Siemens SINUMERIK 840D sl Function Manual page 349

Parameterizing the actual value resolution depending on the axis type (linear/rotary axis)
The control system calculates the actual value resolution based on the following machine data.
Machine data for calculating the actual value resolution
MD30300 $MA_IS_ROT_AX
MD31000 $MA_ENC_IS_LINEAR[ n ]
MD31010 $MA_ENC_GRID_POINT_DIST[ n ]
MD34320 $MA_ENC_INVERS[ n ]
MD31020 $MA_ENC_RESOL[ n ]
MD31025 $MA_ENC_PULSE_MULT[ n ]
MD31030 $MA_LEADSCREW_PITCH
MD31040 $MA_ENC_IS_DIRECT[ n ]
MD31044 $MA_ENC_IS_DIRECT2[ n ]
MD31050 $MA_DRIVE_AX_RATIO_DENOM[ n ]
MD31060 $MA_DRIVE_AX_RATIO_NUMERA[ n ]
MD31070 $MA_DRIVE_ENC_RATIO_DENOM[ n ]
MD31080 $MA_DRIVE_ENC_RATIO_NUMERA[ n ]
-
1) For distance-coded measuring systems
2) These machine data are not required for encoder matching (path evaluation). However,
3) The encoder on the motor side is a built-in encoder and, therefore, does not have a
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
G2: Velocities, setpoint / actual value systems, closed-loop control
Not relevant
they must be entered correctly for the setpoint calculation! Otherwise the required servo
gain factor (K ) will not be set. The load revolutions are entered into machine data
V
MD31050 $MA_DRIVE_AX_RATIO_DENOM and the motor revolutions in machine data
MD31060 $MA_DRIVE_AX_RATIO_NUMERA.
measuring gear unit.
The transmission ratio is always 1:1.
Linear axis
Linear scale / Indirect
direct measuring measur‐
system ing system
0 0
1 0
Spacing -
-
1)
- Pulses/
rev
Encoder multipli‐
cation
- mm/rev.
- / 1 0
- / 1 0
- Load
rev.
- Motor
rev. if in‐
feed
gear avail‐
able
- Encoder
rev.
- Motor-
side en‐
coder
7.4 Setpoint/actual-value system
Linear axis Rotary axis
Direct Indirect
measuring measur‐
system: ing sys‐
Machine/ tem
tool
0 1
0 0
- -
- -
Pulses/ Pulses/
rev rev
mm/rev. -
1 0
1 0
- / 1 Load
rev.
- / 1 Motor
rev.
Encoder Encoder
rev. rev.
Motor Motor
rev. rev.
3)
Direct
measur‐
ing sys‐
tem: Ma‐
chine/tool
1
0
-
-
Pulses/
rev
-
1
1
2)
2)
Encoder
rev.
Load
rev.
349