HEIDENHAIN PROFIBUS-DP (DPV2) - Manual (Page 75)

Functionality in the PROFIBUS DPV2 device
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The devices have 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 2X 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 * 2X (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
Number of revolutions= 32(=25=2x2x2x2x2)
(32 equals 25 means that a binary scaling will be used)
Total measuring range = 1000 x 32 =32000
Figure 22 Cyclic scaling