User manual

Rockwell Automation Publication MOTION-UM003F-EN-P - March 2015 181
Home an Axis Chapter 8
Passive Homing
These examples show different ways to use passive homing.
Table 23 - Passive Homing Examples
Sequence Description
Passive Immediate Home This is the simplest passive homing sequence type. When this sequence is performed,
the controller immediately assigns the Home Position to the current axis actual
position. This homing sequence produces no axis motion.
Passive Home with Switch This passive homing sequence is useful for when an encoder marker is not available or a
proximity switch is being used.
When this sequence is performed in the Passive Homing mode, an external agent
moves the axis until the home switch is detected. The Home Position is assigned to the
axis position at the moment that the limit switch is detected. If you are using a Home
Offset, then the Home Position is offset from the point where the switch is detected by
this value.
Passive Home with Marker This passive homing sequence is useful for single-turn rotary and linear encoder
applications.
When this sequence is performed in the Passive Homing mode, an external agent
moves the axis until the marker is detected. The home position is assigned to the axis
position at the precise position where the marker was detected. If you are using a Home
Offset, then the Home Position is offset from the point where the marker is detected by
this value.
Passive Home with Switch
then Marker
This passive homing sequence is useful for multi-turn rotary applications.
When this sequence is performed in the Passive Homing mode, an external agent
moves the axis until the home switch and then the first encoder marker is detected. The
home position is assigned to the axis position at the precise position where the marker
was detected. If you are using a Home Offset, then the Home Position is offset from the
point where the marker is detected by this value.