Siemens SINUMERIK 840Di - 2.3.7 Adjustments to actual-value resolution

Detailed Description
2.3 Setpoint/actual-value system
Velocities, Setpoint/Actual-Value Systems, Closed-Loop Control (G2)
2-42 Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
For the following machine data, the control does not consider any parameter set nor any
indices for coded encoders.
NewConfig-dependent machine data Meaning
MD31064 $MA_DRIVE_AX_RATIO2_DENOM (Intermediate gear denominator)
MD31066 $MA_DRIVE_AX_RATIO2_NUMERA (Intermediate gear numerator)
MD31044 $MA_ENC_IS_DIRECT2 (Encoder on intermediate gear)
MD32000 $MA_MAX_AX_VELO (Maximum axis velocity)
MD34080 $MA_REFP_MOVE_DIST (Reference point distance)
MD34090 $MA_REFP_MOVE_DIST_CORR (Reference point offset)
Note
These machine data can be activated in parts programs with the command NEWCONF or via
the HMI operator panel using a soft key.
Variants of actual-value acquisition
The relevant machine data and relational calculations for the different methods of actual-
value acquisition are described in the following.
2.3.7 Adjustments to actual-value resolution
Calculating the ratio
The calculation of the ratio is obtained from the associated machine data and is defined for
incremental encoders as follows:
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For incremental encoders with rotary axis, the following applies:
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The internal pulse multiplication factor provided by the measuring system logic module is
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