SMC Networks LECSN-T Series - 20.8.6 Touch probe

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20．PROFINET COMMUNICATION
20.8.6 Touch probe
POINT
Touch probe cannot be used in the indexer method.
The touch probe function that executes current position latch by sensor input can be used.
With this function, the position feedback of the rising edge and falling edge of TPR1 (touch probe 1) and
TPR2 (touch probe 2) or the position feedback of the encoder zero point passing can be memorized and
stored into each object of P24762 to P24765 according to the conditions specified in Touch probe function
(P24760).
The following shows the touch probe detection resolution. Enabling the high precision touch probe will disable
the encoder output pulses.
Touch probe1
Touch probe2
Input terminal
TPR1
TPR2
Encoder
resolution
[Pr. PD37] = _ _ _ 0 (Selection of high-precision touch probe
is disabled)
55 μs
55 μs
[Pr. PD37] = _ _ _ 1 (Selection of high-precision touch probe
is enabled)
55 μs
Rising: 2 µs
Falling: 55 µs
(1) Related PROFIdrive parameters
PNU
Sub
Access
Name
Type
Default
value
Description
24760
0
R/W
Touch probe function
Unsigned16
Settings such as enabling/disabling of the
touch probe function and trigger conditions
24761
0
R
Touch probe status
Unsigned16
0
Status information of the touch probe function
24762
0
R
Touch probe pos1 pos value
Integer32
0
Shows the rising edge position of Touch
probe 1.
(Pos units)
24763
0
R
Touch probe pos1 neg
value
Integer32
0
Shows the falling edge position of Touch
probe 1.
(Pos units)
24764
0
R
Touch probe pos2 pos value
Integer32
0
Shows the rising edge position of Touch
probe 2.
(Pos units)
24765
0
R
Touch probe pos2 neg
value
Integer32
0
Shows the falling edge position of Touch
probe 2.
(Pos units)