Touch Probe; Overview Of Touch Probe - Danfoss iC7 Motion Series Application Manual

Application Guide | iC7 Series Motion

Touch Probe

2.12.5

Overview of Touch Probe

2.12.5.1
The Touch probe function captures the actual position at the edge of a signal on a digital input, independent of the operating mode.
2 simultaneous touch probes are supported, called Touch Probe 1 (menu group 5.18.1) and Touch Probe 2 (menu group 5.18.2). The
following describes Touch probe 1 but is applicable to both as the two touch probes and their parameters are identical, the only
difference being level 3 of the parameter index number.
The source of the touch probe signal is selected with parameter 5.18.1.2.1 Touch Probe 1 Input and it is possible to enable and disable
monitoring of the touch probe by a digital input or a fieldbus control word bit, selected with parameter 5.18.1.2.2 Touch Probe 1 Enable
Input.
There are 2 modes for capturing the touch probe position selected via parameter 5.18.1.2.5 Touch Probe 1 Mode:
Selection
Single Shot
Continuous
The captured touch probe positions can be read out and used by an external controller, while they can be used inside the drive for Touch
probe positioning, distance measurement, and marker synchronizing.
It is possible to define a position window for accepting the touch probe by defining first and last positions for the acceptable position
area with parameters 5.18.1.2.7 Touch Probe 1 First Position and 5.18.1.2.8 Touch Probe 1 Last Position. The following illustrations show
different scenarios for linear and rotary axis:
FirstPosition < LastPosition
accepted
MinPosition FirstPosition
FirstPosition > LastPosition
accepted
MinPosition MinPosition LastPosition
Figure 18: Touch Probe Scenarios for Linear and Rotary Axis
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Description
After the touch probe is enabled, only the first occurrence of the touch probe is captured. The
actual position at the occurrence of the touch probe is shown in parameter 5.18.1.1.5 Touch Probe 1
Recorded Position.
All occurrences of the touch probe are captured while the touch probe is enabled. The actual
position at the latest occurrence of the touch probe is shown in parameter 5.18.1.1.5 Touch Probe 1
Recorded Position. The number of occurrences is counted and shown in parameter 5.18.1.1.7 Touch
Probe 1 Counter. The counter is automatically reset when the touch probe is enabled, but it can also
be reset at any time by parameter 5.18.1.2.4 Touch Probe 1 Reset Counter.
LastPosition MaxPosition
accepted
FirstPosition MaxPosition
FirstPosition < LastPosition
- +
0
LastPosition LastPosition
accepted
FirstPosition
FirstPosition > LastPosition
- +
0
FirstPosition
FirstPosition
accepted
accepted
LastPosition
- +
0
FirstPosition
accepted
- +
0
LastPosition
accepted
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