when touched rising edge of origin signal.
Return the origin in forward direction, no close signal:
If the origin signal is long:
VH
Limit
origin
If the origin signal is short:
limit
origin
Motion description: the motor returned origin with VH speed, it touched the rising edge of origin
signal and the speed become 0 and returned origin in reverse direction with creeping speed, it
touched the falling edge of origin signal and stop returning.
Return origin point in forward direction, there is close signal:
If the origin signal is long: