Danfoss MCO 305 Design Manual page 18

MCO 305 Design Guide
__ Functions and Examples __
Relative Positioning
Relative positioning is always relating to the actual position, it is therefore possible to execute a positioning
procedure without defining the absolute zero point.
If the starting position is 100.000, with a relative positioning to 150.000 the target position is 250.000
(100.000 + 150.000), the moving distance is thus 150.000.
Touch Probe Positioning
With touch probe positioning, the positioning is related to the actual position when the touch probe input is
activated, that means the target position is the position of the touch probe + the positioning distance. Touch
probe positioning is thus relative positioning relating to a touch probe instead of the actual starting position.
The touch probe is a sensing device; it can be a mechanical switch, a proximity sensor, an optical sensor or
the like. Once the touch probe is activated, for example by a box moved on a conveyor belt, the reference
for the positioning is set.
With touch probe positioning to position 50.000 the drive is running until the touch probe is activated for
example at position 200.000 and it continues to a target position of 250.000 (200.000 + 50.000). Touch
probe positioning is also called "marker related positioning".
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