HEIDENHAIN PROFINET - Manual (Page 77)

Functional description of the encoder
77
B. Non-cyclic operation
If the desired total measuring range is not equal to the specified
single turn resolution * 2 X (where x<= 12) the encoder operates
in non-cyclic operation. The non-cyclic operation is affected by the
parameter G1_XIST1 Preset control as described below.
G1_XIST1 Preset control = Enabled
If the position value increases or decreases outside the maximum
value or below 0 with the parameter G1_XIST1 Preset control en-
abled , the device outputs the maximum position value within the
scaled total range for both position values G1_XIST1 and
G1_XIST2.
Example of non-cyclic scaling with G1_XIST1 Preset control
enabled:
Measuring units per revolution = 100
Total measuring range = 5000
(number of revolutions 50)
Figure 37 Non cyclic operation, preset control enabled