Detailed Description
2.7 Referencing by means of actual value adjustment
Reference Point Approach (R1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
2-43
Note
Reference point distance greater than zero
To ensure reliable backlash recovery, the assigned value for the reference point distance
must be greater than the maximum backlash of both measuring systems.
Reference point distance equal to zero
The reference point distance can also equal zero. In this case, actual value adjustment is
performed without a traversing movement as soon as reference point approach starts. In
this case, the active backlash should be less than half the increment of the measuring
system whose actual value is taken.
2.7.3 Actual value adjustment for measuring systems with distance-coded reference
marks
Functionality
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
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