Rockwell Automation 1784-PM16SE SoftLogix Motion Card Setup and Configuration Manual - Manual (Page 121)

Publication 1784-UM003A-EN-P – June 2003
Naming & Configuring Your Motion Axis 113
Positioning Mode
This parameter is not editable for an axis of the data type
AXIS_CONSUMED. Instead, this value is set in and taken from a producing
axis in a networked Logix processor. This value can be edited for
AXIS_SERVO, AXIS_SERVO_DRIVE and AXIS_VIRTUAL. The option
are:
• Linear - provides a maximum total linear travel of 1 billion feedback
counts. With this mode, the unwind feature is disabled and you can limit
the linear travel distance traveled by the axis by specifying the positive
and negative travel limits for the axis.
• Rotary - enables the rotary unwind capability of the axis. 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.
Conversion Constant
Type the number of feedback counts per position unit. This conversion – or
“K” – constant allows axis position to be displayed, and motion to be
programmed, in the position units set in the Units tab. The conversion
constant is used to convert axis position units into feedback counts and vice
versa for the AXIS_SERVO type and for the AXIS_SERVO_DRIVE, the
number of counts per motor revolution, as set in the Drive Resolution field of
the Drive tab.
Position Unwind
This parameter is not editable for an axis of the data type
AXIS_CONSUMED. Instead, this value is set in and taken from a producing
axis in a networked Logix processor. For a Rotary axis (AXIS_SERVO), this
value represents the distance (in feedback counts) used to perform automatic
electronic unwind. Electronic unwind allows infinite position range for rotary
axes by subtracting the unwind distance from both the actual and command
position, every time the axis travels the unwind distance.