Delta DVP-20PM

5 Applied Instructions and Basic Usage
5.10.10 Returning Home
1. Motion control function block
The motion control function block T-HomeReturn is used to start motion of returning home. The value of
the Axis input pin indicates an axis number, and the value of the Direction input pin indicates whether
the axis specified returns home in the positive direction or in the negative direction. The value of the
VRT input pin indicates the speed at which the axis specified returns home. The value of the DogEdge
input pin indicates whether motion is triggered by a transition in DOG’s signal from low to high or from
high to low. The value of the VCR input pin indicates the speed to which the speed of the axis specified
decreases. The value of the Signal_N input pin is the number of zero pulses. The value of the
Distance_P is the number of supplementary pulses needed. After motion of returning home is complete,
the value of the HomePosition input pin will be taken as the present position of the axis specified.
Motion of returning home is shown below.
Limit switch
Direction in which the axis
specified returns home
Home
Limit switch
LSN DOG
LSP
[4]
[3]
[2]
[1]
Position (1): Position [1] is at the right side of the home and DOG, and DOG is OFF.
Position (2): Position [2] is at the right side of the home, and DOG is ON.
Position (3): Position [3] is at the left side of the home and DOG. DOG is OFF, and LSN is OFF.
Position (4): Position [4] is at the left side of the home and DOG. DOG is OFF, and LSN is ON.
2. Input pins/Output pins
Input pin
Name Function
Data
type
Setting value Time when a value is valid
Axis
Motion axis
number
WORD
DVP20PM00D:
K1~K2
DVP20PM00M:
K1~K3
The value of the Axis input pin is valid
when there is a transition in the
Execute input pin’s signal from low to
high.
Execute
Motion is
started when
there is a
transition in the
Execute input
pin’s signal
from low to
high.
BOOL True/False -
DVP-20PM Application Manual
5-181