HEIDENHAIN PROFIBUS-DP (DPV0) - Manual (Page 37)

Encoder and Gateway functionality, DPV0
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5.4.6 Total measuring range (units)
The total measuring range is defined by the parameter “Total
measuring range in measuring units.” The device has two
different operating modes, depending on the specified measuring
range. When the device receives a parameter message, it checks
the scaling parameters if a binary scaling can be used. If binary
scaling can be used, the device selects operating mode A (see
following explanation). If not, operating mode B is selected.
A. Cyclic operation (Binary scaling)
Cyclic operation is used when operating with 2
x number of turns
(2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048. 4096.. number of
turns). If the desired total measuring range is equal to the
specified single turn resolution * 2 x (where x<= 12) the encoder
operates in endless cyclic operation (0 - max - 0 -max..). If the
position value increases above the maximum value by rotating the
encoder shaft, the encoder continues from 0.
Example of a cyclic scaling:
Total measuring range = Measuring units per revolution x number
of revolutions
Measuring units per revolution = 1000
Total measuring range = 32000 (2 5 = number of revolution 32)
Figure 14 Cyclic scaling