Detailed description
2.7 Referencing by means of actual value adjustment
Basic logic functions: Reference Point Approach (R1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
49
2.7.3 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 if the following conditions are met:
1. Active measuring system: indirect measuring system (motor measuring system) with
absolute encoder, for example
2. Passive measuring system: Direct measuring system with distancecoded reference
marks
3. Travel movement 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. This automatically references the passive direct measuring
system.
Parameterization
In addition to the specific machine data required to reference the individual measuring
systems, the following machine data must be set:
• Enable actual value adjustment:
MD34102 $MA_REFP_SYNC_ENCS = 1
• Direct measuring system with distancecoded reference marks:
– MD34200 $MA_ENC_REFP_MODE[
measuring system
] = 3
Distancecoded reference marks
– MD30242 $MA_ENC_IS_INDEPENDENT[
measuring system
] = 2
During actual value adjustment, the passive direct measuring system is adjusted to
the actual position of the active indirect measuring system, but is not marked as
referenced. After the parameterized number of reference marks have been crossed,
the passive direct measuring system is automatically referenced. Referencing is
performed in every operating mode.
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