Rockwell Automation 1746-HSRV SLC Servo Control Module User Manual - Manual (Page 114)

Publication 1746-6.1.2 - July 2000
Setting Up Your SLC Servo Module 7-35
If the current axis position is x, then the following occurs:
•
The axis moves one revolution of the feedback device in the
direction and at a speed that is specified by the Home Axis
command (i.e., toward Marker #2 for this example).
•
Marker #2 is found during the move, and because Final Move to
Marker? is set to Yes (1), the axis moves at the absolute value of
the speed specified by the configured Speed/Direction of Move to
the Marker to the marker closest to the start position (i.e.,
Marker #1).
•
The current position of the axis is set to the configured Home
Position + Home Calibration.
Option 3 Example
When the parameters are set, the axis moves one revolution of the
feedback device in the direction and at the speed that the Home Axis
command specifies when looking for the marker, and then it stops.
EXAMPLE
Marker #1 Current PositionMarker #2
– . . . . | . . . . . . . . . . .x . . . . . . . . . . . . . . . . . . . . . . . . . | . . . . +
Parameters: Equals:
Final Move to Which Marker? 1
Final Move to Marker? No (0)
If the marker is: Then:
Found during that one
revolution move The current position of the axis is set to the
configured
Home Position ± the distance to the nearest
marker + Home Calibration.
Not found during that one
move The problem is reported to the SLC processor.
IMPORTANT
This configuration is typical for a unidirectional axis
(i.e., axis that only moves in one direction).