User manual

Publication 1768-UM001C-EN-P - November 2007
Develop Motion Applications 97
a. From the Positioning Mode pull-down menu, choose between the
axis as either rotary or linear.
b. In the Conversion Constant box, specify the number of drive
feedback counts per rotary or linear revolution.
c. For a rotary axis, in the Position Unwind box, type the number of
feedback counts needed to automatically unwind the axis.
7. Click the Homing tab.
a. From the Sequence pull-down menu, choose one of these types of
homing sequences:
• Immediate
• Switch
• Marker
• Switch-Marker
b. Within Active Home Sequence Group, in the Speed and Return
Speed boxes, type the homing speeds and click OK.
IMPORTANT
For an axis of the data type AXIS_CONSUMED, you cannot edit
this parameter because it is set in and taken from a producing
axis in a Logix processor connected to a network.
• Linear - provides a maximum total linear travel of 1 billion
feedback counts. This mode disables the unwind feature. You can
limit the axis’ linear travel distance by specifying its positive and
negative travel limits.
• Rotary - enables the axis’ rotary unwind feature. This feature
provides infinite position range by unwinding the axis position
whenever the axis moves through a complete unwind distance.
The number of encoder counts per unwind of the axis is specified
by the Position Unwind parameter.