IAI America SCON-C - Manual (Page 125)

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3.2 How Return Operation
3.2.1 Method Using the HOME Input Signal (PIO Pattern = 0 to 4)
Since the home return signal (HOME) is provided in PIO patterns 0 to 4, perform home return using this signal.
 When the home return signal (HOME) turns ON, the actuator starts moving toward the mechanical end on the
home side.
Once the mechanical end is contacted, the actuator reverses its direction and moves, and then stops at the
home position.
 At the start of movement, the position complete output (PEND) turns OFF while the moving output (MOVE)
turns ON.
 When the actuator stops at the home position, the position complete output (PEND) and home return
complete output (HEND) turn ON. On the other hand, the moving output (MOVE) turns OFF.
 On the PLC side, turn OFF the home return signal (HOME) after the home return complete output (HEND)
has turned ON.
With an absolute type controller, home return operation is not a requirement because the home return
completion output (HEND) will turn ON after the power is input to the controller.
Caution: When performing home return, pay attention to the following:
[1] Confirm that no obstacle is present in the home return direction.
[2] If any obstacle is present in the home return direction, review the PLC sequence circuit and
change the circuit so that home return will be executed only when there is no obstacle.
Mechanical
end
Home return input
(HOME)
Home return complete
output (HEND)
Position complete output
(PEND)
Moving output
(MOVE)
Effective in PIO pattern 0 or 1.
Actuator movement
Stops at the
home position.