HEIDENHAIN PROFINET - Manual (Page 75)

Functional description of the encoder
75
7.8.2 Total measuring range
This parameter sets the total measuring range of the encoder. The
total measuring range is calculated by multiplying the single turn
resolution with the number of distinguishable revolutions.
Example:
The total measuring range for a 25 bit multi turn encoder with a 13
bit single turn and a 12 bit multi turn resolution is between 2 0 and
2 25 (33 554 432).
The total measuring range is calculated as below:
Measuring units per revolution x Total measuring range
= 8192 (2 13 ) x 4096 (2 12 )
= 33554432
If the total measuring range is higher than 31 bit, telegram 84 and
acyclic encoder parameter 65002 and 65003 must be used. In
this case the 64 bit values are used and the 32 bit values are set
to zero (0) by the encoder.
The device has two different operating modes, depending on the
specified measuring range. When the device receives a parame-
ter message, it checks the scaling parameters if a binary scaling
can be used. If binary scaling can be used, the device selects op-
erating mode A (see following explanation). If not, operating mode
B is selected.