IAI America SCON-C - Manual (Page 92)

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 Emergency stop status (*EMGS)
This signal remains ON in a normal condition, and will turn OFF if the emergency stop switch is pressed.
Program the PLC so that it will monitor this signal and implement appropriate safety measures for the entire
system if the signal turns OFF.
 Alarm (*ALM)
This signal remains ON while the controller is operating properly, and turns OFF when an alarm has generated.
Provide an appropriate safety measure for the entire system by allowing the PLC to monitor the OFF status of
this signal.
For details of alarms, refer to Appendix 5, “Troubleshooting.”
 Absolute-battery voltage low warning signal (*BALM)
This signal remains ON while the absolute battery voltage is normal when controller is of absolute specification,
or when the controller is of incremental specification. It will turn OFF once the absolute battery voltage drops to
3.1 V. If the voltage drops further to 2.5 V, an alarm will generate and the controller will no longer be able to
retain position information.
As long as the aforementioned alarm is not present, the controller still retains position information and thus
operations can be performed properly even when this signal is OFF.
 Mode status (MODES)
The MODES signal will turn ON when the teaching mode is enabled upon selection of the teaching mode via the
operation mode input signal (MODE signal ON).
Thereafter, the MODES signal will remain ON until the MODE signal turns OFF.
Configure the system in such a way that the PLC will start teaching operation after confirming that the MODES
signal has turned ON.
This signal is enabled only when the PIO pattern is “teaching type.”
 Write completion (WEND)
The WEND signal is OFF immediately after the controller has switched to the teaching mode. It will turn ON
when the writing of position data in response to the current-position write signal is completed.
When the current-position write signal turns OFF, this signal will also turn OFF.
Configure the system in such a way that the PLC will acknowledge completion of writing when the WEND signal
turns OFF.
This signal is enabled only when the PIO pattern is “teaching type” and the actuator is currently operating in the
teaching mode.