Function library
7-80
L
EDSVS9332P-D21 EN 3.0
7.5.13.4 Touch probe positioning
Purpose
•
Positioning depending on an external digital terminal signal (TP positioning).
•
E. g.: The front edge of workpieces of different lengths is always to be positioned at the same
place.
VTVEL: Traversing speed
+ VTA CC: Acceleration
- VTACC: Deceleration
C1312: PS target position
C1331: TP residual distance
9300POS034a
v
v
t
t
T o u c h P r o b e
T o u c h P r o b e
V T V E L
+ V T A C C
+ V T A C C
- V T A C C
- V T A C C
T a r g e t p o s i t i o n
T o u c h P r o b e - r e s i d u a l d i s t a n c e
V T V E L
Fig. 7-37 Speed profile of a TP positioning
Function
•
PS mode (C1311): Select 6...14 (“Absolute PS”, “Relative PS”,TP).
•
TP positioning corresponds to a point-to-point positioning with / without velocity changeover.
One of the four possible touch probe inputs (terminals X5/E1 ... X5/E4) is enabled during
positioning.
•
If TP occurs, the actual position value is saved as TP position and the target position of the
current positioning is changed.
Calculation of the new target position when TP occurs
TP position + TP residual distance
– The value of the TP residual distance is always added to the value of the TP position.
– The direction of the TP residual distance always corresponds to the traversing direction
when TP occurs.
•
The actual position value saving via TP is interrupt-controlled and has a very short reaction
time:
– rising edge at terminal: <0.010 ms
– falling edge at terminal: <0.100 ms
•
The TP input can be enabled for the entire TP positioning process or for parts of it. Target
position, TP residual distance and TP window determine the restricted area (fig. 7-37).
Tip!
•
The TP position values saved are available in VTPOS-OUT-101 to -104 for further function
block interconnections.
•
The function “Touch-probe saving of the actual position value” via the function block inputs
“POS-TPx-ENABL” is a separate function (see POS-TP). TP positioning has priority over
“To u c h - p r o b e s a v i n g ”.
To Next Page
Loading...
