Rockwell Automation 1784-PM16SE SoftLogix Motion Card Setup and Configuration Manual - Manual (Page 305)

Publication 1784-UM003A-EN-P – June 2003
Motion Object Attributes 297
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 Home Offset is non-zero, then the Home Position will be offset
from the point where the switch 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 Home Offset is non-zero, then the
Home Position will be offset from the point where the switch is detected by
this value.
Home Configuration Bits
Home Switch Normally Closed
The Home Switch Normally Closed bit attribute determines the normal state
of the home limit switch used by the homing sequence. The normal state of
the switch is its state prior to being engaged by the axis during the homing
sequence. For example, if the Home Switch Normally Closed bit is set (true)
then the condition of the switch prior to homing is closed. When the switch is
engaged by the axis during the homing sequence, the switch is opened, which
constitutes a homing event.
Home Position The Home Position is the desired absolute position for the axis after the
specified homing sequence has been completed. After an active homing
sequence has completed, the axis is left at the specified Home Position.
GSV/SSV Access Attribute Name Data Type Values
SSV/GSV Home Configuration Bits DINT 0: (Reserved)
1: Home Switch Normally Closed
2: (Reserved)
3-31: Reserved
GSV/SSV Access Attribute Name Data Type Values
SSV/GSV Home Position REAL Position Units