IAI America SCON-C - Manual (Page 170)

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3.1.3 Home Return Signal (HOME)
This command signal is used to implement automatic home return.
When the HOME signal is turned ON, the command will be processed at the leading edge (ON edge) of the
signal and the actuator will perform home return operation automatically.
Once the home return is completed, the HEND (home return completion) output signal will turn ON.
Program a sequence so that the home will be set (“0” will be entered) in the current value register of the host
controller (PLC) using the current-value preset function, etc., when the HOME signal turns ON.
* This signal is always enabled while the servo is ON.
* Even after home return has been completed once, the actuator will perform home return again every time the
HOME signal is turned ON.
Caution:
 The HOME signal is given priority over any pulse-train command. Even when the actuator is
moving with a pulse-train command, it will start home return once the HOME signal is turned ON.
 The HOME signal is processed only at the leading edge (ON edge) of the signal.
 If the SON signal is turned OFF or an alarm is detected during home return, the home return
operation will stop. If the servo is turned OFF, the home return command will be cancelled even
when the HOME signal remains ON. To perform home return again, therefore, turn the HOME
signal OFF and then turn it ON again.
 The actuator can be operated without using this function. If this function is not used, however,
management of position data will solely be dependent on the host controller.
In this case, take the necessary measures to prevent an over-stroke, such as not sending pulse
commands with travel distances exceeding the effective stroke or providing external limit switches,
etc., to forcibly stop the actuator upon reaching the stroke ends.