Siemens SINUMERIK 840Di Function Manual page 416

Detailed Description
2.3 Setpoint/actual-value system
For the following machine data, the control does not consider any parameter set nor any
indices for coded encoders.
NewConfig-dependent machine data
MD31064 $MA_DRIVE_AX_RATIO2_DENOM
MD31066 $MA_DRIVE_AX_RATIO2_NUMERA
MD31044 $MA_ENC_IS_DIRECT2
MD32000 $MA_MAX_AX_VELO
MD34080 $MA_REFP_MOVE_DIST
MD34090 $MA_REFP_MOVE_DIST_CORR
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:
For incremental encoders with rotary axis, the following applies:
The internal pulse multiplication factor provided by the measuring system logic module is
• 2048
2-42
Meaning
(Intermediate gear denominator)
(Intermediate gear numerator)
(Encoder on intermediate gear)
(Maximum axis velocity)
(Reference point distance)
(Reference point offset)
Velocities, Setpoint/Actual-Value Systems, Closed-Loop Control (G2)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0