Actual Value Adjustment For Measuring Systems With Distance-Coded Reference Marks - Siemens SINUMERIK 840D Function Manual

10.7.2 Actual value adjustment for measuring systems with distance-coded reference
marks
Function
In order to improve positioning precision by determining the measuring-system-specific
encoder fine information, we recommend explicitly re-referencing the measuring system
previously referenced by actual value adjustment after switching over the measuring system.
If an encoder with distance-coded reference marks is used for the passive measuring system,
referencing can be avoided under the following conditions:
1. Active measuring system: Indirect measuring system (motor measuring system) with
absolute encoder, for example
2. Passive measuring system: Direct measuring system with distance-coded reference marks
3. Traversing motion of the machine axis with the referenced indirect measuring system before
measuring system switchover in which the number of reference marks required for
referencing are crossed. Whereby, the passive direct measuring system is referenced
automatically.
Parameterization
In addition to the specific machine data required to reference the individual measuring systems,
the following machine data must be set:
● Enable the actual value adjustment:
MD34102 $MA_REFP_SYNC_ENCS = 1
● Direct measuring system with distance-coded reference marks:
– MD34200 $MA_ENC_REFP_MODE[
– MD30242 $MA_ENC_IS_INDEPENDENT[
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
Distance-coded reference marks
In the actual value adjustment, the passive direct measuring system is aligned to the
actual position of the active indirect measuring system, but not marked as referenced.
After the parameterized number of reference marks is crossed, the passive direct
measuring system is referenced automatically. Referencing is performed in every
operating mode.
10.7 Referencing by means of actual value adjustment
measuring system ] = 3
measuring system ] = 2
R1: Referencing
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