IAI America SCON-C - Manual (Page 119)

101
[2] On absolute reset from PIO (supported from version V001E)
It is possible to use PIO to perform absolute reset.
Execute the following steps [1] to [3] in order to perform absolute reset.
[1] Shift the controller to a status where absolute reset is possible.
[1] Check that the SV signal is OFF.
[2] Turn the SON signal OFF for 100 ms or longer.
(Turn the SV and SON signals OFF and continue this status for 100 ms or longer.)
[3] Turn the HOME signal (ST0 signal in case of PIO pattern 5) from OFF to ON (ON edge).
[2] Cancel errors related to absolute.
[1] In the status of [1], turn the RES signal from OFF to ON (ON edge).
[2] Check that the *ALM signal is turned ON (controller’s alarm * is cancelled).
* If the cause of an error is not removed, an alarm will be present again (XALM signal OFF).
[3] Turn the HOME (ST0 signal in case of PIO pattern 5) and RES signals OFF.
[3] Perform absolute reset.
[1] Turn the SON signal ON.
[2] Wait until the SV signal turns ON.
[3] Turn the HOME signal (ST0 signal in case of PIO pattern 5) ON (ON edge). The home return operation
is started.
[4] When the HEND signal is turned ON (completion of home return), absolute reset is completed.
The following diagram shows the timing chart of absolute reset from PIO.
100 ms or longer
Output signal from PLC
Input signal to PLC
Alarm reset command
Servo ON wait
Home return command
Home return
complete
(Absolute reset
complete)