HEIDENHAIN PROFIBUS-DP (DPV2) - Manual (Page 77)

Functionality in the PROFIBUS DPV2 device
77
G1_XIST1 Preset control = disabled
With the parameter G1_XIST 1 preset control 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_XIST 2. The
position value G1_XIST 1 is not limited to the scaled total range.
For the position value G1_XIST 1, the device will continue to
output a position value within the encoder’s total measuring range
(up to 33554432 positions for a 25 bit encoder)
Example of non-cyclic scaling G1_XIST 1 Preset control
disabled:
Measuring units per revolution = 100
Total measuring range = 5000
(number of revolutions 50)
Figure 24 Non-cyclic scaling G1_XIST 1 Preset control disabled