set for this on the control system:
Encoder and parameter set-independent machine data:
$MA_
MD30300 IS_ROT_AX
MD31010 ENC_GRID_POINT_DIST
MD31030 LEADSCREW_PITCH
MD31064 DRIVE_AX_RATIO2_DENOM
MD31066 DRIVE_AX_RATIO2_NUMERA
Encoder-dependent machine data: $MA_
MD31000 ENC_IS_LINEAR[ n ]
MD31020 ENC_RESOL[ n ]
MD31025 ENC_PULSE_MULT[ n ]
MD31040 ENC_IS_DIRECT[ n ]
MD31044 ENC_IS_DIRECT2[ n ]
MD31070 DRIVE_ENC_RATIO_DENOM[ n ]
MD31080 DRIVE_ENC_RATIO_NUMERA[ n ]
n: Encoder index, with n = 0, 1, ... (1st encoder, 2nd encoder, etc.)
Parameter-set-dependent machine data: $MA_
MD31050 $MA_DRIVE_AX_RATIO_DENOM[ m ]
MD31060 $MA_DRIVE_AX_RATIO_NUMERA[ m ]
m: Parameter set index, with m = 0, 1, ... (1st parameter set, 2nd parameter set, etc.)
Parameterizing the computational resolution
The ratio of control-internal computational resolution to the actual-value resolution is an
indication of how exactly the values calculated by the control system can be implemented on
the machine.
Computational resolution: Linear axes
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Meaning
Axis is a rotary axis / spindle
Distance between reference marks of the
linear scale
Leadscrew pitch
Denominator of attached gearbox
Numerator of attached gearbox
Meaning
Measuring system is a linear scale
Encoder pulses per revolution
Encoder multiplication (high resolution)
Direct or indirect measuring system
Encoders installed at the attached gearbox
Measuring gearbox denominator
Measuring gearbox numerator
Meaning
Denominator load gearbox
Numerator load gearbox
Function Manual, 06/2019, A5E47437747B AA
Axes and spindles