HEIDENHAIN PROFINET - Manual (Page 78)

Functional description of the encoder
78
G1_XIST1 Preset control = Disabled
With the parameter G1_XIST1 disabled, and if the position value
increases or decreases outside the maximum value or below 0,
the device will output the maximum position value within the
scaled total range for the position value G1_XIST2. The position
value G1_XIST1 is not limited to the scaled total range. For the
position value G1_XIST1, the device will continue to output a
scaled position value within the encoder’s total measuring range
(up to 33554432 positions for a 25 bit encoder).
Example of non-cyclic scaling with G1_XIST1 Preset control
disabled:
Measuring units per revolution = 100
Total measuring range = 5000
(number of revolutions 50)
Figure 38 Non cyclic operation, preset control disabled