Rockwell Automation 1784-PM16SE SoftLogix Motion Card Setup and Configuration Manual - Manual (Page 123)

Publication 1784-UM003A-EN-P – June 2003
Naming & Configuring Your Motion Axis 115
Mode
Select the homing mode:
• Active: In this mode, the desired homing sequence is selected by
specifying whether a home limit switch and/or the encoder marker is
used for this axis. Active homing sequences always use the trapezoidal
velocity profile.
• Passive: In this mode, homing redefines the absolute position of the
axis on the occurrence of a home switch or encoder marker event.
Passive homing is most commonly used to calibrate uncontrolled axes,
although it can also be used with controlled axes to create a custom
homing sequence. Passive homing, for a given home sequence, works
similar to the corresponding active homing sequence, except that no
motion is commanded; the controller just waits for the switch and
marker events to occur.
• Absolute: (AXIS_SERVO_DRIVE only) In this mode, the absolute
homing process establishes the true absolute position of the axis by
applying the configured Home Position to the reported position of the
absolute feedback device. The only valid Home Sequence for an
absolute Homing Mode is immediate.
Position
Type the desired absolute position, in position units, for the axis after the
specified homing sequence has been completed. In most cases, this position is
set to zero, although any value within the software travel limits can be used.
After the homing sequence is complete, the axis is left in this position.
If the Positioning Mode (set in the Conversion tab) of the axis is Linear, then
the home position should be within the travel limits, if enabled. If the
Positioning Mode is Rotary, then the home position should be less than the
unwind distance in position units.
Offset
Type the desired offset (if any) in position units the axis is to move, upon
completion of the homing sequence, to reach the home position. In most
cases, this value is zero.