July 2013 6.1 Control loops 607
HEIDENHAIN offers incremental linear encoders with distance-coded
reference marks. The nominal increment between two fixed reference marks
depends on the encoder being used:
In MP334.x, enter for each axis the nominal increments between two fixed
reference marks.
If the number of grating periods between the reference end position and the
first reference mark exceeds the value from MP334.x, the error message Ref
mark <axis>: incorrect spacing appears. This monitoring is turned off with
MP334.x = 0.
Example:
LS 486C:
Incremental linear encoder with distance-coded reference marks, grating
period 20 µm (= one signal period covers 0.02 mm), nominal increment
between reference marks is 20 mm.
MP331.x = 0.02
MP332.x = 1
MP334.x = =1000 (or 0)
MP331.x Distance for the number of signal periods in MP332
Input: 0.0001 to +1.797693135E+308 [mm] or [°]
MP332.x Number of signal periods for the distance in MP331
Input: 1 to +1.797693135E+308
MP334.x Nominal increment between two fixed reference marks on
encoders with distance-coded reference marks
Input: 1 to 65 535
0: 1000
External
interpolation
If you connect encoders with TTL signals and an external interpolation unit
through the TTL/1 V
PP
adapter to the control:
In MP340.x, enter the interpolation factor of the external interpolation unit.
MP340.x Interpolation factor for external interpolation
Input: 0 to 99
0 = 1: No external interpolation
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